Phénomènes climatiques en direct

[paix 0]

Toujours aussi intéressant Piet

[Boitsfort 0]

Regardez comme les averses (en cellules convectives ouvertes dans ce cas) se limitent à la mer du Nord en évitant l'intérieur des terres des îles Britanniques.

Normal, l'instabilité et la convection naissent du contraste en l'air froid et une surface nettement plus chaude. A cette saison en matinée, seules les surfaces marines sont assez chaudes pour générer ces nuages convectifs qui peuvent évidement un peu déborder dans les terres, voire s'y former mais uniquement après réchauffement diurne suffisant.

A noter qu'au printemps ou en été, les contrastes sont tels que, à l'inverse, les nuages convectifs se forment plus facilement dans les terres l'après-midi qu'en mer.

On a eu le droit à un coup de tonnerre ici à Boitsfort , on voyait clairement que la tropopause était basse , car l'enclume des cumulo-nimbus était rapidement atteinte ... ( +-6-7 km de haut )

[Brad 0]

et pendant ce temps, la région des grands lacs (Michigan) subit une fameuse tempête.

DHnet.be

pour illustrer: la carte de pression de ce matin (GFS): 965Hpa au plus creux, ca doit faire mal...

si qqun a des infos sur la "genèse" du péhnomène, ca m'intéresse

[paix 0]

Et même un record à 955 hPa

Jeff Masters nous donne même en référence les 892 hPa de l'ouragan du Jour du Travail de 1932. Megi où est-tu ?

http://www.wunderground.com/blog/JeffMasters/show.html

Tornadoes, violent thunderstorms, and torrential rains swept through a large portion of the nation's midsection yesterday, thanks to the strongest storm ever recorded in the Midwest. NOAA's Storm Prediction Center logged 24 tornado reports and 282 reports of damaging high winds from yesterday's spectacular storm, and the storm continues to produce a wide variety of wild weather, with tornado watches posted for Mississippi, Alabama, and Georgia, a blizzard warning for North Dakota, high wind warnings for most of the upper Midwest, and near-hurricane force winds on Lake Superior.

The mega-storm reached peak intensity late yesterday afternoon over Minnesota, resulting in the lowest barometric pressure readings ever recorded in the continental United States, except for from hurricanes and nor'easters affecting the Atlantic seaboard. So far, it appears the lowest reading (not yet official) was a pressure of 28.20" (954.9 mb) reduced to sea level reported from Bigfork, Minnesota at 5:13pm CDT. Other extreme low pressures from Minnesota during yesterday's storm included 28.22" (956 mb) at Orr at 5:34pm CDT, 28.23" at International Falls (3:45pm), and 28.23" at Waskuh at 5:52pm. The 28.23" (956mb) reading from International Falls yesterday obliterated their previous record of 28.70" set on Nov. 11, 1949 by nearly one-half inch of mercury--a truly amazing anomaly. Duluth's 28.36" (961 mb) reading smashed their old record of 28.48" (964 mb) set on Nov. 11, 1998. Wisconsin also recorded its lowest barometric pressure in history yesterday, with a 28.36" (961 mb) reading at Superior. The old record was 28.45" (963.4 mb) at Green Bay on April 3, 1982. The previous state record for Minnesota was 28.43" (963 mb) at Albert Lea and Austin on Nov. 10, 1998.

Figure 1. Visible satellite image of the October 26, 2010 superstorm taken at 5:32pm EDT. At the time, Bigfork, Minnesota was reporting the lowest pressure ever recorded in a U.S. non-coastal storm, 955 mb. Image credit: NASA/GSFC.

Yesterday's records in context

Yesterday's 28.20" (955 mb) low pressure reading in Minnesota breaks not only the 28.28" (958 mb) previous "USA-interior-of-the-continent-record" from Cleveland, Ohio during the Great Ohio Storm of Jan. 26, 1978 (a lower reading in Canada during this event bottomed out at an amazing 28.05"/950 mb), but also the lowest pressure ever measured anywhere in the continental United States aside from the Atlantic Coast. The modern Pacific Coast record is 28.40" (962mb) at Quillayute, Washington on Dec. 1, 1987. An older reading, taken on a ship offshore from the mouth of the Umpqua River in Oregon during the famous "Storm King" event on January 9, 1880, is tied with yesterday's 28.20" (955 mb.)

The lowest non-hurricane barometric pressure reading in the lower 48 states is 28.10" (952 mb) measured at Bridgehampton, New York (Long Island) during an amazing nor'easter on March 1, 1914 (see Kocin and Uccellini, "Northeast Snowstorms; Vol. 2., p. 324, American Meteorological Society, 2004.) The lowest non-hurricane barometric pressure reading from anywhere in the United States was a 27.35" (927 mb) reading at Dutch Harbor, Alaska on Oct. 25, 1977. The lowest hurricane pressure reading was the 26.34" (892 mb) recorded in 1935 during the Great Labor Day Hurricane.

Figure 2. Storm reports received by NOAA's Storm Prediction Center from the October 26, 2010 superstorm.

The six most intense storms in history to affect the Great Lakes

According to the Chicago branch of the National Weather Service and Christopher C. Burt, our Weather Records blogger, the following are the six lowest pressures measured in the U.S. Great Lakes region:

1. Yesterday's October 26, 2010 Superstorm (955 mb/28.20")

2. Great Ohio Blizzard January 26, 1978 (958 mb/28.28")

3. Armistice Day Storm November 11, 1940 (967 mb/28.55")

4. November 10, 1998 storm (967 mb/ 28.55")

5. White Hurricane of November 7 - 9, 1913 (968 mb/28.60")

6. Edmund Fitzgerald Storm of November 10, 1975 (980 mb/28.95")

So, the famed storm that sank the ore carrier Edmund Fitzgerald in 1974, killing all 29 sailors aboard, was weaker than the current storm. Indeed, I wouldn't want to be on a boat in Lake Superior today--sustained winds at the Rock of Ages lighthouse on Isle Royale were a sustained 68 mph, gusting to 78 mph at 3am EDT this morning!

Yet Another Remarkable Mid-latitude Cyclone so far this Year!

Yesterday's superstorm is reminiscent of the amazing low pressures reached earlier this year (Jan. 19-22) in the West, where virtually every site in California, Nevada, Utah, Arizona, southern Oregon, and southern Idaho--about 10 - 15% of the U.S. land area--broke their lowest on record pressure readings. However, the lowest readings from that event fell well short of yesterday's mega-storm with 28.85" (977 mb) being about the lowest recorded at any onshore site.

Commentary

We've now had two remarkable extratropical storms this year in the U.S. that have smashed all-time low pressure records across a large portion of the country. Is this a sign that these type of storms may be getting stronger? Well, there is evidence that wintertime extratropical storms have grown in intensity in the Pacific, Arctic, and Great Lakes in recent decades. I discuss the science in detail in a post I did earlier this year. Here is an excerpt from that post:

General Circulation Models (GCMs) like the ones used in the 2007 IPCC Assessment Report do a very good job simulating how winter storms behave in the current climate, and we can run simulations of the atmosphere with extra greenhouse gases to see how winter storms will behave in the future. The results are very interesting. Global warming is expected to warm the poles more than the equatorial regions. This reduces the difference in temperature between the pole and Equator. Since winter storms form in response to the atmosphere's need to transport heat from the Equator to the poles, this reduced temperature difference reduces the need for winter storms, and thus the models predict fewer storms will form. However, since a warmer world increases the amount of evaporation from the surface and puts more moisture in the air, these future storms drop more precipitation. During the process of creating that precipitation, the water vapor in the storm must condense into liquid or frozen water, liberating "latent heat"--the extra heat that was originally added to the water vapor to evaporate it in the first place. This latent heat intensifies the winter storm, lowering the central pressure and making the winds increase. So, the modeling studies predict a future with fewer total winter storms, but a greater number of intense storms. These intense storms will have more lift, and will thus tend to drop more precipitation--including snow, when we get areas of strong lift in the -15°C preferred snowflake formation region.

Modifié 27 octobre 2010 par paix

[paix 0]

Le calvaire que vit le peuple haïtien est difficile à comparer aux souffrances du peuple pakistanais. Chacun à ses difficultés propres, et il ne peut être établi d'échelle à mon sens dans ce domaine si sensible. Par contre, niveau couverture médiatique, la comparaison se fait sans problèmes. Et là, clairement, Haïti est privilégié. Évidemment, le Pakistan est juste le refuge de barbus prêt à commettre des attentats et autres enlévements.

