Weather Alert in California
Winter Storm Warning
Winter Storm Warning issued February 17 at 9:17PM PST until February 19 at 10:00PM PST by NWS San Diego CA
AREAS AFFECTED: San Bernardino County Mountains
DESCRIPTION: * WHAT...Heavy snow expected. Additional snowfall through Wednesday of 3 to 8 inches from 5000 to 6000 feet, 8 to 16 inches from 6000 to 7000 feet, locally exceeding 20 inches above 7500 feet. Snow levels around 5000-5500 feet will fall to 3500 to 4500 feet Wednesday morning. Southwest winds of 25 to 35 mph will gust to 65 mph with isolated gusts to 75 mph on the desert mountain slopes are expected. An additional 3 to 8 inches of snow Thursday. * WHERE...San Bernardino County Mountains. * WHEN...Until 10 PM PST Thursday. * IMPACTS...Travel could be very difficult to impossible due to snow covered roads and near zero visibility at times. The hazardous conditions could impact the Wednesday morning and evening commutes. Very strong winds could cause extensive tree damage. * ADDITIONAL DETAILS...Potentially damaging winds expected tonight into Wednesday, strongest on the desert slopes. For early Wednesday morning and again Thursday, there is a chance of light accumulating snow on I-15 at the summit of the Cajon Pass.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
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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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