Weather Alert in Alaska
Winter Storm Watch issued August 26 at 10:01PM AKDT until August 28 at 10:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Western Arctic Plains; Howard Pass and the Delong Mountains
DESCRIPTION: * WHAT...Ice accumulations of 0.1" to 0.25" are possible. * WHERE...Howard Pass and the Delong Mountains and Western Arctic Plains. * WHEN...From late Wednesday night through Thursday evening. * IMPACTS...Ice accumulations will lead to hazardous travel conditions and very slick surfaces. Significant ice accumulation on power lines may cause power outages. * ADDITIONAL DETAILS...The greatest ice accumulations are expected along the northern slopes of the Northwestern Brooks Range and Western Arctic Coastal Plains. There is high uncertainty in potential ice amounts extending northeast of this location, though ice accumulations Thursday into Thursday night appear increasingly possible as far northeast as Nuiqsut, Prudhoe Bay, and the northern extent of the Dalton Highway.
INSTRUCTION: Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary.
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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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