Weather Alert in California
Dust Advisory issued August 25 at 3:10PM PDT until August 25 at 4:15PM PDT by NWS Phoenix AZ
AREAS AFFECTED: Imperial, CA
DESCRIPTION: The National Weather Service in Phoenix has issued a * Dust Advisory for... Southwestern Imperial County in southeastern California... * Until 415 PM PDT. * At 309 PM PDT, a wall of dust was along a line extending from near Calexico to near El Centro Naval Airfield to Plaster City. HAZARD...Less than one mile visibility with strong wind in excess of 50 mph. SOURCE...Doppler radar. IMPACT...Hazardous travel. * This includes the following highways... CA Interstate 8 near mile marker 1, and between mile markers 3 and 60. CA Route 111 between mile markers 1 and 19. CA Route 86 between mile markers 1 and 17. Locations impacted include... El Centro, Calexico, Imperial, Plaster City, Ocotillo, Holtville, Mt. Signal, El Centro Naval Airfield, Coyote Wells, Seeley, Bonds Corner, Heber, and Dixieland.
INSTRUCTION: Blowing dust brings reduced visibility, leading to dangerous driving conditions. If driving, avoid blowing dust if possible. If caught in dense blowing dust, pull off the road, turn off your lights and keep your foot off the brake. Motorists should not drive into an area of blowing dust. PULL ASIDE STAY ALIVE! Strong to severe thunderstorms are also possible behind this wall of dust. Keep updated with this quickly evolving 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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