Weather Alert in California
Winter Storm Warning issued February 18 at 2:32PM PST until February 19 at 10:00AM PST by NWS Medford OR
AREAS AFFECTED: Western 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 at elevations above 3000 feet and 1 to 5 inches at elevations below 3000 feet. Snow levels near 2000 feet will fall to valley floors overnight. A majority of the snow is expected between Midnight and 7 AM PST Thursday morning, with light snow showers then tapering off through the morning. * WHERE...In western Siskiyou County. This includes all of Highway 96 and 3, and Etna Summit on Sawyers Bar Rd. This also includes the Klamath River and Scott Valleys, the communities of Happy Camp, Somes Bar, Etna, Greenview, and Callahan. * 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 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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