Pakistan: les millions de déplacés auront besoin d'aide durant deux ans

GENEVE - Les millions de personnes affectées par les inondations historiques qui ont dévasté le Pakistan resteront dépendantes d'une aide humanitaire durant les deux ans à venir, a estimé lundi la Fédération internationale de la Croix-Rouge et du Croissant-Rouge (FICR).

Selon la FICR, trois mois après les inondations sans précédent provoquées par des pluies de mousson torrentielles, la situation reste préoccupante dans l'ensemble du pays.

Dans le nord, la majorité de la population a pu rentrer chez elle pour découvrir des habitations et infrastructures massivement détruites tandis que plus au sud, dans la province du Sind, un million de personnes sont condamnées à rester dans les camps en raison des eaux qui ne baissent pas.

"Même s'ils peuvent retourner chez eux, les sinistrés auront besoin d'une aide humanitaire tout au long des deux prochaines années. Cela vaut non seulement pour le Sind, mais pour tout le pays", a expliqué le coordinateur pour les inondations de la Fédération, Nelson Castano cité dans un communiqué.

De fait, selon la Fédération, 13% de la population au Pakistan est sous-alimentée et ce chiffre devrait augmenter en raison de la précarité persistante des personnes frappées par la catastrophe.

"Nous nous attendons à ce que ce chiffre augmente dans les communautés touchées par les inondations", a ajouté M. Castano.

La FICR relève ainsi que dans le Sind, un million de personnes vivent toujours dans des camps où l'accès à des tentes, de la nourriture et de l'eau potable reste limité.

Dans les autres régions du Penjab et du Khyber Pakhtunkhwa (KPK), la majorité des personnes déplacées sont rentrées chez elles pour découvrir qu'elles n'ont plus rien, avec aucun moyen de subsistance, poursuit la Fédération.

Dans ces régions, "l'hiver approche à grands pas et nous faisons tout ce qui est en notre pouvoir afin que les sinistrés aient des abris décents pour affronter les durs mois à venir", a insisté M. Castano.

Selon l'ONU, les pluies torrentielles qui se sont abattues sur le Nord-Ouest du Pakistan fin juillet, provoquant des inondations tout le long de l'Indus, ont fait 21 millions de sinistrés, dont 7,27 millions sont encore affectés d'une façon ou d'une autre.

(©AFP / 01 novembre 2010 16h22)

http://www.romandie.com/infos/news2/101101...19.xu91zgjc.asp

Inondations au Pakistan: appel de l'UNICEF à des dons pour poursuivre l'aide

Belga | 05 Novembre 2010 21h36

L'UNICEF a lancé, vendredi, un nouvel appel aux dons pour les victimes des inondations provoquées par les pluies torrentielles qui se sont abattues sur le Nord-Ouest du Pakistan fin juillet. L'UNICEF a besoin de 117,2 millions de dollars afin d'être en mesure de poursuivre ses activités humanitaires au Pakistan, indique UNICEF Belgium dans un communiqué.

L'UNICEF n'a reçu jusqu'à présent qu'un peu plus de la moitié (133,9 millions USD sur 251) des fonds dont il a besoin pour venir en aide aux enfants affectés par la catastrophe. Des millions de familles sont toujours dépendantes de l'aide internationale pour survivre, surtout dans le Nord menacé maintenant par les rigueurs de l'hiver avec son cortège d'infections respiratoires. Si elle n'obtient pas davantage de fonds, l'UNICEF devra réduire ses équipes et ses interventions dans les domaines de la santé des enfants, l'éducation, l'eau et l'assainissement ou la protection surtout dans les régions de Multan, Sukkur et Hyderabad. L'organisation onusienne devra aussi suspendre sa campagne nationale de vaccination contre la rougeole et ne pourra assurer l'approvisionnement en eau potable de 1,7 million de personnes - dont 700.000 enfants - que jusqu'au 31 décembre. (MPK)

http://www.rtlinfo.be/info/monde/internati...ursuivre-l-aide

[paix 0]

Après le Pakistan, la Russie, l'Afrique Subsaharienne, ... c'est au tour de la Bolivie de battre des records de températures.

Bolivia tied its all-time hottest temperature mark on October 29, when the mercury hit 46.7°C (116.1°F) at Villamontes. This ties the record set in Villamontes on three other dates: November 9, 2007, November 1980, and December 1980.

The year 2010 now has the most national extreme heat records for a single year--nineteen. These nations comprise 20% of the total land area of Earth. This is the largest area of Earth's surface to experience all-time record high temperatures in any single year in the historical record. Looking back at the past decade, which was the hottest decade in the historical record, seventy-five counties set extreme hottest temperature records (33% of all countries.) For comparison, fifteen countries set extreme coldest temperature records over the past ten years (6% of all countries). My source for extreme weather records is the excellent book Extreme Weather by Chris Burt. His new updates (not yet published) remove a number of old disputed records. Keep in mind that the matter of determining extreme records is very difficult, and it is often a judgment call as to whether an old record is reliable or not. The World Meteorological Organization is currently in the process of contacting all nineteen of the nations I list here to see if the records can be officially verified. So far, the records in Finland and Pakistan have been officially verified, and it appears likely that the records in Belarus and Ukraine will also have official sanction.

Figure 1. Climate Central put together a nice graphic showing the nations that have set new extreme heat records in 2010, which I've updated to include Bolivia.

Other national all-time extreme heat records set in 2010

Zambia recorded its hottest temperature in history Wednesday, October 13, when the mercury hit 42.4°C (108.3°F) in Mfuwe. The previous record was 42.3°C (108.1°F) set on November 17, 2005 in Mfuwe.

Belarus recorded its hottest temperature in its history on August 6, 2010, when the mercury hit 38.9°C (102.0°F) in Gorky. The previous record was 38.0°C (100.4°F) set at Vasiliyevichy on Aug. 20, 1946.

Ukraine recorded its hottest temperature in its history when the mercury hit 42.0°C (107.6°F) at Lukhansk on August 12, 2010. The previous record was set at the same location on August 1, 2010--41.3°C (106.3°F). Ukraine also reached 41.3°C on July 20 and 21, 2007, at Voznesensk.

Cyprus recorded its hottest temperature in its history on August 1, 2010 when the mercury hit 46.6°C (115.9°F) at Lefconica. The old record for Cyprus was 44.4°C (111.9°F) at Lefkosia in August 1956. An older record of 46.6°C from July 1888 was reported from Nicosia, but is of questionable reliability.

Finland recorded its hottest temperature on July 29, 2010, when the mercury hit 37.2°C (99°F) at Joensuu. The old (undisputed) record was 95°F (35°C) at Jyvaskyla on July 9, 1914. The previous official record was 35.9°C at Turku in July 1914, but this reading has been disputed by weather records researcher Maximiliano Herrera as being unreliable due improper siting of the instrument too close to tall buildings.

Qatar had its hottest temperature in history on July 14, 2010, when the mercury hit 50.4°C (122.7°F) at Doha Airport. The previous record was 49.6°C in July 2000 at the same location. There are other stations in Qatar,but only the Doha International Airport has reliable data.

Russia had its hottest temperature in history on July 12, when the mercury rose to 45.4°C (113.7°F) at the Utta hydrological station in the Kalmykia Republic, in the European portion of Russia near the Kazakhstan border. This station is not under control of the Russian meteorological service, and may not be 100% reliable. A reading of 44.0°C (111.2°F) was also recorded in Yashkul, Kalmykia Republic, on July 11. The previous hottest temperature in Russia (not including the former Soviet republics) at a non-automated station was the 43.8°C (110.8°F) reading measured at Alexander Gaj, Kalmykia Republic, on August 6, 1940. The previous hottest temperature at an automated station was 45.0°C recorded in August 1940 at El'ton. The remarkable heat in Russia this year has not been limited just to the European portion of the country--the Asian portion of Russia also recorded its hottest temperature in history this year, a 42.7°C (108.9°F) reading at Ust Kara, in the Chita Republic on June 27. The 42.3°C (108.1°F) reading on June 25 at Belogorsk, near the Amur River border with China, also beat the old record for the Asian portion of Russia. The previous record for the Asian portion of Russia was 41.7°C (107.1°F) at Aksha on July 21, 2004.

Sudan recorded its hottest temperature in its history on June 22 when the mercury rose to 49.7°C (121.5°F) at Dongola. The previous record was 49.5°C (121.1°F) set in July 1987 in Aba Hamed.

