Weather Alert in Montana
Flash Flood Watch issued August 26 at 2:53AM MDT until August 28 at 12:00AM MDT by NWS Great Falls MT
AREAS AFFECTED: Missouri Headwaters; Madison River Valley; Beaverhead and Western Madison below 6000ft; Ruby Mountains and Southern Beaverhead Mountains; Gallatin and Madison County Mountains and Centennial Mountains
DESCRIPTION: * WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the recent burn scars across Madison County. Rainfall amounts of 1 to 2 inches are possible in less than one hour from thunderstorms. * WHERE...The recent burn scars across Madison County, with the greatest impacts from debris flow possible on the Cloudrest, Bivens Creek, and McAllister burn scars. * WHEN...From Wednesday afternoon through Wednesday evening. * IMPACTS...Heavy rainfall over the recent burn scars across Madison County is expected up to and during the period of the watch. Residents near the recent burn scars across Madison County 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 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 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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