Weather Alert in Arizona
Flash Flood Warning issued August 25 at 4:40PM MST until August 25 at 7:45PM MST by NWS Tucson AZ
AREAS AFFECTED: Pima, AZ; Pinal, AZ
DESCRIPTION: FFWTWC The National Weather Service in Tucson has issued a * Flash Flood Warning for... North Central Pima County in southeastern Arizona... South Central Pinal County in southeastern Arizona... * Until 745 PM MST. * At 440 PM MST, gauge reports in Red Rock and Marana indicated thunderstorms producing heavy rain across the warned area. Between 1.5 and 2 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Gauges reported. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Marana, Avra Valley, Pinal Airpark, Picacho Peak State Park, Picture Rocks, Red Rock and Dove Mountain. This includes Interstate 10 between mile markers 217 and 241. This includes the following Flash Flood Prone Locations... Sasco Rd at Santa Cruz Wash, Park Link Dr between I-10 and HWY 79 and Twin Peaks Rd between Sanders and Sandario.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. Remain alert for flooding even in locations not receiving rain. Washes, streams, and rivers can become raging killer currents in a matter of minutes, even from distant rainfall.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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