Niger tied its record for hottest day in history on June 22, 2010, when the temperature reached 47.1°C (116.8°F) at Bilma. That record stood for just one day, as Bilma broke the record again on June 23, when the mercury topped out at 48.2°C (118.8°F). The previous record was 47.1°C on May 24, 1998, also at Bilma.

Saudi Arabia had its hottest temperature ever on June 22, 2010, with a reading of 52.0°C (125.6°F) in Jeddah, the second largest city in Saudi Arabia. The previous record was 51.7°C (125.1°F), at Abqaiq, date unknown. The record heat was accompanied by a sandstorm, which caused eight power plants to go offline, resulting in blackouts to several Saudi cities.

Chad had its hottest day in history on June 22, 2010, when the temperature reached 47.6°C (117.7°F) at Faya. The previous record was 47.4°C (117.3°F) at Faya on June 3 and June 9, 1961, but old readings at this station, particularly in the 1950s, were affected by over-exposure of the instrument to sun.

Kuwait recorded its hottest temperature in history on June 15 in Abdaly, according to the Kuwait Met office. The mercury hit 52.6°C (126.7°F). Kuwait's previous all-time hottest temperature was 51.9°C (125.4°F), on July 27,2007, at Abdaly. Temperatures reached 51°C (123.8°F) in the capital of Kuwait City on June 15, 2010. There were some readings as high as 54°C at Mitribah this summer, but the intrument there was found to be out of calibration.

Iraq had its hottest day in history on June 14, 2010, when the mercury hit 52.0°C (125.6°F) in Basra. Iraq's previous record was 51.7°C (125.1°F) set August 8, 1937, in Ash Shu'aybah.

Pakistan had its hottest temperature in history on May 26, when the mercury hit an astonishing 53.5°C (128.3°F) at the town of MohenjuDaro, according to the Pakistani Meteorological Department. While this temperature reading must be reviewed by the World Meteorological Organization (WMO) for authenticity, not only is the 128.3°F reading the hottest temperature ever recorded in Pakistan, it is the hottest reliably measured temperature ever recorded on the continent of Asia. The old Pakistani record was 52.8°C (127°F) at Jacobabad in 1919.

Myanmar (Burma) had its hottest temperature in its recorded history on May 14, when the mercury hit 47.2°C (117.0°F) in Myinmu. This broke the record of 47.0°C set at the same location two days previous (May 12.) Myanmar's previous hottest temperature was 46.0°C (114.4°F) at Magwe in May, 1980. According to Chris Burt, author of the authoritative weather records book Extreme Weather, the 47.2°C measured this year is the hottest temperature in Southeast Asia history.

Ascension Island (St. Helena, a U.K. Territory) had its hottest temperature in history on March 25, 2010, when the mercury hit 34.9°C (94.8°F) at Georgetown. The previous record was 34.0°C (93.2°F) at Georgetown in April 2003, exact day unknown.

The Solomon Islands had their hottest temperature in history on February 1, 2010, when the mercury hit 36.1°C (97°F) at Honiara Henderson. The previous record for the Solomon Islands was 35.6°C (96.0°F) at Honaiara, date unknown.

Colombia had its hottest reliably measured temperature in history on January 24, 2010, when Puerto Salgar hit 42.3°C (108°F). The previous record was 42.0°C (107.6°F) at El Salto in March 1988 and April 1998 (exact day unknown.)

Also Notable

China set its all-time heat record for an inhabited place on June 20, 2010, when the mercury hit 48.7°C (119.7°F) at Toyoq. The all-time heat record for China is 49.7°C (121.5°F) on August 3, 2008 at the Aydingkol automatic weather station at the uninhabited Ading Lake in the Turfan Depression in Northwest China.

Martinique, an island in the Caribbean that is a French territory, set what may be its hottest reliably measured temperature record in September, when the mercury hit 36.2°C (97.2°F) at Francois Chopotte. The current all-time record is 36.5°C (97.7°F) in April 1983 at St. Pierre Observatory, but this measurement was taken with older equipment that may not be reliable.

The occupied west bank of Palestine, the portion of Israel that declared independence in 1988 but is not recognized by all nations as a sovereign country, recorded its hottest temperature in history on August 7, 2010, when the temperature hit 51.4°C (124.5°F) at Kibbutz Almog (also called Qalya or Kalya) in the Jordan Valley. The previous record for this portion of Israel was set on June 22, 1942, at the same location.

All-time national heat records were missed by 1°C or less in many other nations this summer, including the Azores, Morocco, Estonia, and Latvia.

National cold records set in 2010

No nations set record for their coldest temperature in history in 2010. I regret reporting earlier this year that Guinea had done so. Guinea actually had its coldest temperature in history last year, on January 9, 2009, when the mercury hit 1.4°C (34.5°F) at Mali-ville in the Labe region.

Extensive credit for researching these records goes to weather records researcher Maximiliano Herrera, who maintains a comprehensive set of extreme temperature records on his web site. I also thank I thank Christopher C. Burt and Howard Rainford for their assistance identifying this year's new extreme temperature records.

Commentary

The period January - October was the warmest such 10-month period in the planet's history, and temperatures over Earth's land regions were at record highs in May, June, and July, according to the National Climatic Data Center. It is not a surprise that many all-time extreme heat records are being shattered when the planet as a whole is so warm. Global warming "loads the dice" to favor extreme heat events unprecedented in recorded history. In fact, it may be more appropriate to say that global warming adds more spots on the dice--it used to be possible to roll no higher than double sixes, and now it is possible to roll a thirteen.

I'll have a new post on Wednesday, when I plan to discuss how La Niña may affect the coming winter in North America.

Jeff Masters

http://www.wunderground.com/blog/JeffMaste...l?entrynum=1701

[paix 0]

Le toit du stade de Minneapolis s'est effondré durant une tempête de neige :

A raging December blizzard buried Minneapolis, Minnesota under 17 inches of snow over the weekend, triggering the collapse early this morning of the air-inflated roof of the Minneapolis Metrodome, home of the Minnesota Vikings football team. The storm roared out of Canada on Friday morning, bringing heavy snow, sustained winds of 25 – 35 mph, and blizzard conditions through Montana, North Dakota, South Dakota, Minnesota, Wisconsin, and Michigan. The heaviest snows occurred near Osceola, Wisconsin, where 23 inches fell. The storm also dumped 21" at Noisy Basin, Montana, 14" in Williston, ND, and 14" in Negaunee, MI. Officially, 17.1” of snow fell at the Minneapolis airport; 16.3” of it on Saturday. Saturday's snow amounted to 1.75” of melted precipitation, for a snow-to-water equivalent ratio of 9:1. For those of you who've ever shoveled snow know, that's a very wet, heavy snow, and its no wonder the roof of the Metrodome had trouble with such a huge weight of snow.

Figure 1. Amount of precipitation for the 24 hours ending at 1am EST Sunday, in melted snow equivalent. Up to two inches of precipitation fell (brown colors) near the Minnesota-Wisconsin border. Image credit: NOAA /NOHRSC.

In the wake of the storm, bitterly cold air from Canada will sweep southwards into the U.S., and high temperatures near 0°F are expected for Minneapolis on Monday. Lows near -30°F are expected in northern Minnesota near International Falls on Monday night. The cold will penetrate into Florida's orange groves Monday night, with lows in the mid-20s expected in Orlando.

Jeff Masters

P.S. : Pour ceux qui ne sont pas habitués aux unités anglo saxonnes, 23 inches = 58,4 centimètres, 20 inches = 50,8 centimètres et 10 inches = 25,4 centimètres.

Modifié 18 décembre 2010 par paix

[dj-snow 0]

Le toit du stade de Minneapolis s'est effondré durant une tempête de neige :

P.S. : Pour ceux qui ne sont pas habitués aux unités anglo saxonnes, 23 inches = 58,4 centimètres, 20 inches = 50,8 centimètres et 10 inches = 25,4 centimètres.

voici justement la vidéo où l'on voit le toit du stade s'écrouler , impressionant !

vidéo

[paix 0]

J'avais commencé dans le sujet de la saison cyclone de l'HS :

http://www.forums.meteobelgium.be/index.ph...st&p=406968

Mais l'Australie continue à vivre un gros évènement pluvio orageux avec jusqu'à 150 millimètres de pluies dans l'état de Queensland. Et ce n'est pas fini, le creux de mousson continuant à générer de fortes précipitations :

IDQ20032

Australian Government Bureau of Meteorology

Queensland

TOP PRIORITY FOR IMMEDIATE BROADCAST

SEVERE WEATHER WARNING

for Heavy rainfall

For people about the east coast between St Lawrence and the NSW border,

extending inland to the southern Central Highlands and Coalfields, the northeast

Maranoa and Warrego and the northern Darling Downs and Granite Belt districts.

