Weather Alert in Alaska
Flood Warning issued August 29 at 11:04PM AKDT until August 30 at 11:00PM AKDT by NWS Anchorage AK
AREAS AFFECTED: Central Susitna Valley; Northern Susitna Valley
DESCRIPTION: * WHAT...Flooding caused by previous excessive rainfall is expected. * WHERE...Talkeetna River. * WHEN...Until 1100 PM AKDT Saturday. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS... - At 1052 PM AKDT, river gauge reports indicate rises in water levels from previous days heavy rain across the warned area. Flooding is ongoing or expected to begin shortly, especially near and along the Talkeetna River. - For Talkeetna River Upstream of Talkeetna: At 9:45pm the stage was 12.1 feet. Flood Stage is 12.5 feet. Forecast: A crest around 12.7 feet is expected around 4:00am Saturday. - For Talkeetna River at the Talkeetna Railroad Bridge: At 10:00pm the stage was 14.82 feet. Major Flood Stage is 15.0 feet. The river is expected to crest early Saturday just above Major Flood Stage then begin to fall. - For Susitna River near Sunshine: At 10:00pm the stage was 25.9 feet. Flood Stage is 24.5 feet. Forecast: A crest around 25.4 feet is expected around 10:00am Saturday. - Http://www.weather.gov/safety/flood
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?
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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
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Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
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Weather Topic: What are Altostratus Clouds?
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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.
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