Weather Alert in Alaska
Flood Advisory issued August 29 at 9:21PM AKDT until August 30 at 10:00AM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Northern Denali Borough
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Sanctuary River near Denali Park Road * WHEN...Until 1000 AM AKDT Saturday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - As of 900 PM AKDT, river gauge continues to show minor flooding from rain-induced rises in waters on the Sanctuary River at Denali Park Road, with water levels at 10 feet and dropping. Minor flooding is likely to continue through the day on Saturday, with more uncertainty heading into the latter half of this Labor Day Weekend. - 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 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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