Weather Alert in Alaska
Cold Weather Advisory issued February 24 at 3:58PM 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 6 PM Wednesday to 6 PM AKST Thursday. * 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 evening and Tuesday night, then peak 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 night could result in hypothermia or frostbite if precautions are not taken.
INSTRUCTION: A cold weather advisory means that a period of very cold temperatures and wind chills are expected. 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 Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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