ST. GEORGE – This urgent flash flood and weather alert issues from the National Weather Service at 12:39 a.m. Wed. Aug. 22 MST.
A very moist and unstable air mass combined with an area of low pressure moving into southern California will help create the potential of widespread thunderstorms that will likely produce heavy rain and flash flooding late Wednesday morning through late Wednesday night.
Northwest Plateau-Lake Havasu And Fort Mohave-Northwest Deserts- Lake Mead National Recreation Area-Death Valley National Park- Western Mojave Desert-Eastern Mojave Desert-Morongo Basin- Cadiz Basin-San Bernardino County-Upper Colorado River Valley- Lincoln County-Northeast Clark County- Western Clark And Southern Nye County-Sheep Range-Spring Mountains-Red Rock Canyon-Las Vegas Valley-Southern Clark County-
* Flash flood watch in effect from Wednesday morning through late Wednesday night.
* FLASH FLOOD WATCH FOR PORTIONS OF Northwest Arizona California And Nevada:
In Northwest Arizona: Lake Havasu And Fort Mohave Lake Mead National Recreation Area Northwest Deserts And Northwest Plateau.
In California: Cadiz Basin Death Valley National Park Eastern Mojave Desert Morongo Basin San Bernardino County-Upper Colorado River Valley And Western Mojave Desert.
In Nevada: Lake Mead National Recreation Area Las Vegas Valley Lincoln County Northeast Clark County Sheep Range Southern Clark County Spring Mountains-Red Rockcanyon And Western Clark And Southern Nye County.
* From Wednesday morning through late Wednesday night
* A moist and unstable air mass remains in place over much of Southern Nevada Southeast California and Northwest Arizona.
In addition an area of low pressure will move inland across southern California which will help generate more widespread thunderstorms across the area. Storms that form will have the potential to produce very heavy rain and flash flooding through late Wednesday night.
* Travelers should be alert for the potential for water to cover low spots including any roads that run through washes. Rocks and mud may wash onto roads due to runoff. Dirt and gravel secondary roads may wash out or be impassible. Storm drains and flood control channels could see rapidly flowing water along with the potential for debris to collect in them. In addition runoff may cause flooding well downstream from where any rain falls.
A flash flood watch means that conditions may develop that leadto flash flooding. Flash flooding is a very dangerous situation and persons in and near the watch area should be alert to the potential for heavy rainfall.