Weather Alert in Arizona
Flash Flood Warning issued August 25 at 2:09PM MST until August 25 at 5:15PM MST by NWS Tucson AZ
AREAS AFFECTED: Santa Cruz, AZ
DESCRIPTION: FFWTWC The National Weather Service in Tucson has issued a * Flash Flood Warning for... South Central Santa Cruz County in southeastern Arizona... * Until 515 PM MST. * At 209 PM MST, gauge reports indicated thunderstorms producing heavy rain in Nogales. Between 0.8 and 1 inch of rain has fallen. Additional rainfall of 1 to 2 inches is expected within the next 3 hours. 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... Nogales. This includes the following highways... Interstate 19 between mile markers 1 and 7. Route 82 between mile markers 1 and 5. This includes the following Flash Flood Prone Locations... Nogales Wash at Doe St Bridge.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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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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