Weather Alert in Alaska
Extreme Cold Watch issued February 24 at 10:04AM AKST until February 26 at 6:00PM AKST by NWS Anchorage AK
AREAS AFFECTED: Sutton / Upper Matanuska Valley; Eureka / Tahneta Pass; West Prince William Sound & Whittier; Northern Copper Valley; Western Copper Valley; Central Copper Valley; Ernestine; Northern Susitna Valley; Southern Copper Valley; Tok Cutoff; McCarthy
DESCRIPTION: * WHAT...Dangerously cold wind chills as low as 20 below possible for areas along the coast, including Whittier. Dangerously cold wind chills as low as 40 below to 50 below possible for Copper River Basin, northern Susitna Valley, and Upper Matanuska Valley. * WHERE...Copper River Basin, Sutton, Upper Matanuska Valley, Eureka, Tahneta Pass, West Prince William Sound & Whittier, and Northern Susitna Valley. * WHEN...From Wednesday evening through Thursday afternoon. * IMPACTS...For areas along the coast, dangerously cold wind chills as low as 20 below zero could cause frostbite on exposed skin in as little as 20 minutes. For interior valleys, wind chills as low as 50 below zero could cause frostbite on exposed skin in as little as 5 minutes. * ADDITIONAL DETAILS...Northerly winds will rapidly strengthen Tuesday afternoon and evening, then peak Tuesday night through Wednesday. Winds will then begin to slowly diminish Wednesday night through Thursday. Wind chills as low as 20 to 50 below zero overnight Wednesday could result in hypothermia or frostbite if precautions are not taken.
INSTRUCTION: An extreme cold watch means that a period of very cold temperatures are possible. Wear protective clothing such as a hat, face mask, and heavy gloves or mittens if you have plans to be outdoors. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly.
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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