Weather Alert in Alaska
Flood Advisory issued August 27 at 2:24PM AKDT until August 30 at 12:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Kobuk Valleys
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is occurring. * WHERE...Kobuk River at Kobuk. * WHEN...Until noon AKDT Saturday. * IMPACTS...Minor flooding in low-lying and poorly drained areas. The old road is flooded and water levels are near new road. * ADDITIONAL DETAILS... - As of Wednesday morning, the public has reported minor flooding in Kobuk. Between 3 and 5 inches of rain have fallen since Monday. Additional rainfall amounts of 1 to 2 inches are possible through Friday. - http://www.weather.gov/aprfc
INSTRUCTION: Continue to monitor river levels and take appropriate actions to protect lives and property.
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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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