Weather Alert in Montana
Flash Flood Watch issued August 27 at 1:59AM MDT until August 28 at 12:00AM MDT by NWS Great Falls MT
AREAS AFFECTED: Northwest Beaverhead County
DESCRIPTION: * WHAT...Flash flooding and debris flows caused by excessive rainfall continue to be possible over the Big Hollow, Grouse, Sawlog, and South Fork burn scars. Rainfall amounts of 1 to 2 inches are possible in less than one hour from thunderstorms. * WHERE...A portion of southwest Montana, including the following area, Northwest Beaverhead County. * WHEN...From 9 AM MDT this morning through this evening. * IMPACTS...Heavy rainfall over the Big Hollow, Grouse, Sawlog, and South Fork burn scars is expected up to and during the period of the watch. Residents near the Big Hollow, Grouse, Sawlog, and South Fork burn scars should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding of low-lying areas, urbanized street flooding, and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over the burn scar, which may lead to flash flooding and debris flows. - http://www.weather.gov/safety/flood
INSTRUCTION: PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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