Weather Alert in Alaska
Hydrologic Outlook issued August 28 at 8:21AM AKDT by NWS Fairbanks AK
AREAS AFFECTED: South Slopes Of The Central Brooks Range; South Slopes of the Western Brooks Range; Noatak Valley; Lower Kobuk Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley
DESCRIPTION: ESFAFG The headwater tributaries of the Koyukuk, Kobuk and Noatak Rivers have received substantial rainfall in the last several days leading to record crests at Slate Creek near Coldfoot (30 years of record) and Dahl Creek near Kobuk (39 years of record). An additional 0.5" to 1.5" of rainfall is expected to continue in the Western and Central Brooks Range through Friday, keeping water levels on rivers high and continued standing water in poorly drained areas. The crests from the early week rainfall are making their way down the main stems of the Kobuk, Koyukuk, and Noatak Rivers through the end of the week. Expect river levels to remain high through the weekend.
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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