Weather Alert in California
Winter Storm Warning issued February 15 at 4:39AM PST until February 18 at 4:00AM PST by NWS Medford OR
AREAS AFFECTED: South Central Siskiyou County; North Central and Southeast Siskiyou County
DESCRIPTION: * WHAT...Heavy snow expected above 5000 ft through Monday morning with accumulations of 8 to 12 inches expected. After a brief lull in precipitation Monday afternoon, snow levels drop to around 1500 to 2000 ft Monday night into Tuesday, and remain low through Thursday. Additional snow accumulations 6 to 12 inches are expected with 1 to 2 ft expected above 5000 ft. Winds gusting as high as 40 mph over high and exposed terrain. * WHERE...Southern and eastern Siskiyou County. This includes Highways 97 and 89, Interstate 5 south of Weed, Black Butte Summit, Snowman Summit, Dead Horse Summit, Grass Lake Summit and Mt Shasta Ski Park Road. This also includes the communities of Mt Shasta City, Dunsmuir, McCloud and Tennant. * WHEN...From 10 AM this morning to 4 AM PST Wednesday. * IMPACTS...Travel may be very difficult to impossible. The hazardous conditions could impact the Monday morning and evening commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snow levels of 5000 feet today are expected to lower to 4500 ft tonight then down to 4000 ft Monday. There could be a period early Monday morning when precipitation intensity brings snow levels down to Mt Shasta City, resulting in accumulating snow along the I-5 corridor. Snow levels lower further Monday night through Tuesday night down to 1500 to 2000 ft by Tuesday morning. Visit weather.gov/mfr/winter for additional snow probabilities
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Call 511 or visit quickmap.dot.ca.gov for road information.
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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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