Weather Alert in Alaska
Cold Weather Advisory issued February 28 at 2:43PM AKST until March 1 at 11:00AM AKST by NWS Anchorage AK
AREAS AFFECTED: SW Kenai Peninsula; Southern Kenai Mtns; West Prince William Sound & Whittier; Valdez
DESCRIPTION: * WHAT...Very cold wind chills of 10 below to 25 below zero expected. * WHERE...Southwest Kenai Peninsula, Seward and vicinity, Whittier, and Valdez. * WHEN...From 8 PM this evening to 11 AM AKST Sunday. * IMPACTS...The very cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 20 minutes. Frostbite and hypothermia are likely if exposed to these temperatures. * ADDITIONAL DETAILS...Northerly winds (except westerly winds in Whittier) will strengthen this evening into the overnight hours, leading to rapidly falling wind chills. Winds will slowly diminish on Sunday.
INSTRUCTION: Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.
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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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