Weather Alert in Arizona
Dust Advisory issued September 3 at 5:25PM MST until September 3 at 7:00PM MST by NWS Tucson AZ
AREAS AFFECTED: Pima, AZ; Pinal, AZ
DESCRIPTION: The National Weather Service in Tucson has issued a * Dust Advisory for... North Central Pima County in southeastern Arizona... Southeastern Pinal County in southeastern Arizona... * Until 700 PM MST. * At 525 PM MST, an area of blowing dust was located 15 miles northeast of Pinal Airpark, moving northwest at 15 mph. HAZARD...Less than one mile visibility. SOURCE...Detected by National Weather Service meteorologists. IMPACT...Hazardous travel. * Locations impacted include... Marana, Eloy, Avra Valley, Saddlebrooke Ranch, Picacho, Chui-Chu, Picacho Peak State Park, Pinal Airpark, Picture Rocks, Red Rock, Cactus Forest, Shopishk, Dove Mountain and East Chui-Chu. This includes the following highways... Route 79 between mile markers 93 and 128. Route 87 between mile markers 116 and 124. Interstate 10 between mile markers 205 and 239.
INSTRUCTION: Motorists should not drive into an area of blowing dust. PULL ASIDE STAY ALIVE! 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 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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