查看完整版本 : 美國五月暴風雪

omegatorque 2013-5-4 09:15 AM

美國五月暴風雪

[b]香港有九十年以來最冷五月二日,屬於弱冷空氣。[/b][b]同時美國有另一波強冷空氣,帶來暴風雪。[/b]

阿肯色州 2013.05.03
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[b]
原文:[/b][b]http://www.wunderground.com/news/winter-storms-achilles-10-strangest-20130502[/b]
[b]Winter Storm Achilles[/b] is an historic, record-breaking May snowstorm for the Midwest. We have a look at 10 of the most amazing aspects of this storm ranging from extreme temperatures to where we've seen record snowfall. We begin with a city that went from feeling summer heat to shivering like it was the heart of winter.

On the final two days of April, [url=http://www.wunderground.com/q/zmw:79111.1.99999]Amarillo, Texas[/url] saw temperatures rise well into the 90s. A record high temperature of [b]97 degrees[/b] was set on April 30.
A little more than 24 hours later on the evening of May 1, temperatures in this Texas Panhandle city plummeted into the 30s before bottoming out at 33 degrees on the morning of May 2. The wind chill at the time was [b]19 degrees[/b]!

[img]http://i.imwx.com/web/news/animated-temp-ama.gif[/img]

It's not just the Midwest that has seen double-digit snowfall totals from Achilles.

Parts of the Rockies and Front Range saw the snow first, although it's not that unusual to see significant early May snow in this region.

That said, Fort Collins, Colo. reported 12.8 inches of snow on May 1. This was the second snowiest May calendar day in Fort Collins in records dating back to 1893. The heavy, wet nature of the snow broke tree branches and caused some power outages.

The top snow total in Colorado was 28.2 inches near Buckhorn Mountain.

Winter Storm Achilles may have set the record for the biggest May snowstorm at any single location in four different states! That said, these potential records are based on preliminary data and will have to be verified.

Wisconsin - We've seen snowfall reports of 18 inches near Hayward and 17 inches in Rice Lake. These amounts exceed the May record 1-day (10.9 inches in Pine River), 2-day (15.4 inches near Bayfield) and 3-day (15.4 inches near Bayfield) snowfalls for any single location in Wisconsin.

Minnesota - 18 inches of snow was measured in Blooming Prairie, between Albert Lea and Rochester. This snow total exceeds the May record 1-day (12 inches in Windom), 2-day (12.1 inches at Owatonna) and 3-day (15 inches at Sandy Lake Dam/Libby) snowfalls for any single location in Minnesota.

Iowa - 13 inches of snow has been measured by an observer in Osage. This snow total exceeds the May record 1-day (8 inches at Denison, Cherokee, Glenwood), 2-day (8 inches at Belle Plaine, Cherokee, Denison, Glenwood) and would tie the 3-day (13 inches near Mason City) snowfalls for any single location in Iowa.

Arkansas - Up to 5 inches reported near Decatur. No snowfall has ever been recorded in the state during the month of May prior to Achilles.
Usually we're more concerned with severe thunderstorms in the southern Plains in early May.  More on that later.
For a two-hour period early on May 2, 2013, light snow and flurries fell as far south as Childress, Texas.  
While the snow did not accumulate, there, it's noteworthy that dating to 1893, there is no record of accumulating May snowfall in Childress.  
Snow in the Texas Panhandle in May is not unprecedented, however.  Amarillo, Texas has had four separate May snow events dating to 1892, most recently a 4.7 inch snowfall on May 2, 2005.
First came the heavy snow.  Cheyenne, Wyo. picked up 12.8" from Apr. 30 - May 1 from [url=http://www.weather.com/news/weather-forecast/winter-storm-achilles-20130430]Winter Storm Achilles[/url].  
Then a mid-winter chill...in early May.
Morning lows on May 2 bottomed out at 5 degrees in nearby [url=http://www.wunderground.com/q/zmw:82070.1.99999]Laramie, Wyo.[/url] shattering the old May monthly record of 9 degrees set almost five years ago (May 3, 2008).  
Morning wind chills approached 10 degrees [b]below zero[/b] in southeast Wyoming!
[url=http://www.wunderground.com/q/zmw:80247.1.99999]Denver, Colo.[/url] tied its May monthly record low set back in May 3, 1907 (19 degrees).  These are among the lowest average daily low temperatures in the Mile-High City from late November through mid-February.
[url=http://www.wunderground.com/q/zmw:79403.1.99999]Lubbock, Texas[/url] (27 degrees) and [url=http://www.wunderground.com/q/zmw:79703.1.99999]Midland, Texas[/url] (33 degrees) both broke their all-time record lows for the month of May on Friday morning.
Other May record lows on May 3 were tied or broken in [url=http://www.wunderground.com/q/zmw:79602.1.99999]Abilene, Texas[/url] (33), [url=http://www.wunderground.com/q/zmw:77551.1.99999]Galveston, Texas[/url] (50), [url=http://www.wunderground.com/q/zmw:71109.1.99999]Shreveport, La.[/url] (41) and [url=http://www.wunderground.com/q/zmw:57501.1.99999]Pierre, S.D.[/url] (21).
We thought it was strange when a mid-April winter storm, [url=http://www.weather.com/news/winter/storms/2012/walda]Winter Storm Walda[/url], brought a round of freezing rain to southeast South Dakota, among other areas, April 9, knocking out power to tens of thousands of customers, some for several days, in Sioux Falls.

Now, [url=http://www.weather.com/news/weather-forecast/winter-storm-achilles-20130430]Winter Storm Achilles[/url] produced freezing rain as far south as Harrison, Ark. early on May 3, 2013.  For perspective, the average high in Harrison on May 3 is 73, the average low is 52.  Oh yes, and there had been no record of any May snowfall anywhere in the state of Arkansas prior to this storm.
Freezing rain overnight on May 2 into May 3 coated cars in La Crosse, Wisc.  Heavy sleet accumulated on roads north of Tomahawk, Wisc.  One-eighth inch of ice accumulated in elevated surfaces in Alger County, Mich.

[[i] 本帖最後由 omegatorque 於 2013-5-4 09:33 AM 編輯 [/i]]

reonlucky 2013-5-4 01:42 PM

想不到美國也遭受強冷空氣....

其實是否與西風活動及東亞大槽的分佈影響呢?

as56as5 2013-5-4 03:02 PM

六月飛霜:smile_15:

omegatorque 2013-5-4 03:37 PM

[quote]原帖由 [i]reonlucky[/i] 於 2013-5-4 01:42 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=360443740&ptid=21857208][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
想不到美國也遭受強冷空氣....

其實是否與西風活動及東亞大槽的分佈影響呢? [/quote]
有冷源就有冷空氣,這很正常。暖區上空暖脊把冷空氣引導去某些冷源以外的地方,即此而已,

[attach]2465177[/attach]

k1k2k 2013-5-8 01:39 PM

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