Weather Alert in Arizona
Flood Watch issued August 25 at 2:35AM MST until August 25 at 7:00PM MST by NWS Tucson AZ
AREAS AFFECTED: Western Pima County Including Ajo/Organ Pipe Cactus National Monument; Tohono O'odham Nation including Sells; Upper Santa Cruz River and Altar Valleys including Nogales; Tucson Metro Area including Tucson/Green Valley/Marana/Vail; South Central Pinal County including Eloy/Picacho Peak State Park; Santa Catalina and Rincon Mountains including Mount Lemmon/Summerhaven; Baboquivari Mountains including Kitt Peak
DESCRIPTION: * WHAT...Scattered showers and thunderstorms will be developing early this afternoon across eastern Pima and Santa Cruz counties and push to the west northwest across the lower deserts of Pima and south-central Pinal county. Some of these thunderstorms will be capable of producing very heavy rain in a short period of time leading to the potential of flash flooding. * WHERE...A portion of Southeast Arizona, including the following areas, Baboquivari Mountains, Catalina and Rincon Mountains, South Central Pinal County, Tohono O'odham Nation, Tucson Metro Area, Upper Santa Cruz River Valley/Altar Valley and Western Pima County. * WHEN...From 1 PM MST this afternoon through this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * 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 Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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