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 Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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