Weather Alert in Alaska
Flood Advisory issued September 2 at 11:43AM AKDT until September 3 at 4:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Koyukuk Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Koyukuk River near Allakaket. * WHEN...Until 400 PM AKDT Wednesday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - As of 1130 AM Tuesday,there have been reports of water levels receding, although some low lying roads remain inundated. - River gauges upstream and downstream of Allakaket are showing decreasing water levels with water levels at Allakaket expected to continue to decrease. Additional rain is expected Wednesday through Thursday with half an inch to an inch expected. This is not expected to create any new impacts. - 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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