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 is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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