Weather Alert in Washington
Flood Watch issued August 27 at 1:49PM PDT until August 28 at 9:00PM PDT by NWS Spokane WA
AREAS AFFECTED: Chelan, WA; Okanogan, WA
DESCRIPTION: Thunderstorms with heavy rain are expected to develop late Thursday morning through Thursday evening in the Cascades. Heavy rainfall in steep terrain and burn scars may lead to flash flooding or debris flows on Thursday. * WHAT...Flash flooding and debris flows caused by excessive rainfall from thunderstorms is possible. * WHERE...A portion of North Central Washington, including the following counties, Chelan and Okanogan. This will include, but not limited to burn scar locations: Pioneer and 25 Mile burn scars in Chelan County, and Cedar Creek, Cub Creek, Muckamuck, Walker Creek, and Eagle Bluff burn scars in Okanogan County. * WHEN...From Thursday morning through Thursday evening. * IMPACTS...Heavy rainfall may result in flash flooding or debris flows in steep terrain, particularly near burn scar locations. Rain rates of up to an inch per hour will be possible with thunderstorms. * ADDITIONAL DETAILS... - Those within canyons or near burn scars should monitor for updated information from local authorities. - 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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