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: Western 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...In western Siskiyou County, elevations above 5000 ft through Monday morning, lowering to 3000 ft Monday evening. This includes Etna Summit on Sawyers Bar Rd and Highway 3 south of Callahan. * 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. * ADDITIONAL DETAILS...Snow levels of 5000 feet today are expected to lower to 4500 ft tonight then down to 4000 ft Monday. Snow levels lower further Monday night into Tuesday, possibly as low as 1500 ft by Tuesday morning. This could result in light snow accumulations of 1 to 3 inches in the Scott and Klamath River Valleys during Tuesday through Tuesday night. Visit weather.gov/mfr/winter for 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 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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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