Weather Alert in Alaska
Winter Weather Advisory issued March 20 at 4:38AM AKDT until March 20 at 5:00PM AKDT by NWS Anchorage AK
AREAS AFFECTED: Kuskokwim Delta Coast and Nunivak Island; Western Capes
DESCRIPTION: * WHAT...Blowing snow. Winds gusting as high as 35 mph. Visibility reduced to one-half mile or less at times. * WHERE...Kuskokwim Delta Coast and Nunivak Island and Western Capes. * WHEN...Until 5 PM AKDT this afternoon. * IMPACTS...Visibilities reduced to one half mile or less due to blowing snow. * ADDITIONAL DETAILS...The worst conditions are expected along the coast near Platinum and between Kipnuk and Toksook Bay. Areas of blowing snow could persist along the coast through this weekend as northerly winds slowly decrease.
INSTRUCTION: Use caution while traveling, especially in open areas.
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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