Weather Alert in California

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

AREAS AFFECTED: South Central Siskiyou County; North Central and Southeast 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 6 to 12 inches possible. Winds could gust as high as 40 mph over high and exposed terrain. For the second Winter Storm Watch, heavy snow possible late Sunday night through late Tuesday night. Total snow accumulations between 8 and 16 inches with up to 2 ft possible above 5000 ft. Winds could gust 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...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 through Tuesday night, possibly as low as 2000 ft by Tuesday morning.

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 Nimbostratus Clouds?

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Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

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Weather Topic: What is Rain?

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Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

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