Weather Alert in Idaho
Flash Flood Warning issued August 26 at 5:45PM MDT until August 26 at 8:45PM MDT by NWS Boise ID
AREAS AFFECTED: Boise, ID
DESCRIPTION: FFWBOI The National Weather Service in Boise has issued a * Flash Flood Warning for... Northeastern Boise County in southwestern Idaho... * Until 845 PM MDT. * At 545 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flow moving through the Wapiti Burn Scar. The debris flow can consist of rock, mud, vegetation and other loose materials. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Flash flooding of small creeks and streams, as well as other poor drainage and low-lying areas. * Locations that will experience flash flooding include... mainly rural areas of Northeastern Boise County along Idaho state Highway 21. A landslide has closed Idaho State Highway 21 between Grandjean and the Custer County line.
INSTRUCTION: Move away from recently burned areas. Life-threatening flooding of creeks, roads and normally dry washes is likely. The heavy rains will likely trigger rockslides, mudslides and debris flows in steep terrain, especially in and around these areas.
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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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