Weather Alert in Arizona
Dust Storm Warning issued August 25 at 5:29PM MST until August 25 at 6:30PM MST by NWS Phoenix AZ
AREAS AFFECTED: Maricopa, AZ
DESCRIPTION: The National Weather Service in Phoenix has issued a * Dust Storm Warning for... Maricopa County in south central Arizona... * Until 630 PM MST. * At 529 PM MST, a wall of dust was along a line extending from near Saguaro Lake to near Granite Reef Dam to Papago Park, moving northwest at 30 mph. HAZARD...Near zero visibility with strong wind in excess of 50 mph. SOURCE...Doppler radar. IMPACT...Dangerous life-threatening travel. * This includes the following highways... AZ Interstate 17 between mile markers 218 and 228. AZ Route 51 between mile markers 11 and 15. AZ Route 87 between mile markers 187 and 204. Locations impacted include... Phoenix, Scottsdale, Fountain Hills, Paradise Valley, New River, Sugarloaf Mountain, Cave Creek, Carefree, Deer Valley Airport, McDowell Mountain Park, Saguaro Lake, Goldfield Ranch, Desert Mountain, Scottsdale Airport, and Desert Ridge Marketplace.
INSTRUCTION: Dust storms lead to dangerous driving conditions with visibility reduced to near zero. If driving, avoid dust storms if possible. If caught in one, pull off the road, turn off your lights and keep your foot off the brake.
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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