Weather Alert in Arizona
Flash Flood Warning issued September 4 at 12:09PM MST until September 4 at 6:15PM MST by NWS Flagstaff AZ
AREAS AFFECTED: Coconino, AZ
DESCRIPTION: FFWFGZ The National Weather Service in Flagstaff has issued a * Flash Flood Warning for... The North Canyon Wash Basin downstream of the Dragon Bravo Fire scar in...Coconino County in north central Arizona...this includes the Colorado River between mile markers 17 and 21. * Until 615 PM MST /715 PM MDT/ Thursday. * At 1209 PM MST /109 PM MDT/, Doppler radar indicated thunderstorms producing heavy rain over the North Canyon Wash Basin downstream of the Dragon Bravo Fire scar. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flow moving through the North Canyon Wash. The debris flow can consist of rock, mud, vegetation and other loose materials. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding in and around the North Canyon Wash Basin downstream of the Dragon Bravo Fire scar. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of areas in and around the North Canyon Wash Basin downstream of the Dragon Bravo Fire scar. * Some locations that will experience flash flooding include... Grand Canyon National Park and Saddle Mountain Wilderness. This includes the Colorado River between mile markers 17 and 21. This includes the following recreation areas and campgrounds... House Rock Camp Site, 18 Mile Wash Camp Site, 18 Mile Ledges Camp Site, Upper North Canyon Camp Site and Lower North Canyon Camp Site. This includes the following creeks, washes and rivers... North Canyon, "18- Mile Wash", "19- Mile Canyon", Colorado River, South Canyon, House Rock Wash, Hanaa Ninadzidzahi and North Canyon Wash.
INSTRUCTION: Flash flooding is occurring or imminent downstream of the Dragon Bravo Fire scar. Severe debris flow are expected across roads and in remote canyon drainages on the Kaibab Plateau east of State Route 67. Campers and hikers should get away from creeks and move to higher ground immediately! Stay away or be swept away!
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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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