Weather Alert in Wyoming
Flash Flood Warning issued August 2 at 9:16PM MDT until August 2 at 10:30PM MDT by NWS Billings MT
AREAS AFFECTED: Sheridan, WY
DESCRIPTION: At 916 PM MDT, Doppler radar indicated thunderstorms producing heavy rain over the Northern Elk Burn Area. Up to 1.5 inches of rain have fallen. Flooding impacts will continue, but no additional rainfall is expected. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flows. The debris flows can consist of rock, mud, vegetation and other loose materials. HAZARD...Flash flooding caused by thunderstorms in and around the Northern Elk Burn Area. SOURCE...Radar indicated. IMPACT...Flooding of areas in and downstream of the Northern Elk Burn Area. Some locations that will experience flash flooding include... Dayton and Parkman.
INSTRUCTION: Life threatening flooding of creeks, roads, and normally dry coulees in and downstream of the Northern Elk burn area is likely. In addition to the flash flooding, the heavy rains may trigger rockslides, mudslides, and debris flows in steep terrain. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Do not drive on or attempt to cross flooded roads, find an alternate route. Roads and driveways may be damaged or washed out in places. Please report observed flooding to local emergency officials and request they pass the information to the National Weather Service in Billings.
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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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