Weather Alert in Arizona
Dust Advisory issued August 31 at 6:25PM MST until August 31 at 7:30PM MST by NWS Tucson AZ
AREAS AFFECTED: Pima, AZ
DESCRIPTION: The National Weather Service in Tucson has issued a * Dust Advisory for... Northeastern Pima County in southeastern Arizona... * Until 730 PM MST. * At 625 PM MST, an area of blowing dust was located near Catalina Foothills, moving west at 20 mph. HAZARD...Less than three miles visibility. SOURCE...Radar indicated. IMPACT...Hazardous travel. * Locations impacted include... Tucson, Catalina, Oro Valley, Marana, Davis-Monthan Air Force Base, Casas Adobes, Flowing Wells, Tanque Verde, South Tucson, Avra Valley, Tortolita, Saguaro National Park West, Tucson Mountain Park, Tucson Estates, Catalina State Park, Catalina Foothills, Sabino Canyon Recreation Area, Picture Rocks and Dove Mountain. This includes the following highways... Interstate 19 near mile marker 63. Route 77 between mile markers 70 and 87. Interstate 10 between mile markers 233 and 261.
INSTRUCTION: Motorists should not drive into an area of blowing dust. PULL ASIDE STAY ALIVE!
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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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