Weather Alert in Idaho
Winter Weather Advisory issued February 23 at 5:02PM MST until February 25 at 5:00PM MST by NWS Pocatello ID
AREAS AFFECTED: Sawtooth/Stanley Basin; Sun Valley Region; Big Lost Highlands/Copper Basin
DESCRIPTION: * WHAT...Moderate to heavy snow expected above 7000 feet. Total snow accumulations between 7 and 17 inches. Amounts exceeding 2 feet are possible across the Sawtooths. Winds gusts up to 35 mph are possible, peaking in excess of 45 mph Tuesday night and Wednesday morning. * WHERE...Big Lost Highlands/Copper Basin, Sawtooth/Stanley Basin, and Sun Valley Region. * WHEN...Until 5 PM MST Wednesday. * IMPACTS...Travel could be very difficult. Some blowing and drifting snow is expected, especially in exposed areas and higher ridgetops.
INSTRUCTION: Slow down and use caution while traveling. Call 5 1 1 or visit 511.idaho.gov for the latest road conditions.
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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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