Weather Alert in Arizona
Flash Flood Warning issued July 3 at 2:34PM MST until July 3 at 4:30PM MST by NWS Tucson AZ
AREAS AFFECTED: Pima, AZ
DESCRIPTION: FFWTWC The National Weather Service in Tucson has issued a * Flash Flood Warning for... Eastern Pima County in southeastern Arizona... * Until 430 PM MST. * At 234 PM MST, Doppler radar indicated between 0.75 and 1.25 inches of rain has fallen along Nogales Highway near Summit. Flash flooding is ongoing or expected to begin shortly, especially drainages that fill into Franco Wash and Flato Wash. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Tucson, Drexel Heights, Pascua Pueblo Yaqui Reservation, San Xavier Community, Summit, Tucson International Airport and San Xavier Mission. This includes Interstate 19 between mile markers 51 and 57. This includes the following Flash Flood Prone Locations... Country Club Rd at Franco Wash and Old Vail COnnection Rd at Franco Wash.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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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
Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
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