Weather Alert in Washington
Special Weather Statement issued March 19 at 12:11PM 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 of 2 to 7 inches over the past 3 days has increased soil moisture to high levels across western Washington. Heavy rainfall of 0.75 up to 4 inches is expected over the next 30 hours. This amount of rain will 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 at least one landslide has been reported in King County. 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 for several days 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 Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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
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