Weather Alert in California
Winter Storm Warning issued February 17 at 1:14PM PST until February 19 at 10:00PM PST by NWS Sacramento CA
AREAS AFFECTED: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Northern Sacramento Valley; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
DESCRIPTION: * WHAT...Heavy snow with additional snow accumulations up to 1 foot between 1000 and 3000 feet, 2 to 3 feet above 3000 feet, and up to 4 feet at peaks. Light snowfall accumulations up to an inch below 1000 feet in Shasta County. Winds gusting as high 45 to 55 mph. * WHERE...West Slope Northern Sierra Nevada and adjacent foothills, Western Plumas County/Lassen Park, Shasta County, including the city of Redding, and the Coastal Range. * WHEN...Until 10 PM PST Thursday. * IMPACTS...Dangerous to near impossible travel conditions with chain controls and road closures. Low visibility due to a combination of gusty wind and heavy snow. * ADDITIONAL DETAILS...Snow levels remain around 1500 to 2500 feet through Thursday. Potential to see snow levels as low as 1000 feet along the Sierra and below 1000 feet along the southern Cascades and Shasta County in the morning hours. A brief lull in activity is expected during the day on Wednesday.
INSTRUCTION: Check the latest road conditions from Caltrans online at quickmap.dot.ca.gov or dial 5 1 1.
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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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