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 is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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