Weather Alert in Alaska
Flood Advisory issued August 30 at 12:36AM AKDT until August 30 at 1:15PM AKDT by NWS Anchorage AK
AREAS AFFECTED: Cordova
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Eyak Lake and river near Cordova. * WHEN...Until 115 PM AKDT Saturday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Some low-water crossings may become impassable. * ADDITIONAL DETAILS... - At 1235 AM AKDT, Heavy rain over the past 24 hours has resulted in rises in water levels across the advisory area. Minor flooding is ongoing or expected to begin shortly, especially near Eyak Lake and Eyak River. - 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. Be aware of your surroundings and do not drive on flooded roads.
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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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