Weather Alert in Washington
Special Weather Statement issued March 20 at 12:16PM PDT by NWS Seattle WA
AREAS AFFECTED: San Juan County; Cascades of Whatcom and Skagit Counties; Cascades of Snohomish and Northern King Counties; Cascades of Southern King County; Cascades of Pierce and Lewis Counties; Foothills and Valleys of the North Cascades; Foothills and Valleys of Snohomish and Northern King Counties; Foothills and Valleys of Central King County; Foothills and Valleys of Pierce and Southern King Counties; Lowlands of Western Whatcom County; Lowlands of Western Skagit and Northwestern Snohomish Counties; Downtown Everett / Marysville Area; Shoreline / Lynnwood / South Everett Area; Eastside; City of Seattle; Lowlands of Pierce and Southern King Counties; Olympia and Southern Puget Sound; Middle Chehalis River Valley; Willapa and Black Hills; Southern Hood Canal; Western Strait of Juan de Fuca; Lake Crescent Area Including US 101; Olympics; Foothills of the Western and Southern Olympic Peninsula; Northern Washington Coast; Grays Harbor County Coast; Lower Chehalis River Valley
DESCRIPTION: Rainfall amounts of 2 to 9 inches over the past 3 days has increased soil moisture to high levels across western Washington. This amount of rain that has been observed will continue to put extra pressure on soil instability, leading to an increased threat of landslides and debris flows, especially from recent burned areas. Over the last couple days multiple slides have been reported across locations of western Washington. More landslides are possible. Areas most susceptible to landslides debris flows under these conditions are steep coastal bluffs, other steep hillsides or road cuts, and recent burned areas. A diminishing threat of landslides and debris flows will continue over the weekend after the rain ends. For more information about current conditions, visit www.weather.gov/seattle, select Hydrology, and then scroll down for the links to the landslide information pages. For more information on landslides, visit the website for the Washington State Department of Natural Resources landslide geologic hazards at: http://bit.ly/2mtA3wn
INSTRUCTION: N/A
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Weather Topic: What are Cumulonimbus Clouds?
Home - Education - Cloud Types - Cumulonimbus Clouds
Next Topic: Cumulus Clouds
The final form taken by a growing cumulus cloud is the
cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although
most commonly they stop growing at an altitude of 6 km.
Even small cumulonimbus clouds appear very large in comparison to other cloud types.
They can signal the approach of stormy weather, such as thunderstorms or blizzards.
Next Topic: Cumulus Clouds
Weather Topic: What is Drizzle?
Home - Education - Precipitation - Drizzle
Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are
smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not
impact human habitation in a negative way. The exception to this is freezing drizzle,
a condition where drizzle freezes immediately upon reaching earth's surface.
Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
Next Topic: Evaporation
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