Weather Alert in Arizona
Blowing Dust Advisory issued August 25 at 2:00AM MST until August 25 at 6:00PM MST by NWS Phoenix AZ
AREAS AFFECTED: Gila Bend; Southeast Valley/Queen Creek; Northwest Pinal County; West Pinal County; Sonoran Desert Natl Monument
DESCRIPTION: * WHAT...Visibility between one-quarter and one mile in blowing dust possible. * WHERE...Sonoran Desert National Monument, Gila Bend, Southeast Valley/Queen Creek, Northwest Pinal County, and West Pinal County. * WHEN...From 2 PM this afternoon to 6 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 is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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