Issued at 10:35 pm on Sunday 26 December 2010

Synoptic Situation: At 9:00 pm the monsoon trough sat from northwest Queensland

to the southern interior with rain areas to its east. A 1019 hPa high over New

Zealand extended a ridge onto the Queensland east coast.

Widespread rainfall is likely to become heavy again on Monday on the east coast

between St Lawrence and the NSW border and inland through the southern Central

Highlands and Coalfields, the northeast Maranoa and Warrego and the northern

Darling Downs and Granite Belt districts.

Recent Events:

Rainfall totals since 9am Sunday: Up to 150mm in southwest parts of the Central

Highland and Coalfields, Up to 80mm to the west and south of Bundaberg,

widespread falls of 60 to 110mm about the Gold Coast and adjacent hinterland.

The State Emergency Service advises that people in the affected area should:

· avoid driving, walking or riding through flood waters

· take care on the roads, especially in heavy downpours

· avoid swimming in swollen rivers and creeks

Contact the SES on 132 500 for emergency assistance if required.

The next warning is due to be issued by 5am Monday AEST

This warning is also available through TV and Radio broadcasts; the Bureau's

website at www.bom.gov.au or call 1300 659 219. The Bureau and State Emergency

Service would appreciate this warning being broadcast regularly.

L'image satellite est impressionnant, avec des complexes orageux dont les sommets de nuages sont ponctuellement sous les -80°C :

On peut aussi rajouter à l'événement La Nina, une phase MJO humide qui aide la convection à se faire :

Modifié 26 décembre 2010 par paix

[ElNino27 0]

Pluies verglaçantes à Moscou :

http://fr.news.yahoo.com/3/20101226/twl-ru...as-091cf94.html

[paix 0]

Les aéroports de New York et Moscou paralysées par les intempéries

LEMONDE.FR avec AFP et AP | 26.12.10 | 20h30

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Entre 22 et 38 cm de neige étaient attendus dimanche à New York.

Entre 22 et 38 cm de neige étaient attendus dimanche à New York.AP/Jim R. Bounds

Après Londres et Paris, ce sont Moscou et New York, deux importantes plate-formes aéroportuaires, qui subissent les caprices de l'hiver. Une tempête de neige s'abattait dimanche 26 décembre sur la côte Est des Etats-Unis obligeant les compagnies aériennes à annuler des centaines de vols notamment au départ des aéroports de New York, Philadelphie et Boston. Entre 22 et 38 cm de neige étaient attendus dimanche à New York et 22 cm à Boston d'ici à lundi en raison d'une tempête de neige qui touche le nord de la côte Est, de la Caroline du Nord à la Nouvelle Angleterre, et se déplace vers le nord, ont indiqué les services météo américains.

Continental Airlines a annulé 265 vols au départ de l'aéroport de Newark, dans la banlieue de New York, et prévoyait de cesser complètement ses activités dans cet aéroport dimanche en fin de journée jusqu'à lundi matin. La compagnie United a dû annuler 110 vols à partir des aéroports de New York, Boston et Philadelphie. "Nous avons essayé d'annuler à l'avance le plus de vols possible pour éviter de prendre nos clients par surprise", a expliqué un porte-parole de le compagnie.

De son côté la compagnie AirTran a annulé 81 vols dans les villes du Nord-Est qui devaient être les plus touchées. La compagnie Southwest a aussi annulé des vols à partir des aéroports de Washington, Baltimore et Newark. Ce matin, plusieurs dizaines de vols en partance de Roissy (Paris) et de Heathrow (Londres) et à destination de la côte Est américaine ont également été annulés.

L'AÉROPORT DE MOSCOU PLONGÉ DANS LE NOIR

L'aéroport international Domodedovo de Moscou était fermé dimanche et plongé dans le noir à la suite de coupures de courant provoquées par des pluies givrantes et des averses de grêle et plusieurs vols ont été également annulés dans un autre aéroport international, Cheremetievo. Selon l'agence fédérale de l'aviation, quelque 8 000 personnes n'ont pas pu décoller de Domodedovo, un aéroport qui accueille chaque jour quelque 55 000 passagers.

Dans la soirée, l'aéroport était plongé dans le noir. Les trains électriques reliant Domodedovo à la capitale russe ne fonctionnaient pas non plus et les prix des taxis ont été multipliés par dix. Au total, plus de 150 vols ont été reportés ou annulés dimanche à Moscou, 100 à Domodedovo et 50 à Cheremetievo, au nord de la capitale. Air France a dû annuler plusieurs vols entre Paris et Cheremetievo faute de substances anti-gel pour nettoyer les pistes de décollage à Moscou.

Les coupures de courant ont privé d'électricité quelque 100 000 personnes dans les environs de Moscou et environ 80 000 personnes dans les régions de Vladimir, Tver et de Smolenk (centre). Le verglas paralyse la circulation en raison de températures proches de zéro avec des pluies qui transforment Moscou en patinoire.

http://www.lemonde.fr/planete/article/2010...57938_3244.html

[paix 0]

Transportation in Disarray After Blizzard Tapers Off

A woman walked through the East Village early Monday. More Photos »

By LIZ ROBBINS and J. DAVID GOODMAN

Published: December 26, 2010

Sunshine and deep piles of sparkling snow blanketed the Northeast on Monday, but for frustrated commuters and holiday travelers struck by the winter’s first ferocious storm, the beauty was short-lived.

Gusting winds kicked up formidable snowdrifts further crippling an entire New York metropolitan region trying to dig out, shutting down the three major area airports for most of the day, stopping commuter trains and some subway lines — even stranding some passengers on trains overnight — and causing nightmarish delays without much of a sense of when the conditions would improve.

Newark International and John F. Kennedy International airports will both open at 6 p.m. for departing flights only, Sara Beth Joren, a spokeswoman for the Port Authority of New York and New Jersey, said. La Guardia Airport opened at 4 p.m., and some flights would be leaving later Monday evening, Ms. Joren said. All three airports are expected to resume arrivals and departures on Tuesday morning.

New York City Mayor Michael R. Bloomberg, speaking at an afternoon news conference, succinctly captured the power of the storm: “A lot of snow, every place,” Mr. Bloomberg said. “It was a very heavy snowfall, and as you know, it was accompanied by intense winds.”

But, he concluded: “The world has not come to an end, the city is going fine.”

Still, nearly two feet of snow was dumped on the New York area through the overnight hours, and its cumulative effects were plainly evident during the day on Monday.

High winds damaged switches for train lines, knocked down power lines, drifted snow perilously deep on tracks and even caused plow trucks to get stuck. City buses stalled on hills and cars abandoned on side streets complicated snow removal as New York struggled mightily to recover before the evening commute began.

“Our real priority right now is digging everything out and getting everything in place for service tomorrow,” Jay Walder, the chairman of the Metropolitan Transit Authority, said at Mr. Bloomberg’s news conference at City Hall. “Service tomorrow will still not be a walk in the park. It will be a tough day, we’ll have limited service.”

Service on the Long Island Rail Road was not scheduled to resume until late Monday evening, officials said. After having suspended all service, the Metro-North rail network was using diesel equipment to offer hourly service in each direction on all three of its lines, the Hudson, Harlem and New Haven, the railroad said. All New Jersey Transit trains were operating with delays of about 15 minutes, but no New Jersey Transit buses were operating.

Amtrak trains, delayed throughout the morning after a total shutdown on the New York to Boston route on Sunday night, were beginning to move again.

But Penn Station on Monday morning was still overrun with bedraggled passengers, some of whom slept overnight in the waiting room and even on a couple of trains. Two L.I.R.R. trains on tracks 18 and 19 turned into a makeshift hotel (minus the pillows), passengers said, as officials kept the trains open all night with lights and heat.

“The whole thing was great,” said Dan Cassone, 33, who could not return to Bellmore, L.I., with his friend Christine Duffy, 29. “We kind of saw it as an adventure.”

But by morning, the thrill of adventure turned into simply agony for some marooned on the city streets. New York City Transit received reports of more than 400 stuck buses overnight and into the early morning.

