Weather Alert in Alaska
Flood Warning issued August 31 at 9:26PM AKDT until September 2 at 4:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Lower Koyukuk Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Koyukuk River near Hughes. * WHEN...Until 400 PM AKDT Tuesday. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS... - As of 923 PM AKDT, the Koyukuk River at Hughes was observed to be in minor flood stage by the KRHA2 river gauge. - The gauge at Hughes reported a stage of 64.49 feet, minor flood stage is 64.0 feet and a crest of 64.72 feet is expected by 4 AM AKDT Monday. The river is forecasted to remain in minor flood stage until Monday morning when it should drop to action stage. There will be additional rainfall of 0.5 to 1.5 inches through the holiday weekend, so while the river will be dropping on Monday, there may be another crest on Tuesday or Wednesday this upcoming week. - http://www.weather.gov/aprfc
INSTRUCTION: Stay tuned to further developments by listening to your local radio, television, or NOAA Weather Radio for further information.
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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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