Weather Alerts for Alaska
1. High Wind Watch for: Kodiak Island Northeast
2. High Wind Watch for: Thompson Pass
3. Special Weather Statement for: City and Borough of Juneau
4. Wind Advisory for: Southern Kenai Mtns; West Prince William Sound & Whittier
5. Wind Advisory for: Upper Tanana Valley
6. Wind Advisory for: Valdez
7. Winter Storm Warning for: Cape Fairweather to Lisianski Strait
8. Winter Storm Warning for: City and Borough of Sitka
9. Winter Storm Warning for: City and Borough of Yakutat
10. Winter Storm Warning for: Northern Denali Borough
11. Winter Storm Warning for: Prince of Wales Island
12. Winter Storm Warning for: Upper Koyukuk Valley
13. Winter Storm Warning for: White Mountains and High Terrain South of the Yukon River; Upper Chena River Valley; Tanana Flats; Eielson AFB and Salcha; Goldstream Valley and Nenana Hills; Chatanika River Valley; Two Rivers; Fairbanks Metro Area; Nenana; Central Interior
14. Winter Storm Watch for: Noatak Valley; Kivalina and Red Dog Dock; Lower Kobuk Valley; Baldwin Peninsula
15. Winter Storm Watch for: Northern Seward Peninsula; Shishmaref; Bering Strait Coast; Southern Seward Peninsula Coast; Interior Seward Peninsula
16. Winter Storm Watch for: Western Arctic Coast
17. Winter Weather Advisory for: City and Borough of Juneau
18. Winter Weather Advisory for: Glacier Bay; Eastern Chichagof Island; Admiralty Island
19. Winter Weather Advisory for: Ketchikan Gateway Borough; Annette Island
20. Winter Weather Advisory for: Petersburg Borough; Western Kupreanof and Kuiu Island; City and Borough of Wrangell
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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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