Weather Alerts for Alaska
1. Cold Weather Advisory for: Kuskokwim Valley West; Kuskokwim Valley East; Lime Village
2. Cold Weather Advisory for: North Slopes of the Western Alaska Range
3. Cold Weather Advisory for: Southern Denali Borough; Eastern Alaska Range South of Trims Camp
4. Cold Weather Advisory for: Southern Kenai Mtns
5. Cold Weather Advisory for: Sutton / Upper Matanuska Valley; Eureka / Tahneta Pass; West Prince William Sound & Whittier; Northern Copper Valley; Western Copper Valley; Central Copper Valley; Ernestine; Northern Susitna Valley; Southern Copper Valley; Tok Cutoff; McCarthy
6. Cold Weather Advisory for: Upper Tanana Valley
7. High Wind Warning for: Kodiak Island Northeast
8. High Wind Warning for: Southern Kenai Mtns
9. High Wind Warning for: Thompson Pass
10. Special Weather Statement for: Central Aleutians
11. Wind Advisory for: Valdez
12. Winter Weather Advisory for: Cape Fairweather to Lisianski Strait
13. Winter Weather Advisory for: City and Borough of Juneau
14. Winter Weather Advisory for: City and Borough of Sitka; Prince of Wales Island
15. Winter Weather Advisory for: Municipality of Skagway
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Current U.S. National Radar--Current
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National Weather Forecast for Tomorrow
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North America Water Vapor (Moisture)
This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.
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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