Weather Alert in Arizona
Flash Flood Warning issued July 15 at 5:56PM MST until July 15 at 9:00PM MST by NWS Flagstaff AZ
AREAS AFFECTED: Coconino, AZ
DESCRIPTION: FFWFGZ The National Weather Service in Flagstaff has issued a * Flash Flood Warning for... Coconino County in north central Arizona...This includes the Colorado River between mile markers 92 and 108. * Until 900 PM MST. * At 556 PM MST, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1.5 and 2.5 inches of rain have fallen. Additional rainfall amounts of 1 to 2 inches 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...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, normally dry washes, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Point Sublime, Pima Point, Grand Canyon National Park and Grand Canyon Village. This includes the Colorado River between mile markers 92 and 108. This includes the following creeks, washes and rivers... Garnet Canyon, Boucher Creek, Turquoise Canyon, 94- Mile Creek, 91- Mile Creek, Copper Canyon, Monodnock Amphitheater, Ninetyone Mile Creek, Tuna Creek, Heather Wash, Trinity Creek, Colorado River, Serpentine Canyon, Travertine Canyon, Bass Canyon, Shinumo Creek, Pasture Wash, Salt Creek, Emerald Canyon, Prairie Wash, Crystal Creek, Ruby Canyon, Slate Creek, Sapphire Canyon, Agate Canyon, Monument Creek, Hermit Creek and Hotauta Canyon.
INSTRUCTION: Flooding of washes and creeks will occur, some dirt roads will become muddy and impassable. Paved roads and underpasses could become flooded as well.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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