Weather Alert in Arizona
Flash Flood Warning issued August 24 at 3:27PM MST until August 24 at 6:30PM 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 White Sage Fire scar in... Coconino County in north central Arizona... * Until 630 PM MST. * At 327 PM MST, Doppler radar indicated thunderstorms producing heavy rain over the White Sage Fire scar. Between 0.5 and 1 inch of rain has fallen. Additional rainfall amounts up to 0.5 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 in and around the White Sage Fire scar. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of areas in and around the White Sage Fire scar. * Some locations that will experience flash flooding include... Vermilion Cliffs National Monument. This includes the following creeks, washes and rivers... House Rock Wash, Coyote Wash and Rock Canyon.
INSTRUCTION: Flash flooding is occurring or imminent within the White Sage Fire scar. Campers, hunters, and hikers should move to higher ground immediately! Stay away from creeks and washes!
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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