Weather Alerts for Alaska
1. Dense Fog Advisory for: Ketchikan Gateway Borough; Annette Island
2. Flood Advisory for: Southern Susitna Valley; Central Susitna Valley
3. Flood Advisory for: Upper Kobuk Valleys
4. Flood Advisory for: Western Susitna Valley; Central Susitna Valley
5. Flood Warning for: Lower Koyukuk Valley
6. Flood Warning for: Upper Koyukuk Valley
7. Flood Warning for: Western Susitna Valley; Southern Susitna Valley; Central Susitna Valley
8. Flood Watch for: South Slopes of the Western Brooks Range; Noatak Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley
9. Hydrologic Outlook for: Fairbanks Metro Area
10. Hydrologic Outlook for: Fairbanks Metro Area
11. Hydrologic Outlook for: Northern Bristol Bay Coast
12. Hydrologic Outlook for: South Slopes Of The Central Brooks Range; South Slopes of the Western Brooks Range; Noatak Valley; Lower Kobuk Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley
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North America Water Vapor (Moisture)
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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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
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