Weather Alert in Alaska
Cold Weather Advisory issued February 18 at 6:07AM AKST until February 18 at 9:00AM AKST by NWS Juneau AK
AREAS AFFECTED: Municipality of Skagway; Haines Borough and Klukwan; City and Borough of Juneau; Petersburg Borough; Western Kupreanof and Kuiu Island; City of Hyder; Annette Island
DESCRIPTION: * WHAT...Dangerously cold wind chill temperatures as low as 0 to 35 below with the coldest wind chills in the north. * WHERE...Klondike Highway, Haines Highway, Juneau, Sitka, Kake, Hyder and Metlakatla. * WHEN...Until 9 AM AKST this morning. * IMPACTS...Frostbite and hypothermia are possible if exposed to these temperatures. * ADDITIONAL DETAILS...Occasional gusts to 35 or 40 mph possible around along the Klondike Highway and near Downtown Juneau and Douglas. Coldest wind chills of 20 to 30 below will be along the Haines and Klondike Highways. The other areas will have wind chills of 0 to 10 below.
INSTRUCTION: N/A
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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