Another push of monsoon moisture led to more thunderstorms over the Mojave Desert and southern Great Basin. A few storms produced severe weather and/or flash flooding.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS VEF wrote it up.
Another push of monsoon moisture led to more thunderstorms over the Mojave Desert and southern Great Basin. A few storms produced severe weather and/or flash flooding.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Las Vegas, NV wrote its last area forecast discussion before the first event at Jul 24, 10:20 AM MST, 4 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 1020 AM PDT TUE JUL 24 2012 .SYNOPSIS...MONSOON MOISTURE WILL REMAIN OVER MAINLY THE EASTERN PORTION OF THE AREA TODAY FOR A CHANCE OF THUNDERSTORMS. HOWEVER DRYING FROM THE WEST WILL MOVE OVER THE AREA ON WEDNESDAY WITH DRY CONDITIONS THEN REMAINING IN PLACE THROUGH THE UPCOMING WEEKEND WITH TEMPERATURES NEAR NORMAL. && .UPDATE...THUNDERSTORMS ARE CONFINED TO MOHAVE COUNTY AT THE TIME OF THIS UPDATE AND ARE DEPICTED WELL IN THE GRIDS. DRIER CONDITIONS ARE MOVING INTO THE WESTERN CWA AS HIGH PRESSURE BUILDS INTO SOUTHERN CALIFORNIA. THE AMOUNT OF WARMING...BOTH ALOFT AND AT THE SURFACE AND DRYING THROUGH THE LAYER...WILL LARGELY DETERMINE WHETHER THUNDERSTORMS DEVELOP IN CLARK COUNTY TODAY. GRIDS HANDLE THE CURRENT AND EXPECTED WEATHER FOR TODAY SO NO UPDATES PLANNED AT THIS TIME. && .PREVIOUS DISCUSSION...300 AM PDT... .SHORT TERM...TODAY THROUGH THURSDAY NIGHT...A WEAK LOW OVER CENTRAL CALIFORNIA AND A DRY AIR BOUNDARY APPEAR TO BE THE MAIN INITIATOR OF ISOLATED CONVECTION THAT IS CONTINUING OVER THE EASTERN PORTION OF THE CWA THIS MORNING. AS BOTH THESE FEATURES SHIFT EAST...EXPECT CONVECTION TO CONTINUE. THE MAIN CONCERN THEN BECOMES HOW FAR EAST WILL THE DRIER AIR MOVE BY THIS AFTERNOON. ALTHOUGH HAVE KEPT A CHANCE OF THUNDERSTORMS OVER LINCOLN/CLARK/MOHAVE COUNTY THROUGH THIS EVENING...DAY SHIFT MAY NEED TO ADJUST AS CONVECTION MAY BE LIMITED TO ONLY MOHAVE/EASTERN PORTION OF LINCOLN COUNTY AS MORE STABLE CONDITIONS MOVE INTO THE REGION. BY WEDNESDAY A HIGH PRESSURE SYSTEM OVER SOUTHERN CALIFORNIA STARTS TO BECOME THE DOMINANT FEATURE FOR THE SHORT TERM. MODELS ARE IN VERY GOOD AGREEMENT THAT THE MAIN FOCUS OF THUNDERSTORM ACTIVITY WILL BE EAST AND SOUTH OF THE CWA AS POSITIVE LIS MOVE OVER EVEN LINCOLN/MOHAVE COUNTIES BY 00Z THURSDAY WITH PRECIPITABLE WATER VALUES DROPPING TO BETWEEN HALF AND THREE QUARTERS OF AN INCH DUE TO THE SOUTHERN CA RIDGE BUILDING OVER THE AREA. ALTHOUGH THERE WILL LIKELY BE CUMULUS AROUND ON WEDNESDAY...HAVE REMOVED MENTIONED OF THUNDERSTORMS DUE TO THE DRYING/STABILIZING. THIS TO THEN CONTINUE INTO THURSDAY AS THE RIDGE CONTINUES TO SHIFT EAST AND DRY SOUTHWEST FLOW ALOFT MOVES OVER THE AREA. WITH THE ANTICIPATED DRYING...TEMPERATURES WILL BE NEAR NORMAL THROUGH THE SHORT TERM. .LONG TERM...DRY AND STABLE SOUTHWEST FLOW LOOKS TO BE IN PLACE FRIDAY AND THROUGH THE WEEKEND ACROSS THE FORECAST AREA...WITH PWAT VALUES RANGING BETWEEN .25 AND .50 INCHES ACROSS THE REGION. MODELS STILL INDICATE A SHORTWAVE APPROACHING FROM THE