Weather Alert in Washington
Cold Weather Advisory issued February 18 at 3:23AM PST until February 18 at 10:00AM PST by NWS Seattle WA
AREAS AFFECTED: Lowlands of Western Whatcom County
DESCRIPTION: * WHAT...Very cold wind chills as low as 17 to 20 degrees expected. * WHERE...Lowlands of Western Whatcom County. * WHEN...Until 10 AM PST this morning. * IMPACTS...Very cold temperatures can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS...While temperatures will warm during the day Wednesday, additional cold temperatures are expected Wednesday night into Thursday.
INSTRUCTION: Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside. For sheltering information and other human services in your area, dial 2 1 1 during business hours or visit wa211.org anytime.
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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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