Lenford Williams, a bus driver, said he had been stuck on Court Street in Brooklyn since 11 p.m. Sunday. By noon on Monday, the two blocks on Court Street between Degraw and Butler Streets provided a microcosm for snowbound New York: there were two M.T.A. buses, two large city snow plows and two police cars — all stuck in the snow.

Mr. Williams said that some time before he arrived another bus had fishtailed and become stuck at the corner of Degraw Street, blocking Court Street. Then a snow plow skidded and become stuck.

By the time Mr. Williams came along there was no way for him to get through. Another plow was stuck behind him, with a crew of about eight sanitation workers shoveling around the tires trying to get the vehicle free. The snow was not deep but Mr. Williams said his bus was “frozen” in its spot and he could not get it to move.

Mr. Williams, who is from Jamaica and has been a bus driver for two years, said he did not sleep all night. He kept warm with the heat on the bus, although he turned the engine off periodically because he was worried about running out of fuel.

“I want to go back to Jamaica where there’s no snow,” he said.

Although New York City Transit takes extensive measures to prevent service disruptions in a snowstorm, "we were overwhelmed," said Charles Seaton, a spokesman for the transit authority. Blowing snow drifts of up to four feet high contributed to equipment problems and prevented crews from accessing some tracks and switches.

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Another problem on Monday was transportation for train operators, themselves. Many were having trouble getting to work, and Mr. Seaton said that a dearth of workers had contributed to the decision to shut down the entire B line.

Getting to the area airports in the anticipation that they would be reopening Monday afternoon was not easy, either. The A train was suspended in both directions between the Euclid Avenue Station and the Far Rockaway-Mott Avenue Station, preventing travelers from reaching the AirTrain to get to Kennedy Airport.

The rare combined shutdown of the region’s three normally bustling main airports on Sunday and Monday could cause delays in the New York area likely to last through the remainder of the week, but the national effects could be limited after today.

About 1,400 flights were canceled nationwide on Monday out of a normal total of about 35,000 to 37,000 commercial flights, said Paul Takemoto, a spokesman for the F.A.A. in Washington.

Mr. Takemoto said that there could be limited effects for travelers whose itineraries do not involve New York, in contrast to some summertime disruptions, when flights scheduled to leave Dallas, Denver or Detroit could be delayed because the airplane was stuck on its way into or out of New York.

“Winter storms are a different beast,” Mr. Takemoto said. They move relatively slowly, he added, and the airlines see them coming, and avoid the areas where planes might get stuck.

The Philadelphia and Boston airports were open on Monday, which helped alleviate some backlogs in the Northeast, according to the F.A.A. By the morning, the snow had stopped falling in the New York area, after having deposited a total of 20 inches in Central Park, according to the National Weather Service. That made it the sixth snowiest storm in the park’s history; the record is 26.9 inches in 24 hours in February 2006.

The deepest snow was recorded in Rahway, N.J., where 32 inches fell. The storm had largely moved on from New York City by sunrise, heading northeast out past Long Island and up over Nantucket, gradually weakening, the Weather Service said.

But for all its bluster and powder, the monster storm was technically a blizzard only outside of Manhattan. The winds in Central Park topped out at 36 miles per hour but were not sustained over a period of three consecutive hours, nor was the visibility under a quarter of a mile for that period — both requirements to qualify as a blizzard.

“We didn’t quite make the criteria in Central Park,” said Matt Scalora, a meteorologist with the National Weather Service in Central Park. “But we did meet the criteria at J.F.K. Airport and La Guardia,” he added.

The winds reached 59 miles an hour around 8 p.m. on Sunday night at John F. Kennedy International Airport and 55 miles an hour at La Guardia Airport.

On Sunday evening, Bayville, in Nassau County, registered the highest wind gust for the area — 68 miles an hour — and winds reached 60 miles or higher across Connecticut and New Jersey as well. “Last year with the winter storms, we didn’t have winds as high across so many areas,” Mr. Scalora said. “It’s definitely rare.”

Throughout the morning winds were gusting up to 4o miles per hour in Midtown Manhattan, throwing snow from the ground into the faces of harried pedestrians.

Consolidated Edison reported upward of 4,000 customers without power in New York City and Westchester County as downed trees and high winds knocked over power lines. The situation had improved slightly from Sunday night, when 9,000 homes were dark, but problems were expected to continue into late into Tuesday.

“We are looking at an estimated restoration time as early as 5 a.m. and as late as 6 p.m. on Tuesday because some of the roads are impassible for the crews,” said D. Joy Faber, a spokeswoman for the utility.

Long Island Power Authority reported that 5,033 customers were still without power at 2:30 p.m.

The storm was just in time to disrupt the plans of thousands of people trying to get home after the holiday, return unwanted gifts or take advantage of post-holiday sales. Public schools had not been scheduled to be in session, denying many children in the Northeast the added joy of a missed school day.

The storm was blamed for at least one death, after a driver slammed into a utility pole in Mount Olive Township, N.J., on Sunday evening, according to the police there.

It also provided New Yorkers a harrowing subway tale to think about ahead of their morning commute. Riders who boarded an A train in Queens around 1 a.m. were stranded for more than six hours when their train stopped moving. While passengers were free to leave the subway system, the station is not located near other transit options. “Once you get off the train there’s basically no place else to go,” Mr. Seaton said. At 7:52 the ordeal came to an end, though perhaps not an entirely happy one for the passengers. A rescue train finally reached the Aqueduct station and towed the stricken train to the Rockaways terminal.

The Weather Service called it the biggest storm in the region since last February, when record snowfalls paralyzed the mid-Atlantic states but largely spared New York City.

On Monday, revelers took to the park for a day of sledding and snow-frolicking, while post-Christmas shoppers found a handful of stores closed or opening late.

“It’s quite a challenge to maintain the parking lots completely clear of snow,” said Lorenzo Lopez, a spokesman for Wal-Mart, which was forced to close 20 of its East Coast stores on Sunday. Seven were still closed on Monday. In Manhattan, the Century 21 department store delayed its opening by several hours.

Reporting was contributed by Michael M. Grynbaum, Colin Moynihan and William Neuman in New York. Matthew L. Wald contributed from Washington.

http://www.nytimes.com/2010/12/28/nyregion...amp;_r=1&hp

A major blizzard continues to pound New England with heavy snow and winds gusting to near hurricane force as the 976 mb low tracks slowly northeastward into the Gulf of Maine. The snow has mostly ended across New York City and the mid-Atlantic, where snowfall rates as high as 3 - 4 inches per hour occurred during "thundersnow" snow squalls at the peak of the storm late last night and early this morning. At the height of the storm, blizzard warnings were in effect for the entire U.S. coast from Maryland to Maine. The heaviest snows fell about 50 miles to the west and north of New York City. Lyndhurst, New Jersey, located about 50 miles northwest of New York City, got 29 inches, and several nearby towns also reported snows in excess of 24 inches. Though the snow has mostly ended in these regions, strong winds will continue through the early afternoon, creating blizzard conditions in blowing snow.

Figure 1. Satellite image from 8am EST December 27 of the Post-Christmas Blizzard of 2010 over New England. Image credit: NASA/Goddard Space Flight Center.

The blizzard is in full swing across much of Massachusetts, Rhode Island, Connecticut, New Hampshire, and Maine, where snowfall rates of 1 - 2 inches per hours are common in heavy snow bands, with high winds creating blizzard conditions. The strongest wind gust from the mighty blizzard was 80mph, measured at Wellfleet on Cape Cod at 10:52pm last night. Wind gusts of 50 - 60 mph have been common along most of the coast of Connecticut, Rhode Island, and Southeast Massachusetts. The storm's strong northeast winds whipped up a storm surge of 2 - 3 feet that affected the coast just north of Boston, and in Central Long Island Sound, during the high tide cycle at 3am this morning. Moderate flooding that shut many roads occurred, and some damage to buildings probably resulted. The flooding danger for Massachusetts and Long Island Sound is now past, as the storm moves into Maine and Canada.

