Weather Alert in Alaska
Winter Weather Advisory issued February 23 at 3:34PM AKST until February 25 at 3:00PM AKST by NWS Fairbanks AK
AREAS AFFECTED: Upper Tanana Valley; Delta Junction; Eastern Alaska Range North of Trims Camp
DESCRIPTION: * WHAT...Snow and blowing snow expected. Total snow accumulations between 4 and 7 inches. Winds gusting as high as 45 mph. Areas of blowing snow may reduce visibility to 1/2 mile or less at times. * WHERE...Delta Junction, Eastern Alaska Range North of Trims Camp, and Upper Tanana Valley. * WHEN...Until 3 PM AKST Wednesday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Multiple days of light snow expected. Northwesterly winds increase late Monday into Tuesday increasing the chances of blowing snow hazards.
INSTRUCTION: Slow down and use caution while traveling. Visit 511.alaska.gov or call 5 1 1 for the latest road conditions.
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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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