Weather Alert in Washington
Winter Weather Advisory issued February 22 at 2:44PM PST until February 23 at 1:00PM PST by NWS Pendleton OR
AREAS AFFECTED: Upper Slopes of the Eastern Washington Cascades Crest
DESCRIPTION: * WHAT...Snow. Additional snow accumulations up to 14 to 20 inches above 5000 ft. Accumulations of 4 to 8 inches around the Pass Levels. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...Until 1 PM PST Monday. * IMPACTS...Relatively warmer road surface temperatures will limit the impacts during the daytime hours as snow can melt of the most heavily traveled highways. Periods of moderate to heavy snowfall rates will create slick roads creating very difficult driving conditions at night.
INSTRUCTION: Slow down and use caution while traveling. The latest road conditions can be obtained by visiting the website wsdot.wa.gov/travel.
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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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