Weather Alert in California
Winter Storm Warning issued March 13 at 12:08PM PDT until March 14 at 5:00PM PDT by NWS Medford OR
AREAS AFFECTED: South Central Siskiyou County; North Central and Southeast Siskiyou County
DESCRIPTION: * WHAT...Heavy snow possible. Total snow accumulations of 6 to 14 inches, except up to 20 inches possible above 4500 feet. Winds could gust as high as 50 mph. * WHERE...Interstate 5 south of Weed, Highway 97 northeast of Weed, Highway 89 at Snowman Summit and Dead Horse Summit. This includes the cities of Mount Shasta, Dunsmuir, McCloud, Bray, and Tennant. * WHEN...From 2 AM to 5 PM PDT Friday. * IMPACTS...Travel could be very difficult with reduced visibility in snow. The hazardous conditions could impact the Friday morning and evening commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snow levels are expected down to lower valley floors of around 2000 feet Friday morning. Snowfall rates will be highest from 5 am to 11 am PDT and could be an inch per hour at times.
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
