Weather Alert in Arizona
Blowing Dust Advisory issued August 21 at 9:38AM MST until August 21 at 9:00PM MST by NWS Tucson AZ
AREAS AFFECTED: Tohono O'odham Nation including Sells; Tucson Metro Area including Tucson/Green Valley/Marana/Vail; South Central Pinal County including Eloy/Picacho Peak State Park; Southeast Pinal County including Kearny/Mammoth/Oracle
DESCRIPTION: * WHAT...For the Extreme Heat Warning, dangerously hot conditions with temperatures ranging from 105 to 110 across much of Pima and southeastern Pinal counties leading to Major Heat Risk. In other areas of southeastern Arizona, high temperatures will range from 100 to 105 degrees. For the Blowing Dust Advisory, visibility between one-quarter and one mile in blowing dust expected. * WHERE...South Central Pinal County, Southeast Pinal County, Tohono O'odham Nation, and Tucson Metro Area. * WHEN...The Extreme Heat Warning is in effect now until 8 PM MST Friday. The Blowing Dust Advisory will be in effect from 4 PM this afternoon to 9 PM MST this evening. * IMPACTS...Hazardous driving conditions due to reduced visibility. Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Major Heat Risk is when heat will affect anyone without cooling or hydration as well as health systems and industries.
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 is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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