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 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.
Next Topic: Rain
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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