Weather Alert in Arizona
Flash Flood Warning issued August 26 at 5:49PM MST until August 27 at 12:00AM MST by NWS Flagstaff AZ
AREAS AFFECTED: Coconino, AZ
DESCRIPTION: FFWFGZ The National Weather Service in Flagstaff has extended the * Flash Flood Warning for... Northern Coconino County in north central Arizona... * Until midnight MST /100 AM MDT Wednesday/. * At 547 PM MST /647 PM MDT/, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life-threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar. IMPACT...Life-threatening flash flooding of low-water crossings, creeks, normally dry washes and roads. * Some locations that will experience flash flooding include... Paria Canyon, Lee's Ferry CG, Paria Beach, Lee's Ferry, Lees Ferry, Paria River Slot Canyon, Glen Canyon National Recreation Area, Grand Canyon National Park and Navajo Reservation. This includes the following creeks, washes and rivers... Colorado River and Paria 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. Normally dry washes, slot canyons and creeks can become raging killer currents in a matter of minutes, even from distant rainfall.
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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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