Weather Alerts for Alaska
1. Blizzard Warning for: Kivalina and Red Dog Dock; Baldwin Peninsula
2. Blizzard Warning for: Western Arctic Coast
3. Cold Weather Advisory for: City and Borough of Wrangell
4. Cold Weather Advisory for: Ketchikan Gateway Borough
5. Cold Weather Advisory for: Municipality of Skagway; Haines Borough and Klukwan; City and Borough of Sitka; City and Borough of Juneau; Western Kupreanof and Kuiu Island; City of Hyder; Annette Island
6. Cold Weather Advisory for: Petersburg Borough
7. Cold Weather Advisory for: Prince of Wales Island
8. Winter Storm Warning for: Interior Seward Peninsula; Eastern Norton Sound and Nulato Hills
9. Winter Storm Warning for: Noatak Valley; Lower Kobuk Valley
10. Winter Storm Warning for: Northern Denali Borough
11. Winter Storm Warning for: South Slopes of the Western Brooks Range; Upper Kobuk Valleys
12. Winter Storm Warning for: Tanana Flats; Eielson AFB and Salcha
13. Winter Storm Warning for: Upper Koyukuk Valley
14. 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
15. Winter Weather Advisory for: Central Brooks Range
16. Winter Weather Advisory for: Lower Koyukuk Valley; Middle Yukon Valley
17. Winter Weather Advisory for: Lower Yukon River
18. Winter Weather Advisory for: Northern Seward Peninsula
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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 are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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