Weather Alert in Alaska
Flood Warning issued August 29 at 11:04PM AKDT until August 30 at 11:00PM AKDT by NWS Anchorage AK
AREAS AFFECTED: Central Susitna Valley; Northern Susitna Valley
DESCRIPTION: * WHAT...Flooding caused by previous excessive rainfall is expected. * WHERE...Talkeetna River. * WHEN...Until 1100 PM AKDT Saturday. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS... - At 1052 PM AKDT, river gauge reports indicate rises in water levels from previous days heavy rain across the warned area. Flooding is ongoing or expected to begin shortly, especially near and along the Talkeetna River. - For Talkeetna River Upstream of Talkeetna: At 9:45pm the stage was 12.1 feet. Flood Stage is 12.5 feet. Forecast: A crest around 12.7 feet is expected around 4:00am Saturday. - For Talkeetna River at the Talkeetna Railroad Bridge: At 10:00pm the stage was 14.82 feet. Major Flood Stage is 15.0 feet. The river is expected to crest early Saturday just above Major Flood Stage then begin to fall. - For Susitna River near Sunshine: At 10:00pm the stage was 25.9 feet. Flood Stage is 24.5 feet. Forecast: A crest around 25.4 feet is expected around 10:00am Saturday. - 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 are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
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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.
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Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
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