Weather Alert in Utah
Winter Storm Warning issued February 17 at 2:29PM MST until February 19 at 5:00AM MST by NWS Salt Lake City UT
AREAS AFFECTED: Wasatch Mountains I-80 North; Wasatch Mountains South of I-80; Western Uinta Mountains
DESCRIPTION: * WHAT...Heavy snow. Total snow accumulations between 1 and 2 feet with locally higher accumulations up to 30 inches across the upper Cottonwoods. * WHERE...The Wasatch Mountains, and Western Uinta Mountains. * WHEN...Until 5 AM MST Thursday. * IMPACTS...Winter driving conditions can be expected on all mountain routes. Traction restrictions are likely. * ADDITIONAL DETAILS...A period of heavy snow is expected between roughly 5 AM to 11 AM, with snowfall rates generally 1 to 2 inches per hour likely, except exceeding 2 inches per hour in the Upper Cottonwoods. Northwesterly flow prevailing behind a frontal passage will result in lingering showers through the end of the day Wednesday.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For winter road conditions from the Utah Department of Transportation, visit http://www.udottraffic.utah.gov. For graphical depictions of the snowfall forecast, including Official NWS Forecast, High End Amount, and Low End Amount, visit weather.gov/slc/winter.
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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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