Weather Alert in Alaska
Flood Advisory issued June 22 at 8:30AM AKDT until June 25 at 12:00PM AKDT by NWS Anchorage AK
AREAS AFFECTED: Lower Matanuska Valley
DESCRIPTION: * WHAT...Flooding caused by snowmelt and channel shift. * WHERE...Matanuska River near Butte, AK. * WHEN...Until noon AKDT Wednesday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 817 AM AKDT, Warm temperatures and bank erosion have led to high water breaking through the banks of the Matanuska River between the Old Glenn Highway and the River in the Maud Road area. Water levels are expected to be near peak levels Saturday evening and then very slowly recede over the next few days as temperatures drop and lessens the snow melt in the mountains upriver. However, since this is largely driven by new erosion along the riverbank, persons in this area should continue to monitor the situation. - For Matanuska River at Palmer/Butte: At 7:30am the stage was 24200.0 cfs. Forecast: A crest around 24400.0 cfs is expected around 4:00pm Sunday. - 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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