Weather Alert in Washington
Winter Weather Advisory issued February 16 at 8:50AM PST until February 17 at 12:00PM PST by NWS Seattle WA
AREAS AFFECTED: Willapa and Black Hills; Southern Hood Canal; Lake Crescent Area Including US 101; Foothills of the Western and Southern Olympic Peninsula; Lower Chehalis River Valley
DESCRIPTION: * WHAT...Snow showers expected. Total snow accumulations of 1 to 3 inches. * WHERE...Foothills of the Western and Southern Olympic Peninsula, Lake Crescent Area Including US 101, Lower Chehalis River Valley, Southern Hood Canal, and Willapa and Black Hills. * WHEN...Until noon PST Tuesday. The snow potential will gradually shift southward from the northern Olympic Peninsula today south toward Grays Harbor and the Hood Canal tonight. * IMPACTS...Roads, and especially bridges and overpasses, may become slick and hazardous. Plan on wintry road conditions. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. * ADDITIONAL DETAILS...As of 845 am, snow was being observed along U.S. Highway 101 west of Lake Crescent. Precipitation will come in the form of hit and miss showers while temperatures generally hover in the low to mid 30s. However, quick accumulations will be possible in heavy showers creating rapidly deteriorating road conditions.
INSTRUCTION: Slow down and use caution while traveling. Prepare for possible power outages. Be prepared for wintry road conditions. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be icy and slippery, increasing your risk of a fall and injury.
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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