Weather Alert in Alaska
Winter Weather Advisory issued February 17 at 3:04PM AKST until February 18 at 3:00AM AKST by NWS Anchorage AK
AREAS AFFECTED: Kuskokwim Delta Coast and Nunivak Island; Interior Kuskokwim Delta
DESCRIPTION: * WHAT...Snow and blowing snow expected. Total snow accumulations between 2 and 4 inches. Winds gusting as high as 45 mph. * WHERE...Kuskokwim Delta. * WHEN...Until 3 AM AKST Wednesday. * IMPACTS...Visibilities reduced to one half mile or less due to blowing snow. Travel could be very difficult. Gusty winds could blow around unsecured objects. * ADDITIONAL DETAILS...A front will bring a round of moderate snowfall and gusty winds this afternoon. Blowing snow could significantly reduce visibility. The front moves out by early Wednesday morning, allowing conditions to improve.
INSTRUCTION: Slow down and use caution while traveling.
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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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