Weather Alert in California

Recent Locations: Walnut, CA  
Current Alerts for Walnut, CA: High Surf Advisory Wind Advisory

Winter Storm Warning issued February 18 at 2:32PM PST until February 19 at 10:00AM PST by NWS Medford OR

AREAS AFFECTED: South Central Siskiyou County; North Central and Southeast Siskiyou County

DESCRIPTION: ...ANOTHER EPISODE OF LOW ELEVATION SNOW LATE TONIGHT INTO THURSDAY... .Scattered to numerous light snow showers will persist through this evening with snow levels around 1500 to 2000 feet and accumulation of up to 2 inches. The next cold front will follow with widespread accumulations of snow late tonight into Thursday morning and snow levels around 1000 to 1500 feet. Light snow showers will then taper off into Thursday afternoon while snow levels rise to 2000 feet, except for snow showers lingering into Thursday evening for eastern Klamath, Lake, and Modoc Counties. * WHAT...Heavy snow. Additional snow accumulations 4 to 12 inches, except up to 20 inches for the high terrain. A majority of the snow is expected from Midnight to 8 AM PST on Thursday morning, with light snow showers then tapering off through the morning. * 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...Until 10 AM PST Thursday. * IMPACTS...Travel may be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. * ADDITIONAL DETAILS... Visit weather.gov/mfr/winter for additional 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 is Graupel?

Home - Education - Precipitation - Graupel

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

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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