Weather Alert in Alaska
Flood Advisory issued August 28 at 8:21AM AKDT until August 29 at 12:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Koyukuk Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Koyukuk River at Allakaket. * WHEN...Until noon AKDT Friday. * IMPACTS...Minor flooding in low-lying and poorly drained areas. Water over roadways may cut off access to the downtown area and possibly to the runway. * ADDITIONAL DETAILS... - At 819 AM AKDT, the public has reported minor flooding in Allakaket with river levels expected to continue to rise through Thursday morning. Between 3 and 5 inches of rain have fallen. Additional rainfall amounts of 1 to 2 inches are possible through Friday. The Koyukuk River at Allakaket is expected to crest late Wednesday or early Thursday. The timing of the crest of the Alatna River at the confluence with the Koyukuk River is uncertain due to the lack of streamgage data, but could occur coincidentally with the Koyukuk crest. - http://www.weather.gov/aprfc
INSTRUCTION: Be aware of your surroundings and do not drive on flooded roads.
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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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