Snowfall amounts at major cities for the December 26-27, 2010 storm, as of 8am EST:

Newark, NJ 20.0"

Atlantic City, NJ 19.0"

East Boston, MA 16.5"

Ocean City, MD 13.5"

NYC Central Park, NY 13.0"

Philadelphia, PA 12.4"

East Providence, RI 12.0"

Danbury, CT 11.1"

Augusta, ME 10.0"

Woodstock, VT 10.0"

Bridgeport, CT 8.0"

Boston, MA 6.5"

Wilmington, DE 3.4"

An unusual Nor'easter for a La Niña year

This winter, we are experiencing La Niña conditions in the Equatorial Eastern Pacific, meaning that cold waters have upwelled from the depths off the coast of South America, cooling a huge region of Pacific waters to below-average levels. In most winters, the presence of La Niña acts to deflect the jet stream in such a way the the predominant storm track takes winter storms into the Pacific Northwest, then down through the Upper Midwest and Ohio Valley. According to Dr. David A. Robinson, the New Jersey State Climatologist and Chairman of the Department of Geography at Rutgers University, this sort of flow pattern keeps New England safe from Nor'easters, as storms tend to move from the Ohio Valley northeastwards into Canada, keeping New England in a warm southwesterly flow of air. However, today's storm defied climatology, and gave the mid-Atlantic and New England one of their worst poundings on record for a La Niña Nor'easter. It was the first storm in at least ten La Niña winters, dating back to 1970, to bring 10" of more of snow to New Jersey, according to Dr. Robinson. In Philadelphia, which got 12.4" from this storm, the National Weather Service stated that only one La Niña winter in the past century has had a storm that dumped more than 10" of snow on city--a December 1909 Nor'easter. The reason for the unusual Nor'easter this year is that it happened to get started right when the atmosphere was transitioning from one major flow pattern to another. Since late November, we have been locked into a pattern featuring very weak low pressure over Iceland, and weak high pressure over the Azores--a strongly negative North Atlantic Oscillation (NAO) and Arctic Oscillation (AO). This pattern, which has allowed a lot of cold air to spill out of the Arctic and into the Eastern U.S. and Western Europe, is now breaking down and transitioning to a very different winter pattern. This new pattern will feature a more typical configuration for winter, with the Icelandic Low and Azores High close to their usual strengths. Today's Nor'easter managed to sneak in just as the atmosphere was transitioning from one major flow pattern to a new one, resulting in the rare La Niña snowstorm for New England. The new winter flow pattern looks to stay in place for at least the first two weeks of January, resulting in warmer than average winter weather for both the U.S. East Coast and Western Europe.

Jeff Masters

http://www.wunderground.com/blog/JeffMaste...p=200810#photo0

L'état d'urgence est déclaré pour 6 états, et la Garde Nationale est apellé en renforts :

Aux USA aussi, la neige sème la pagaille

publié le 27.12.2010 21h56

La côte Est des Etats-Unis est actuellement touchée par une sévère tempête de neige. De nombreux voyageurs sont ainsi bloqués dans les aéroports de New-York où les vols sont annulés par centaines.

Non la désorganisation qu'entraîne une belle chute de neige n'est pas un mal français, encore moins européen. A l'heure où l'Angleterre envisage de sanctionner certains aéroports, où la France ne cesse de pester contre ses transports qui circulent peu, ou mal, quand il neige, les USA connaissent à leur tour des difficultés similaires.

A New-York, les vols aériens sont annulés par centaines et les trois aéroports internationaux de la ville sont fermés. Depuis plusieurs heures en effet, une belle tempête de neige s'est abattue sur la côte Est des Etats-Unis, piégeant ainsi, comme ailleurs en Europe, des millions d'Américains en pleine période de fêtes.

Au total, quelque 2 000 vols ont été annulés à cause de la neige. Ces annulations tombent mal, l'Europe étant elle aussi paralysée par le mauvais temps. La météorologie nationale, qui maintenait aujourd'hui une alerte au blizzard entre New York et le Maine (nord-est), prévoyait des précipitations neigeuses de 30 à 60 cm. La tempête devrait progressivement se calmer dans la région au cours de la journée de lundi, au fur et à mesure qu'elle se déplace vers le nord.

Par endroits, les routes étaient impraticables et près de 60 000 habitants du Massachusetts, où l'état d'urgence a été déclaré, ont été privés d'électricité hier. A New York, où le vent atteignait 90 kmh dimanche, le maire Michael Bloomberg a lancé des appels à la prudence. "Nos équipes d'entretien ont travaillé toute la nuit mais les conditions routières sont mauvaises, avec des interruptions et des retards dans les transports en commun. J'appelle les New-Yorkais à ne pas prendre leur voiture afin de libérer les routes pour laisser travailler les services d'urgence et de déneigement", a-t-il dit aujourd'hui.

Comme en France, les services municipaux ont été critiqués par les médias locaux pour leur lenteur à rétablir la situation. La ligne de trains de banlieue entre Manhattan et Long Island était paralysée, de même que des portions du réseau de bus et de métro.

Les gouverneurs des Etats du Delaware, du Maryland, du Massachusetts, de Caroline du Nord, du Rhode Island et de Virginie ont fait appel aux réservistes de la Garde nationale pour aider les autorités civiles à permettre le retour à la normale.

La neige a également touché, fait inhabituel, les Etats du sud-est du pays, dont la Caroline du Sud. Atlanta, en Géorgie, a connu son premier Noël blanc depuis 128 ans.

Au Canada, la tempête a commencé à sévir pendant la nuit et devait laisser de 30 à 50 cm de neige sur le Nouveau-Brunswick et l'est du Québec et provoquer de fortes pluies sur le sud de la Nouvelle-Ecosse.

http://www.leprogres.fr/fr/france-monde/ar...a-pagaille.html

Certains ont en profité pour faire des vidéos hallucinantes, comme le montre ce message de PABLO :

http://www.forums.meteobelgium.be/index.ph...st&p=407267

[ElNino27 0]

Et vu sur face de chèvre ... C'est effectivement hallucinant ! 80 cm en 20h donc ? Cela fait une moyenne de 4cm par heure, ce qui me paraît énorme !

[paix 0]

C'est énorme, mais ce n'est pas impossible. Si on convertit cela en équivalent eau, cela doit donner du 30 ou 40 mm/heure durant 20 heures, beaucoup mais tout à fait possible veut qu'ils se sont pris un gros Nor'easter. Ce qui m'impressionne surtout est la durée, 20 heures, des précipitations soutenus. Le gars qui filme devait être bien positionné pour recevoir l'événement dans sa longueur, et il doit être plutôt représentatif d'un extrême.

Modifié 28 décembre 2010 par paix

[ElNino27 0]

Vous remettez en cause le RC parce qu'il fait froid en Europe ?

Ceci devrait vous remettre sur les rails : http://elcomercio.pe/mundo/690498/noticia-...mica-alcanzo-40

[ElNino27 0]

http://www.rfi.fr/asie-pacifique/20101229-..._0&ns_fee=0

[paix 0]

Une image satellite, qui montre la persistance de développements orageux très développés et organisés :

Elle n'est pour ainsi dire pas changé depuis le passage de Tasha il y a une semaine et demi.

[paix 0]

Phénomènes météo de plus en plus extrêmes au Canada

Mise à jour le vendredi 31 décembre 2010 à 10 h 23

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Grandes marées à Sainte-Luce

Grandes marées à Sainte-Luce, au Québec

Des saisons de plus en plus chaudes, des jeux d'hiver sans neige à Vancouver et des phénomènes météo de plus en plus extrêmes ont marqué l'actualité météorologique en 2010 au Canada.

Comme chaque année, Environnement Canada a publié son palmarès des événements météorologiques qui ont le plus retenu l'attention au pays.

L'agence fédérale établit chaque année ce palmarès en fonction de la nature de ces événements, de leur étendue, de leur couverture médiatique et surtout de l'impact qu'ils ont eu sur la vie des Canadiens et l'activité économique du pays.

En 2010, la météo printanière et le manque de neige aux Jeux olympiques d'hiver de Vancouver se retrouvent en tête de son palmarès.

Il manquait à ce point de neige en février sur la côte ouest que les organisateurs des Jeux ont dû mobiliser des hélicoptères et une flotte de 300 camions pour en transporter sur les pistes de ski où se déroulaient les compétitions.

La faute à El Niño

Cet hiver très chaud et sans neige était lié au phénomène climatique récurrent El Niño qui s'est fait sentir de la Colombie-Britanique jusqu'au Québec cette année.

Selon les experts d'Environnement Canada, El Niño a fait grimper d'au moins 2° Celsius au-dessus de la normale la température hivernale moyenne au Canada en 2010. Dans l'Arctique québécois, le mercure est monté à plus de 6° C au-dessus de la normale.

