Weather Alert in Arizona
Blowing Dust Advisory issued April 27 at 12:37AM MST until April 27 at 7:00PM MST by NWS Tucson AZ
AREAS AFFECTED: Eastern Cochise County Below 5000 Feet including Douglas/Willcox; Upper Gila River and Aravaipa Valleys including Clifton/Safford
DESCRIPTION: * WHAT...Southwest winds between 15 to 25 mph with localized areas up to 30 mph and gusts to 40-45 mph will create areas of blowing dust reducing visibility to between one and three miles. Localized dust prone areas including near the Wilcox Playa and the Arizona and New Mexico state line along Interstate 10 may see reductions in visibility to between one-quarter and one-half mile in blowing dust. * WHERE...Eastern Cochise County below 5000 feet and Upper Gila River Valley. * WHEN...From 10 AM this morning to 7 PM MST this evening. * IMPACTS...Hazardous driving conditions due to reduced visibility.
INSTRUCTION: Persons with respiratory problems should make preparations to stay indoors until the storm passes. Be ready for a sudden drop in visibility to near zero. If you encounter blowing dust or blowing sand on the roadway or see it approaching, pull off the road as far as possible and put your vehicle in park. Turn the lights all the way off and keep foot off the brake pedal. Remember, 'Pull Aside, Stay Alive'.
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
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
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