Weather Alert in Alaska
Wind Advisory issued February 18 at 10:57AM AKST until February 20 at 6:00PM AKST by NWS Anchorage AK
AREAS AFFECTED: Southern Kenai Mtns; West Prince William Sound & Whittier
DESCRIPTION: * WHAT...North to west winds 30 to 45 mph with gusts up to 60 mph expected. Wind chill readings dropping to zero to 15 below zero by Friday morning. * WHERE...Seward (and vicinity) and Whittier. * WHEN...From 1 PM Thursday to 6 PM AKST Friday. * IMPACTS...Gusty winds will blow around unsecured objects and a few power outages may result. The very cold wind chills as low as 15 below zero could result in hypothermia or frostbite if precautions are not taken. * ADDITIONAL DETAILS...Winds will strengthen late tonight through the day Thursday and peak Thursday night through Friday morning. Winds will then very gradually diminish through Saturday. The coldest wind chill temperatures will be Friday morning through Saturday morning.
INSTRUCTION: Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.
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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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