Weather Alert in Arizona
Dust Advisory issued August 31 at 5:30PM MST until August 31 at 7:00PM MST by NWS Tucson AZ
AREAS AFFECTED: Pima, AZ; Santa Cruz, AZ
DESCRIPTION: The National Weather Service in Tucson has issued a * Dust Advisory for... Southeastern Pima County in southeastern Arizona... Santa Cruz County in southeastern Arizona... * Until 700 PM MST. * At 530 PM MST, a wall of dust was located along a line from near Saguaro National Park East to 8 miles southeast of Parker Canyon Lake, moving southwest at 20 mph. HAZARD...Less than three miles visibility. SOURCE...Detected by National Weather Service meteorologists. IMPACT...Hazardous travel. * Locations impacted include... Tucson, Sahuarita, Green Valley, Nogales, Tubac, Davis-Monthan Air Force Base, Drexel Heights, Rio Rico, Corona De Tucson, Pascua Pueblo Yaqui Reservation, East Sahuarita, San Xavier Community, Patagonia, Patagonia Lake State Park, Nogales International Airport, Summit, Tucson International Airport, Valencia West, Tucson Estates and Tucson Mountain Park. This includes the following highways... Interstate 19 between mile markers 1 and 62. Route 86 between mile markers 164 and 167...and between mile markers 169 and 171. Interstate 10 between mile markers 262 and 278. Route 82 between mile markers 1 and 28.
INSTRUCTION: Motorists should not drive into an area of blowing dust. PULL ASIDE STAY ALIVE!
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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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