Weather Alerts for Alaska
1. Blizzard Warning for: Kivalina and Red Dog Dock; Baldwin Peninsula
2. Blizzard Warning for: Shishmaref; Bering Strait Coast; Southern Seward Peninsula Coast; Yukon Delta Coast; St Lawrence Island
3. Blizzard Warning for: Western Arctic Coast
4. Cold Weather Advisory for: City and Borough of Juneau
5. Cold Weather Advisory for: City and Borough of Wrangell
6. Cold Weather Advisory for: Ketchikan Gateway Borough
7. Cold Weather Advisory for: Municipality of Skagway; Haines Borough and Klukwan; City and Borough of Sitka; City of Hyder
8. Cold Weather Advisory for: Petersburg Borough
9. Cold Weather Advisory for: Prince of Wales Island
10. Cold Weather Advisory for: Western Kupreanof and Kuiu Island; Annette Island
11. Winter Storm Warning for: Interior Seward Peninsula; Eastern Norton Sound and Nulato Hills
12. Winter Storm Warning for: Noatak Valley; Lower Kobuk Valley
13. Winter Storm Warning for: South Slopes of the Western Brooks Range; Upper Kobuk Valleys
14. Winter Storm Warning for: Upper Koyukuk Valley
15. Winter Storm Warning for: White Mountains and High Terrain South of the Yukon River; Upper Chena River Valley; Goldstream Valley and Nenana Hills; Chatanika River Valley; Two Rivers; Fairbanks Metro Area; Nenana; Central Interior
16. Winter Weather Advisory for: Central Brooks Range
17. Winter Weather Advisory for: Kuskokwim Delta Coast and Nunivak Island; Interior Kuskokwim Delta
18. Winter Weather Advisory for: Lower Koyukuk Valley; Middle Yukon Valley
19. Winter Weather Advisory for: Lower Yukon River
20. Winter Weather Advisory for: Northern Seward Peninsula
21. Winter Weather Advisory for: Tanana Flats; Eielson AFB and Salcha; Northern Denali Borough
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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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