Weather Alert in Arizona
Flood Watch issued September 3 at 1:30PM MST until September 5 at 12:00AM MST by NWS Phoenix AZ
AREAS AFFECTED: Aguila Valley; Northwest Valley; Tonopah Desert; Gila Bend; Buckeye/Avondale; Cave Creek/New River; Deer Valley; Central Phoenix; North Phoenix/Glendale; New River Mesa; Scottsdale/Paradise Valley; Rio Verde/Salt River; East Valley; Fountain Hills/East Mesa; South Mountain/Ahwatukee; Southeast Valley/Queen Creek; Superior; Northwest Pinal County; West Pinal County; Apache Junction/Gold Canyon; Tonto Basin; Mazatzal Mountains; Pinal/Superstition Mountains; Sonoran Desert Natl Monument; San Carlos; Dripping Springs; Globe/Miami; Southeast Gila County
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of south central Arizona, including the following areas, Aguila Valley, Apache Junction/Gold Canyon, Buckeye/Avondale, Cave Creek/New River, Central Phoenix, Deer Valley, Dripping Springs, East Valley, Fountain Hills/East Mesa, Gila Bend, Globe/Miami, Mazatzal Mountains, New River Mesa, North Phoenix/Glendale, Northwest Pinal County, Northwest Valley, Pinal/Superstition Mountains, Rio Verde/Salt River, San Carlos, Scottsdale/Paradise Valley, Sonoran Desert Natl Monument, South Mountain/Ahwatukee, Southeast Gila County, Southeast Valley/Queen Creek, Superior, Tonopah Desert, Tonto Basin and West Pinal County. * WHEN...From Thursday afternoon through Thursday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
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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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