Weather Alert in Colorado
Flash Flood Warning issued September 11 at 2:44PM MDT until September 11 at 5:45PM MDT by NWS Grand Junction CO
AREAS AFFECTED: Rio Blanco, CO
DESCRIPTION: FFWGJT The National Weather Service in Grand Junction has issued a * Flash Flood Warning for... The Lee burn scar in... Central Rio Blanco County in northwestern Colorado... * Until 545 PM MDT. * At 244 PM MDT, Doppler radar indicated thunderstorms producing heavy rain over the Lee Burn Scar. The expected rainfall rate is 1 to 2 inches in 1 hour. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flow moving through Piceance Creek. The debris flow can consist of rock, mud, vegetation and other loose materials. HAZARD...Dangerous flash flooding. Thunderstorms producing flash flooding/debris flows in and around the Lee Burn Scar. SOURCE...Radar. IMPACT...Dangerous flash flooding of areas in and around the Lee Burn Scar. * Some locations that will experience flash flooding include... mainly rural areas of Central Rio Blanco County and portions of County Road 5 This includes the following streams and drainages... Dry Fork Piceance Creek, East Fork Stewart Gulch, Piceance Creek, Hay Gulch, Dry Thirteenmile Creek and White River.
INSTRUCTION: This is a dangerous situation. Heavy rainfall will cause flash flooding of creeks...streams...and ditches in the Lee Burn Scar. Debris flows can also be anticipated across roads. Roads and driveways may be washed away in places. If you encounter flood waters...climb to safety.
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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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