Weather Alert in Washington
Flash Flood Watch issued July 31 at 7:41PM PDT until August 1 at 8:00PM PDT by NWS Spokane WA
AREAS AFFECTED: Chelan, WA; Ferry, WA; Okanogan, WA; Stevens, WA
DESCRIPTION: * WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the Pioneer and 25 mile burn scars in Chelan County, the Cedar Creek, Cub Creek, Muckamuck, Walker Creek, Eagle Bluff, Stud Horse, and Swawilla burn scars in Okanogan and Ferry County, and the Hope and Lake Spokane burn scars in Stevens County. * WHERE...Portions of North Central and Northeast Washington, including the following counties, in North Central Washington, Chelan and Okanogan. In Northeast Washington, Ferry and Stevens. * WHEN...From Friday morning through Friday evening. * IMPACTS...Heavy rainfall over the burn scar is expected up to and during the period of the watch. Rainfall rates with the thunderstorms will reach up to one inch per hour. Residents near burn scars should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding of low-lying areas, urbanized street flooding, and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over burn scars, which may lead to flash flooding and debris flows. - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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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
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.
Next Topic: Stratocumulus Clouds
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