Weather Alert in Alaska
Flood Advisory issued September 10 at 4:06PM AKDT until September 13 at 10:00AM AKDT by NWS Anchorage AK
AREAS AFFECTED: Western Susitna Valley; Southern Susitna Valley; Central Susitna Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...the Yentna River near Lake Creek. * WHEN...Until 1000 AM AKDT Saturday. * IMPACTS...At 20.5 feet, water begins to inundate several low-lying cabins. * ADDITIONAL DETAILS... - At 252 PM AKDT, the YLKA2 river gauge indicated rises in water levels from heavy rain across the advisory area. Water levels at the Yentna River near Lake Creek are near bankfull. Minor flooding in low lying areas is expected to begin late Thursday evening. - At 1:00 PM AKDT, Between 0.5 and 1 inch of rain have fallen. Additional rainfall amounts of 1 to 2 inches are possible. The river level is at Action Stage and is expected to reach Minor Flood stage at 10 PM AKDT Thursday. Forecast: A crest around 20.8 feet is expected late Friday morning with an estimated crest time at 10 AM AKDT Friday. The river will then begin to fall and is expected to go below flood stage by Saturday morning. - 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 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
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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