Weather Alert in Arizona
Flash Flood Warning issued September 4 at 5:14PM MST until September 4 at 8:15PM 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 river miles 49 and 54. * Until 815 PM MST /915 PM MDT/. * At 514 PM MST /614 PM MDT/, Doppler radar indicated thunderstorms producing heavy rain over and just north of Nankoweap Creek. This is the second round of storms in this area today. 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 and normally dry washes. * Some locations that will experience flash flooding include... Grand Canyon National Park and Saddle Mountain Wilderness. This includes the Colorado River between river miles 49 and 54. This includes the following recreation areas and campgrounds... Dinosaur Camp Site, Little Nankoweap Camp Site, Upper Nankoweap Camp Site, Main Nankoweap Camp Site and Lower Nankoweap Camp Site. This includes the following creeks, washes and rivers... Nankoweap Creek, Saddle Canyon, Colorado River, Nankoweap Canyon, Tatahoysa Wash and Little Nankoweap Creek.
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 is Snow?
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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.
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Weather Topic: What are Stratus Clouds?
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Stratus clouds are similar to altostratus clouds, but form at a
lower altitude and are identified by their fog-like appearance, lacking the
distinguishing features of most clouds.
Stratus clouds are wider than most clouds, and their base has a smooth, uniform
look which is lighter in color than a nimbostratus cloud.
The presence of a stratus cloud indicates the possibility of minor precipitation,
such as drizzle, but heavier precipitation does not typically arrive in the form
of a stratus cloud.
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