Weather Alert in California

Recent Locations: Pasadena, CA   Waco, TX  

Winter Storm Watch issued February 13 at 10:17PM PST until February 15 at 9:00PM PST by NWS Medford OR

AREAS AFFECTED: Western Siskiyou County

DESCRIPTION: * WHAT...For the first Winter Storm Watch Above 5000 Feet, heavy snow possible late Sunday morning through Sunday evening. Total snow accumulations up to 6 inches possible. For the second Winter Storm Watch Above 3000 ft, heavy snow possible late Sunday night through late Tuesday night. Additional snow accumulations between 6 and 12 inches possible. Winds could gust as high as 35 mph over high and exposed terrain. * WHERE...Elevations above 3000 ft in western Siskiyou County. This includes Etna Summit on Sawyers Bar Rd and Highway 3 south of Callahan. * WHEN...For the first Winter Storm Watch, from Sunday morning through Sunday evening. For the second Winter Storm Watch, from Sunday evening through late Tuesday night. * 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 on Sunday into Sunday evening are expected to lower to 4500 ft Sunday night then down to 4000 ft Monday. Snow levels lower further Monday night into Tuesday, possibly as low as 2000 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.

INSTRUCTION: Monitor the latest forecasts for updates on this situation. Persons should consider delaying all travel. If travel is absolutely necessary, drive with extreme caution. Consider taking a winter storm kit along with you, including such items as tire chains, booster cables, flashlight, shovel, blankets and extra clothing. Also take water, a first aid kit, and anything else that would help you survive in case you become stranded.

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Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

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

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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