Weather Alerts for Alaska
1. Cold Weather Advisory for: Kuskokwim Valley West; Kuskokwim Valley East; Lime Village
2. Cold Weather Advisory for: North Slopes of the Western Alaska Range
3. Cold Weather Advisory for: Southern Denali Borough; Eastern Alaska Range South of Trims Camp
4. Cold Weather Advisory for: Upper Tanana Valley
5. Extreme Cold Watch for: Southern Kenai Mtns
6. Extreme Cold Watch for: Sutton / Upper Matanuska Valley; Eureka / Tahneta Pass; West Prince William Sound & Whittier; Northern Copper Valley; Western Copper Valley; Central Copper Valley; Ernestine; Northern Susitna Valley; Southern Copper Valley; Tok Cutoff; McCarthy
7. High Wind Warning for: Kodiak Island Northeast
8. High Wind Warning for: Southern Kenai Mtns
9. High Wind Warning for: Thompson Pass
10. Special Weather Statement for: Central Aleutians
11. Wind Advisory for: Valdez
12. Winter Weather Advisory for: Cape Fairweather to Lisianski Strait
13. Winter Weather Advisory for: City and Borough of Juneau
14. Winter Weather Advisory for: City and Borough of Sitka; Prince of Wales Island
15. Winter Weather Advisory for: Municipality of Skagway
16. Winter Weather Advisory for: Petersburg Borough
17. Winter Weather Advisory for: Tok Cutoff
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North America Water Vapor (Moisture)
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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