Weather Alert in Alaska
Special Weather Statement issued August 1 at 11:09AM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Tanana Valley; Eastern Alaska Range North of Trims Camp; Eastern Alaska Range South of Trims Camp
DESCRIPTION: A system bringing abundant rainfall will move quickly from east to west across the Upper Tanana Valley and Alaska Range Friday evening into Saturday. Rainfall rates of 1" per hour are possible from 7pm Friday evening through around 10am Saturday morning. Rainfall will begin along the Alaska Highway near the Alcan Border and move west to Dry Creek and over the eastern Alaska Range overnight. Short run creeks along the Alaska Highway from Dot lake to Tok may run high and fast, as well as streams draining the Macomb Plateau. Outdoor recreationists should be aware of the threat for heavy rain, high water, and debris flowing down typically dry streambeds.
INSTRUCTION: N/A
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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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