Weather Alert in Alaska
Flood Warning issued August 28 at 6:08PM AKDT until August 31 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 continues. * WHERE...the Yentna River and tributaries at and above Lake Creek. * WHEN...Until 1000 AM AKDT Sunday. * IMPACTS...At 20.5 feet, water begins to inundate several low-lying cabins. At 22.0 feet, more extensive flooding of cabins, resorts, and private property. * ADDITIONAL DETAILS... - At 545 PM AKDT, Between 1 and 2 inches of rain have fallen. The river gage at Lake Creek and other gages across the Susitna Valley show considerable rises across area rivers. Additional rainfall amounts of around an inch are expected. For Yentna River at Lake Creek: At 5:00pm the stage was 20.9 feet and rising. Flood Stage is 20.5 feet. Forecast: A crest around 23 feet is expected around Friday night into early Saturday morning with an estimated crest time at 4 am Saturday. The river will then begin to fall and is expected to go below flood stage Sunday. This may equal or exceed the August 2024 crest of 22.4 feet. - 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 is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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