Weather Alert in Washington
Flash Flood Watch issued July 31 at 10:07AM PDT until August 1 at 5:00AM PDT by NWS Seattle WA
AREAS AFFECTED: Cascades of Whatcom and Skagit Counties; Foothills and Valleys of the North Cascades
DESCRIPTION: Thunderstorms will develop over the Cascades this afternoon and tonight. Storms will be slow-moving and produce high rain rates, allowing for potential flash flooding over area burn scars. * WHAT...Flash flooding and debris flows caused by excessive rainfall continue to be possible over the Sourdough, Easy, Chilliwack, and Suiattle-Boulder-Toketie burn scar. * WHERE...A portion of northwest Washington, including the following areas, Cascades of Whatcom and Skagit Counties and Foothills and Valleys of the North Cascades. * WHEN...Through late tonight. * IMPACTS...Heavy rainfall over the Sourdough, Easy, Chilliwack, and Suiattle-Boulder-Toketie burn scars is expected up to and during the period of the watch. Residents and travelers near the Sourdough, Easy, Chilliwack, and Suiattle-Boulder-Toketie burn scar 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 the burn scar, 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 is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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