Weather Alert in Utah
Flash Flood Warning issued September 12 at 9:43AM MDT until September 12 at 12:45PM MDT by NWS Grand Junction CO
AREAS AFFECTED: Grand, UT
DESCRIPTION: FFWGJT The National Weather Service in Grand Junction has issued a * Flash Flood Warning for... South Central Grand County in east central Utah... * Until 1245 PM MDT. * At 943 AM MDT, Doppler radar indicated thunderstorms producing heavy rain training over Salt Wash Valley draining through Arches National Park. Between 0.5 and 0.7 inches of rain have fallen. Additional rainfall amounts of 0.3 to 0.6 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Flash flooding of small creeks and streams, highways, streets and underpasses as well as other poor drainage and low-lying areas. This includes the following streams and drainages... Salt Wash down to the Colorado River
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Remain alert for flooding even in locations not receiving rain. Arroyos, streams, and rivers can become raging currents in a matter of minutes, even from distant rainfall. It is important to know where you are relative to streams, rivers, or creeks which can become life threatening in heavy rains. Hikers should avoid streams or creeks, climb to higher grounds. Arches National Park is prone to rockslides and flash flooding in heavy rain. Stay alert for rocks and debris on roads, and avoid driving on flooded roads.
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
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