Weather Alert in Alaska
Winter Storm Warning issued February 22 at 8:43AM AKST until February 24 at 12:00AM AKST by NWS Fairbanks AK
AREAS AFFECTED: Yukon Delta Coast; Lower Yukon River; Lower Yukon and Innoko Valleys
DESCRIPTION: * WHAT...Heavy mixed precipitation expected. Total snow accumulations up to 6 inches and ice accumulations up to 0.05 inches. * WHERE...Lower Yukon River, Lower Yukon and Innoko Valleys, and Yukon Delta Coast. * WHEN...Until midnight AKST Monday Night. * IMPACTS...Travel may be difficult. * ADDITIONAL DETAILS...Heavier precipitation begins Sunday morning starting mostly as rain or a wintry mix and eventually switching back to mostly snow Monday afternoon. Much of the precipitation will be rain that is expected to freeze on the ground, but not along power lines and other elevated surfaces. Temperatures cool rapidly Tuesday and Wednesday causing wet surfaces to freeze.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency.
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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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