Weather Alert in Arizona
Dust Advisory issued September 1 at 5:22PM MST until September 1 at 6:00PM MST by NWS Phoenix AZ
AREAS AFFECTED: Maricopa, AZ
DESCRIPTION: The National Weather Service in Phoenix has issued a * Dust Advisory for... Maricopa County in south central Arizona... * Until 600 PM MST. * At 521 PM MST, patche of blowing dust were along a line extending from near Scottsdale to Scottsdale Airport to Salt River Indian Community, moving west at 30 mph. 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... AZ Interstate 10 between mile markers 142 and 153. AZ Interstate 17 between mile markers 195 and 222. AZ Route 51 between mile markers 1 and 15. Locations impacted include... Phoenix, Mesa, Glendale, Scottsdale, Tempe, Paradise Valley, Mesa Riverview Mall, Tempe Marketplace, Papago Park, Piestewa Peak Park, Deer Valley Airport, Salt River Indian Community, North Mountain Park, Arizona State Fairgrounds, and Downtown Phoenix.
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.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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