Weather Alert in Alaska
Flood Warning issued August 30 at 12:05PM AKDT until September 2 at 4:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Lower Koyukuk Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is expected. * 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... - At 1130 AM AKDT, - The gauge at Hughes reported a stage of 63.9 feet, minor flood stage is 64.0 feet and we expect a crest at 64.24 feet by 10 AM Sunday. - The river is forecasted to be above 64 feet through early Monday morning, then we begin to see it drop below minor flood stage. - There will be additional rainfall arriving Sunday and Monday, so while the river will be dropping on Monday, there may be another crest on Tuesday. - 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 Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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