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Portions of East-central Arizona and South-central Arizona. Including the following areas, in East-central Arizona, southern Gila County/tonto National Forest foothills. In South-central Arizona, Greater Phoenix area and Northwest Maricopa County. Until 5 pm MST this afternoon. Showers and thunderstorms are moving east of the Phoenix metro area late this morning. Flooding of roads will continue through this afternoon. Many local roads and some major interstates remain closed late this morning. Stay Up-to-date on the latest forecasts by listening to weather radio on the public service band. More detailed information is available from the National Weather Service in Phoenix on the Internet at weather.gov/phoenix.
Earlier on Monday, at least one person was killed in Tucson when a vehicle was washed away by floodwaters, according to KVOA.com.
"The richest plume of moisture from former Hurricane Norbert is pointing straight north through the Lower Colorado River Valley and into southern Nevada. Rainfall has been wildly variable but over 1 inch of rain fell in a short time in the southwest part of the Las Vegas Valley Monday," said weather.com meteorologist Nick Wiltgen. "More troubling were the storms northeast of the city; one gauge reported 2 inches of rain in 30 minutes north of Moapa. This is an extreme amount of rain for a desert environment. NOAA estimates this type of rainfall should happen once every 500 to 1,000 years in that area, assuming no climate change."
Record rain produced dangerous flash floods that swamped freeways and residential areas in the Las Vegas and Phoenix metro areas on Monday. In Nevada, life-threatening flash flooding was reported in Moapa, about 45 miles northwest of Las Vegas on Monday afternoon and a flash flood emergency was declared for the area. The National Weather Service in Las Vegas said in a statement that a dam in the community was within inches of overtopping. Residents were advised to seek higher ground.
The National Weather Service in Las Vegas has issued a Flash Flood Warning for: Central Clark County in Southern Nevada. Until 6:30 pm PDT. At 3:20 pm PDT, National Weather Service Doppler radar indicated flash flooding from a thunderstorm near Spring Mountain Ranch, or near Red Rock Canyon. Over a half of an inch of rain is expected in this area. This will cause new areas of flash flooding or wash any mud and rocks still on streets from earlier today around especially in the southwest part of the Las Vegas Valley. Locations impacted include: Red Rock Canyon, Downtown Las Vegas, Red Rock Canyon campground, Rocky Gap campground, Spring Valley, Mccarran International Airport, the strip and Unlv.
According to NOAA's precipitation frequency estimate, this heavy a precipitation event in a six-hour time period has only a 0.002 percent chance of occurring in any given year. The roof of a Fry's Marketplace reportedly collapsed in Tempe, and there was a report of an evacuation of an apartment at Arizona State University. One spotter in Chandler, Arizona, measured 5.63 inches of rain as of 10 a.m. MST. The desert terrain is already incapable of holding several inches of water, but when heavy rainfall hits urban areas in the southwest – developed and covered in concrete, which doesn't absorb water, either – a catastrophic situation can occur. The threat is expected to continue through Monday, and the NWS has issued flash-flood watches for parts of five states – California, Arizona, Utah, Nevada and Colorado. Early Monday morning, a large cluster of storms was centered over Arizona, forcing the NWS to issue flood warnings for some parts of the state.
At least two people died in the flooding, including a woman who was swept away in her car by rushing water and became trapped against a bridge. In addition, a 76-year-old woman drowned in floodwaters.
originally posted by: graceunderpressure
If you're anywhere in or near the affected area, please be careful. I've been caught in a flash flood before at night on a rural road. The driver just thought it was a wet roadway until water started gushing up through the Toyota's floorboard. We were lucky to escape alive.