Weather Alerts for Alaska
1. High Wind Warning for: Annette Island
2. High Wind Warning for: Prince of Wales Island
3. Wind Advisory for: City and Borough of Sitka
4. Wind Advisory for: Western Kupreanof and Kuiu Island; Ketchikan Gateway Borough
5. Winter Storm Warning for: Admiralty Island
6. Winter Storm Warning for: Cape Fairweather to Lisianski Strait
7. Winter Storm Warning for: City of Hyder
8. Winter Storm Warning for: Glacier Bay; Eastern Chichagof Island; City and Borough of Juneau
9. Winter Storm Warning for: Municipality of Skagway; Haines Borough and Klukwan
10. Winter Storm Warning for: Petersburg Borough
11. Winter Storm Warning for: Prince of Wales Island
12. Winter Storm Watch for: Southern Denali Borough; Eastern Alaska Range South of Trims Camp
13. Winter Weather Advisory for: Cape Fairweather to Lisianski Strait
14. Winter Weather Advisory for: Central Beaufort Sea Coast; Eastern Beaufort Sea Coast
15. Winter Weather Advisory for: City and Borough of Sitka
16. Winter Weather Advisory for: City and Borough of Sitka
17. Winter Weather Advisory for: City and Borough of Yakutat
18. Winter Weather Advisory for: Ketchikan Gateway Borough; Annette Island
19. Winter Weather Advisory for: Shishmaref; Bering Strait Coast
20. Winter Weather Advisory for: Western Kupreanof and Kuiu Island; City and Borough of Wrangell
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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)
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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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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