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 are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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