Weather Alerts for Alaska
1. Air Quality Alert for: Fairbanks Metro Area
2. Blizzard Warning for: Central Beaufort Sea Coast
3. Blizzard Warning for: Eastern Beaufort Sea Coast
4. Cold Weather Advisory for: Central Brooks Range; Romanzof Mountains
5. Cold Weather Advisory for: Kuskokwim Delta Coast and Nunivak Island; Interior Kuskokwim Delta
6. Cold Weather Advisory for: Northern Copper Valley; Western Copper Valley; Central Copper Valley; Ernestine; Southern Copper Valley; Tok Cutoff; McCarthy
7. Cold Weather Advisory for: South Slopes Of The Eastern Brooks Range; South Slopes Of The Central Brooks Range
8. Cold Weather Advisory for: SW Kenai Peninsula; Southern Kenai Mtns; West Prince William Sound & Whittier; Valdez
9. Cold Weather Advisory for: Thompson Pass
10. Wind Advisory for: Municipality of Skagway
11. Winter Storm Warning for: City and Borough of Juneau
12. Winter Storm Warning for: City and Borough of Wrangell
13. Winter Storm Warning for: City of Hyder
14. Winter Storm Warning for: Glacier Bay; Eastern Chichagof Island; Cape Fairweather to Lisianski Strait
15. Winter Storm Warning for: Petersburg Borough
16. Winter Storm Warning for: Petersburg Borough
17. Winter Weather Advisory for: Admiralty Island
18. Winter Weather Advisory for: City and Borough of Sitka
19. Winter Weather Advisory for: City and Borough of Sitka
20. Winter Weather Advisory for: City and Borough of Wrangell
21. Winter Weather Advisory for: Prince of Wales Island
22. Winter Weather Advisory for: Prince of Wales Island
23. Winter Weather Advisory for: Western Kupreanof and Kuiu Island
24. Winter Weather Advisory for: Western Kupreanof and Kuiu Island
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Current U.S. National Radar--Current
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National Weather Forecast--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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