Weather Alerts for Alaska
1. Blizzard Warning for: Lower Kobuk Valley; Baldwin Peninsula; Northern Seward Peninsula
2. Blizzard Warning for: Shishmaref; Bering Strait Coast; Southern Seward Peninsula Coast; Interior Seward Peninsula; Eastern Norton Sound and Nulato Hills
3. Blizzard Warning for: St Lawrence Island
4. Flood Watch for: Western Susitna Valley; Southern Susitna Valley; Central Susitna Valley
5. Wind Advisory for: Eastern Alaska Range North of Trims Camp
6. Wind Advisory for: Northern Denali Borough
7. Winter Weather Advisory for: Central Brooks Range
8. Winter Weather Advisory for: Dalton Highway Summits
9. Winter Weather Advisory for: Western Arctic Coast
10. Winter Weather Advisory for: Yukon Delta Coast; Lower Yukon River
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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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