Une saison des ouragans très active

Au deuxième rang du palmarès des événements météo de 2010 figure la saison très active des ouragans sur la côte est. Parmi les 19 tempêtes d'envergure en 2010 dans l'Atlantique, les ouragans Igor et Earl ont particulièrement secoué les provinces de l'est du pays où de nombreux dégâts et des inondations ont été rapportés.

Une année très chaude

La chaleur était aussi au rendez-vous au printemps, en été ainsi qu'en automne cette année. Selon Environnement Canada, le pays a connu en 2010 son printemps le plus chaud jamais enregistré.

L'été et l'automne sont arrivés respectivement aux troisième et au deuxième rangs des saisons les plus chaudes enregistrées au pays ces 63 dernières années.

Sécheresse et pluies abondantes dans l'ouest

Ce début de printemps chaud et sec a causé des maux de tête aux éleveurs de l'Ouest canadien, mais dès la mi-avril, la région a reçu d'importantes quantités de pluie qui n'ont cessé qu'en septembre. La chaleur et la sécheresse dans l'ouest du pays ont également provoqué d'importants feux de forêt en Colombie-Britannique. Ces derniers arrivent au septième rang du palmarès d'Environnement Canada.

Début d'hiver mouvementé pour l'Ontario et les Maritimes

Voiture prise dans la neige

Des centaines d'automobilistes sont été surpris par les bourrasques de neige sur les routes de l'Ontario.

Plus récemment, les puissants blizzards et les bourrasques de neige qui ont laissé près de deux mètres de neige sur le sud de l'Ontario entre les régions de Sarnia et de Strathroy arrivent au cinquième rang du palmarès, ex aequo avec les tempêtes de vents et les pluies diluviennes qui se sont abattues sur l'Est-du-Québec et les provinces Maritimes au cours des dernières semaines.

Au chapitre des événements violents, la région de Calgary, en Alberta, a connu le 12 juillet dernier la tempête de grêle la plus coûteuse de l'histoire du pays. Pendant une trentaine de minutes, la ville a reçu une pluie de grêlons dont certains atteignaient la taille de balles de baseball.

Une météo « déréglée »

Ces phénomènes météorologiques parfois violents et de plus en plus fréquents préoccupent les experts du climat.

« Si j'avais à qualifier la météo que nous avons observée au cours de la dernière année, je dirais inusitée, pour ne pas dire déréglée. La circulation des vents qu'on observe en haute altitude est pour ainsi dire atypique et dure de plus en plus longtemps. Cette persistance, c'est du jamais vu », a expliqué le météorologiste d'Environnement Canada René Héroux sur les ondes du réseau RDI.

si ne c'était qu'une opinion isolée... Mais non...

[paix 0]

Un billet de Jeff Masters

Massive flooding in Australia cuts off city of 75,000

Posted by: JeffMasters, 13:52 GMT le 03 janvier 2011

The arrival of the new year has brought continued misery to northeast Australia, where unprecedented flooding continues in the wake of weeks of torrential rains. The floods have killed at least ten people and covered an area the size of France and Germany combined, cutting off the coastal city of Rockhampton. Today, the military was forced to fly in food, water, and other supplies into Rockhampton, a city of 75,000, due to the lack of unflooded roads into the city. The local airport, all access roads, and all rail lines into the city are closed. The flooding has affected at least 21 other towns, and 200,000 people in northeast Australia. Australian Prime Minister Julia Gillard stated last week, "Some communities are seeing flood waters higher than they've seen in decades, and for some communities flood waters have never reached these levels before [in] the time that we have been recording floods." According to the National Climatic Data Center, springtime in Australia (September - November) had precipitation 125% of normal--the wettest spring in the country since records began 111 years ago. Some sections of coastal Queensland received over 4 feet (1200 mm) of rain from September through November. Rainfall in Queensland and all of eastern Australia in December was the greatest on record, and the year 2010 was the rainiest year on record for Queensland. The heavy rains are due, in part, to the moderate to strong La Niña event that has been in place since July. The relatively warm waters that accumulate off the northeast coast of Australia during a La Niña typically cause heavy rains over Queensland.

Figure 1. Comparison of river conditions in Queensland from today to December 30, 2010. While some rivers have fallen below major flood stage, the Fitzroy River at Rockhampton is rising, and may peak at levels not seen since 1918 on Wednesday. Image credit: Australian Bureau of Meteorology.

Figure 2. Rainfall in Queensland, Australia for December, 2010. Image credit: Australian Bureau of Meteorology.

The rains over Queensland continued yesterday and today, with many of the flooded regions receiving 1/2 - 1 inch (about 12 - 25 mm) of rain. Total rainfall amounts in the flood region over the past month are generally in the 16 - 24 inch range (400 - 600 mm). Predicted rainfall amounts for the next two days in the flooded region are less than 1/2 inch (12 mm), which should allow for river levels to peak by Tuesday or Wednesday, then slowly fall. However, heavy rains are predicted to affect the area again by Thursday, and it may be several weeks before the summer rains ease enough to allow all of Queensland's rivers to retreat below flood stage. Damage to infrastructure in Australia has been estimated at over $1 billion by the government, and economists have estimated the Australian economy will suffer an additional $6 billion in damage over the coming months due to reduced exports, according to insurance company AIR Worldwide. Queensland is Australia's top coal-producing state, and coal mining and delivery operations are being severely hampered by the flooding. Damage to agriculture is currently estimated at $400 million, and is expected to rise.

Jeff Masters

Et quelques réflexions. C'est loin d'être fini. Cela s'est un peu calmé déjà, mais le BOM of Australia continue d'émettre des avertissement pour Queensland, et parle même d'un possible empirement (empiration ? bref worsening en anglais...) de la situation à venir :

IDQ20032

Australian Government Bureau of Meteorology

Queensland

TOP PRIORITY FOR IMMEDIATE BROADCAST

SEVERE WEATHER WARNING

for heavy rainfall leading to localised flash flooding and potentially worsening

the existing river flood situation

For people in the Southeast Coast and eastern parts of the Wide Bay and Burnett

districts.

Issued at 10:55 pm on Thursday 6 January 2011

Synoptic Situation: At 1030pm EST, an upper level low over the southeastern

interior will move north into the Capricorn district during Friday. Current rain

areas near the coast will develop back inland over the SE region during Friday.

Some heavy falls may occur about the eastern Burnett, Wide Bay and northern

parts of the Sunshine coast later on Friday with the potential for flash

flooding and this may contribute to existing river flooding.

Flood warnings are current for various rivers and streams in these districts;

refer to these products [www.bom.gov.au/qld] for further information.

The State Emergency Service advises that people in the affected area should:

· avoid driving, walking or riding through flood waters

· take care on the roads, especially in heavy downpours

· avoid swimming in swollen rivers and creeks

Contact the SES on 132 500 for emergency assistance if required.

The next warning is due to be issued by 11pm Thursday

This warning is also available through TV and Radio broadcasts; the Bureau's

website at www.bom.gov.au or call 1300 659 219. The Bureau and State Emergency

Service would appreciate this warning being broadcast regularly.

L'explication de ce déluge tient pour une part à La Nina. Même si en terme d'anomalies de températures de surface, ce n'est pas exceptionnel, la circulation atmosphérique l'est un peu. Ainsi, la SOI se maintient aux alentour de +20 à +30, en établissant au passage un nouveau record pour le mois de Décembre, et atteignant la plus haute valeur mensuelle depuis Novembre 1973. Le commentaire du BOM :

"The Southern Oscillation Index (SOI) value for December of +27 is the highest December SOI value on record, as well as being the highest value for any month since November 1973. "

Pour commentaire, je préciserais qu'en Novembre 1973 on était à +31.

Sachant qu'une SOI positive renforce la circulation zonale d'Est en Ouest, direction l'Australie donc, on comprend un peu mieux pourquoi Queensland se noie.

Modifié 6 janvier 2011 par paix

[Frédéric Bruls 0]

Tu peux traduire par aggravation worsening.

[paix 0]

Tu peux traduire par aggravation worsening.

En effet bonne idée merci

[paix 0]

Pour tous ceux qui sont en manque de neige, l'Indiana vient de se prendre le "lake effect" du siècle avec 11 mètres de neige en 48 heures...

