Weather Alert in Arizona
Blowing Dust Advisory issued June 30 at 8:28AM MST until June 30 at 10:00PM MST by NWS Tucson AZ
AREAS AFFECTED: Upper Gila River and Aravaipa Valleys including Clifton/Safford
DESCRIPTION: * WHAT...Dangerously hot conditions with temperatures 108 to 112 in the Gila River Valley. Isolated thunderstorms with strong thunderstorm outflow wind gusts to 45-50 mph will result in blowing dust lowering visibility between one-quarter and one mile at times. The threat for blowing dust will persist into the evening as stronger sustained east-to-southeast winds 20-30 mph move into the area from the east. * WHERE...Upper Gila River Valley. * WHEN...For the Extreme Heat Warning, until 8 PM MST this evening. For the Blowing Dust Advisory, from 1 PM this afternoon to 10 PM MST this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Blowing dust can restrict visibilities below a mile posing a significant hazard to motorists. In addition, strong and gusty winds will likely suspend dust into the air that people and animals breathe. Individuals with heart disease and respiratory sensitivities may want to reduce their level of exertion to limit the dust they breathe into their lungs, especially if they are near dust prone locations. Those most at risk may feel better if they avoid outside exercise today, keeping windows and doors closed to help reduce exposure.
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'. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible and drink plenty of water.
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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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