Weather Alert in California
Special Weather Statement issued February 16 at 11:39AM PST by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: Los Angeles County Beaches; Los Angeles County Inland Coast including Downtown Los Angeles; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
DESCRIPTION: At 1137 AM PST, Doppler radar was tracking strong thunderstorms along a line extending from near Acton to 10 miles north of Avalon. Movement was east at 30 mph. HAZARD...Wind gusts up to 55 mph. Brief weak tornado possible. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Eaton Burn Scar... Long Beach... Pomona... San Dimas... Glendora... Alhambra... West Covina... Pasadena... Mount Wilson... Whittier... Buena Park... Chino Hills... La Habra... Altadena... Montclair... La Verne... Mount Baldy... Artesia... Baldwin Park... Commerce... and Santa Fe Springs.
INSTRUCTION: If outdoors, consider seeking shelter inside a building. Torrential rainfall is also occurring with these storms and may lead to localized flooding. Do not drive your vehicle through flooded roadways.
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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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