Weather Alert in Alaska
Flood Advisory issued September 3 at 4:59AM AKDT until September 4 at 9:15AM AKDT by NWS Anchorage AK
AREAS AFFECTED: Western Susitna Valley; Central Susitna Valley; Northern Susitna Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Northern Susitna Valley in the Petersville area * WHEN...Until 915 AM AKDT Thursday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams. Some low-water crossings may become impassable. River or stream flows are elevated. * ADDITIONAL DETAILS... - At 455 AM AKDT, another round of rain is moving up the Cook Inlet and will move into the Susitna Valley later today. Heavy rain is not anticipated, but even minor amounts could exacerbate ongoing flooding issues along the headwaters of Peters Creek and Cache Creek. - Area creeks and streams are already running higher than normal after the rainfall from last week. While waters have been receding, additional rainfall may result in rises again this week. - Streams that may be affected include Peters Creek, Cache Creek, Moose Creek, Kroto Creek, and other nearby streams and their tributaries. Larger rivers such as that Yentna and Susitna are NOT expected to rise into flood stage again. - 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. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks.
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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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