South Bend nearly sets all-time Indiana snowfall record

An epic lake effect snow storm hit South Bend, Indiana Friday and Saturday, burying the city under a remarkable 36.6" of snow. It was the heaviest two-day snow storm in South Bend's history, breaking a record that had stood since 1909 (a 29" snow storm on January 30 - 31.) The 32.6" that fell in a 24-hour period between 4pm EST 1/7 and 4pm EST 1/8 came just 0.4" short of matching Indiana's heaviest 24-hour snow storm on record. Indiana's heaviest 24-hour snow event was the 33.0" that fell at Salem in December 2004, according to wunderground's weather historian, Christopher C. Burt.

While the current snow event is over, new snows are expected in South Bend beginning Wednesday, when a renewed strong northwesterly flow of air off of Lake Michigan will develop in the wake of the strong winter storm currently pounding the Southern U.S. Another 8+ inches of snow may fall in the South Bend area in the new storm.

Pour les amateurs de données chiffrées :

Snowstorms in the South: An Historical Perspective

Mise à jour: 06:18 GMT le 13 janvier 2011

Snowstorms in the Southeast and Deep South of the United States: An Historical Perspective

Atlanta, Georgia was amazed recently when 4-6” of snow (and ice) accumulated this past Sunday and Monday. Furthermore, snow fell on Christmas Day (officially 1.4”) in the Atlanta area as well. So how unusual is this? Of course, it is unusual but not close to record-breaking snowfall anywhere in the Southeast. Huntsville, Alabama recorded 8.9” and this was their 3rd heaviest accumulation on record but still a long way from the all-time record of 17.1” set on New Years Eve 1963-1964. Atlanta’s official 4.4” accumulation is also distant from their record of 11.2” set on January 7, 1940.

The Greatest Southeastern Snowstorms on Record

The following is a summary of the all-time greatest snowstorms to have been observed in the Gulf and Deep South Region.

JANUARY 9-11, 1800: Florida, Georgia, and South Carolina

The single greatest snow accumulations ever reported from Florida to coastal Georgia and coastal South Carolina occurred on January 9-11 some 211 years ago in 1800. A survey party demarcating the border between Florida and Georgia was encamped at the mouth of St. Mary’s River near where Ft. Clinch State Park is now just north of the current site of Jacksonville, Florida. They reported heavy snow most of the day and night of January 10th and awoke to 5” of snow cover. More may have actually fallen and melted prior to sunrise on the 11th when they made their observation. In and around Savannah, Georgia 18” of snow fell with drifts up to 3-feet. Here the snow fell continuously for a 36-hour period from late evening January 9th until early morning January 11th. In Charleston, South Carolina, the State Gazette reported 8” of snow on level with severe drifting and gales. It would appear that Charleston was on the northern edge of the heaviest accumulations which were centered around Savannah. (For more about this event see Early American Winters: 1604-1820 pp. 159-160, by David M. Ludlum, American Meteorological Society, Boston, 1966).

In modern records the heaviest snowfalls have been the following for these locations: Jacksonville, Florida: 1.9” (February 12-13, 1899), Savannah, Georgia: 3.6” December 8, 1989; Charleston, South Carolina: 7.1” February 9-10, 1973.

DECEMBER 3-6, 1886: Southern Appalachians

An early season heavy wet snowstorm hammered all of Alabama and the higher elevations of Georgia and North Carolina December 3-6, 1886 with 12-16” of snowfall in central Alabama (Montgomery had a record 11.0”), 17-20” in the northern parts of Alabama, and up to 25” in northern Georgia (as was measured in Rome). But it was in the mountains of North Carolina that the most extraordinary accumulations were reported with 36-42” at places like Hot House, North Carolina and Ducktown, Tennessee. Asheville, North Carolina reported 33” of snow on level, almost double the amount from the famous ‘Superstorm’ of 1993.

FEBRUARY 14-16, 1895: Coastal Texas to Alabama

A coastal low in the Gulf of Mexico developed near Texas on February 14, 1895 and spread a mantle of deep snow from the coastal areas of northern Mexico to Florida over the following two days. Snowflakes were reported in Tampico, Mexico (the furthest south snow has ever been recorded at a coastal location in the Western Hemisphere: 22°18’N). Brownsville, Texas measured 3-6” and the accumulations became even more fantastic further up the coast: Galveston had 15.4”, Houston 20.0”, and Lake Charles, Louisiana 22.0”. A peak accumulation of 24” was measured at Rayne in southeast Louisiana, a state record. These amounts were actually ground depth measurements, so more may have actually fallen. New Orleans registered its greatest snowfall on record with an 8.2” as did Pensacola, Florida with 3.0”. A state record for Mississippi was set at Batesville with 20.0”.

New Orleans experienced its only true blizzard on February 12, 1899. Although only 3.8” of snow fell (compared to the 8.2” in 1895) the temperature fell from the mid-20°s to low teens during the snowfall (with strong winds) and then down to an all-time low of 6.8°F by the morning of February 13th. (photo from Historic New Orleans Collection).

DECEMBER 31, 1963-JANUARY 1, 1964: Mississippi and Alabama

Another record-breaking snow of note includes this event that still holds the following all-time snowfall records: Huntsville, Alabama 17.1”; Florence, Alabama 19.2”; Meridian, Mississippi 15.0”.

FEBRUARY 9-10, 1973: Piedmont of Georgia, South Carolina, and North Carolina

No snowstorm in the old or modern records can match that that struck the Piedmont regions of Georgia and South Carolina in February 1973. Macon, Georgia received 16.5” of snowfall and Augusta and Columbus both reported 14.0” (all-time records). Even Albany received its all-time accumulation of 3.0”. In South Carolina an all-time state record was achieved at Rimini with 24” and Columbia (16”) and Florence (17”) also set their respective all-time records for both a single snowstorm and a 24-hour accumulation.

This graphic shows the track of the surface low (solid line) and track of the 850mb low (dashed line) along with snow accumulation amounts during the storm of February 9-10, 1973. Peak snowfall was in central South Carolina with 24” at Rimini. (graphic from Weatherwise Magazine Vol. 27 p. 193, October, 1974).

MARCH 12-14, 1993: All of the interior Southeast

No summary of southern snowfall records would be complete without mention of the so-called ‘Superstorm’ or ‘Storm of the Century’. Among the notable all-time snowfall records achieved during this event are the state records for 24-hour snowfall in Georgia, 24.0” at Mountain City (modern record, see 1886); as well as Tennessee: 30.0” on Mt. LeConte, and also North Carolina: 36.0” on Mt. Mitchell. Mt. LeConte also reported an amazing Tennessee state record for a single-greatest storm total with 60.0” over the course of three days March 12-14. For the lower elevations all-time snowfall records were set at Birmingham, Alabama: 13.0” and Asheville, North Carolina: 16.5” (only a modern record, see storm of 1886 above).

One of the most famous weather maps of all time: the surface analysis for March 13, 1993 at 7 a.m. EST. (map from NOAA).

A Special Note About Snow in Florida

Aside from the snow event of 1800 readers might be curious as to what the modern snowfall records are for Florida. The greatest ‘statewide’ snowfall occurred during the famous East Coast blizzard and cold wave of February 1899 (the same event that brought sub-zero temperatures to Florida for the first and only time). On February 13th, 1899 snow flakes were observed as far south as Fort Meyers and a general 1”+ accumulation occurred statewide north of Gainesville. Jacksonville recorded its greatest modern accumulation of 1.9”, 2.1” was measured at Pensacola, and up to 6” was anecdotally reported near the Georgia border in northwest Florida. The highest official amount was 3.5” at Haywood.

The furthest south snow flakes have been reported is at Homestead (south of Miami 25° 18’ N) on January 19, 1977. The deepest snowfall officially measured in the state is 4.0” at Milton Experimental Station in the NW corner on March 6, 1954.

http://www.wunderground.com/blog/weatherhi...tml?entrynum=11

Modifié 13 janvier 2011 par paix

[sankukay50 0]

En Russie 2010 a été, en effet, une année riche en anomalies de la nature

Excellent présentation avec de belles diaporamas

http://fr.rian.ru/photolents/20101229/188252251.html

[huymétéo 0]

Pour tous ceux qui sont en manque de neige, l'Indiana vient de se prendre le "lake effect" du siècle avec 11 mètres de neige en 48 heures...

Pour les amateurs de données chiffrées :

http://www.wunderground.com/blog/weatherhi...tml?entrynum=11

Hou la doucement, il s'agit de pouces et non de pied ce qui nous vaut quand meme 93cm

[paix 0]

Arf, oui je crois que j'ai fait une petite erreur de conversion

Il est vrai que 11 mètres de neige, cela commence à faire beaucoup