Weather Alert in California
Winter Storm Watch issued February 14 at 11:47AM PST until February 19 at 9:00AM PST by NWS San Diego CA
AREAS AFFECTED: San Bernardino County Mountains
DESCRIPTION: * WHAT...Two rounds of heavy snow possible. For first round Monday, 4-9 inches expected between 6000-7000 ft, 9-14 inches expected 7000-8000 ft, and up to 20 inches above 8000 ft. Winds could gust 60 to 70 mph, with the strongest winds on the desert slopes of the mountains. There may be breaks in snow showers or lighter snow during the day Tuesday, with a second round of heavy snow and gusty winds Wednesday into Thursday morning. * WHERE...San Bernardino County Mountains. * WHEN...From Monday morning through Thursday morning. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Visibilities may drop below 1/4 mile due to falling and blowing snow. Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning and evening commutes. Strong winds could cause tree damage. * ADDITIONAL DETAILS...For the first round Monday, snow levels will start around 6500 ft and fall to near 5000 ft. Lower snow levels possible for the next round on Wednesday.
INSTRUCTION: Monitor the latest forecasts for updates on this situation.
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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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