EAST AND FORECAST TO PASS SOUTH OF THE AREA LATE NEXT WEEKEND AND EARLY NEXT WEEK...WHICH WILL EVENTUALLY RESULT IN SUFFICIENT MOISTURE ADVECTION OUT OF THE SOUTHEAST FOR THUNDERSTORMS. HAVE KEPT THE FORECAST DRY FOR SUNDAY...BUT HAVE SLIGHT CHANCES FOR THUNDERSTORMS ACROSS MOHAVE COUNTY NEXT MONDAY AND TUESDAY. THIS HAS BEEN A PRETTY CONSISTENT FEATURE...AND FURTHER OUT...OVERALL CONSENSUS POINTS TO MONSOONAL MOISTURE BEING IN PLACE ACROSS A LARGE PORTION OF THE FORECAST AREA BY THE MIDDLE OF NEXT WEEK. && .AVIATION...FOR MCCARRAN...ANY CU DEVELOPMENT LOOKS LIKELY TO BE CAPPED OFF AROUND 20KFT TODAY BASED ON LATEST MODEL GUIDANCE...SO DO NOT EXPECT ANY THUNDERSTORMS AT KLAS TODAY. WINDS WILL BE LIGHT BEFORE PICKING UP LATE THIS MORNING AS SLIGHTLY STRONGER SOUTHWESTERLY WINDS THAN OBSERVED THE PREVIOUS COUPLE DAYS MIX DOWN TO THE SURFACE. WIND GUSTS WILL BE AROUND 20KTS ON AVERAGE THROUGH THE AFTERNOON. TEMPERATURES ARE EXPECTED TO BE AT OR ABOVE 100F FROM 19Z THROUGH 03Z TODAY. FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST CALIFORNIA...THUNDERSTORMS ARE EXPECTED TO BE CONFINED TO EASTERN MOHAVE AND LINCOLN COUNTIES TODAY...MAINLY FROM KINGMAN AND GRAND CANYON WEST AIRPORTS AND EAST...AS DRIER MORE STABLE AIR WORKS INTO THE REGION. SOUTHWEST WINDS WILL INCREASE BY LATE THIS MORNING..WITH GUSTS AROUND 20-25KTS ON AVERAGE THROUGH THE AFTERNOON. && .VEF WATCHES/WARNINGS/ADVISORIES... NV...NONE. AZ...NONE. CA...NONE. && SALMEN HTTP://WEATHER.GOV/LASVEGAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAS VEGAS NV 526 AM PDT TUE JUL 24 2012 AZZ001>003-036-CAZ519>527-NVZ014>022-250330- NORTHWEST PLATEAU-LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS- LAKE MEAD NATIONAL RECREATION AREA-EASTERN SIERRA SLOPES- OWENS VALLEY-WHITE MOUNTAINS OF INYO COUNTY- DEATH VALLEY NATIONAL PARK-WESTERN MOJAVE DESERT- EASTERN MOJAVE DESERT-MORONGO BASIN-CADIZ BASIN- SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY- ESMERALDA AND CENTRAL NYE COUNTY-LINCOLN COUNTY- NORTHEAST CLARK COUNTY-WESTERN CLARK AND SOUTHERN NYE COUNTY- SHEEP RANGE-SPRING MOUNTAINS-LAS VEGAS VALLEY- SOUTHERN CLARK COUNTY- 526 AM PDT TUE JUL 24 2012 /526 AM MST TUE JUL 24 2012/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST ARIZONA...CALIFORNIA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS WILL CONTINUE TO BE SEEN THROUGH TONIGHT...MAINLY ACROSS MOHAVE AND LINCOLN COUNTIES AS DRIER/MORE STABLE AIR BEGINS TO MOVE INTO THE REGION FROM THE WEST. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. DRIER AIR WILL MOVE OVER THE ENTIRE REGION ON WEDNESDAY...RESULTING IN THUNDERSTORM CHANCES BEING PUSHED EAST AND SOUTH OF THE AREA. THE DRIER AIR WILL THEN REMAIN IN PLACE THROUGH THE UPCOMING WEEKEND AND INTO MONDAY...BEFORE MOISTURE MAY RETURN TO THE AREA NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER... SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Cedar City radar (KICX), 123 km away, was scanning. The volume nearest the first event began at 21:28 UTC.
1 flash flood. Local standard time, as filed.
Flash flooding washed out several back country roads in the Grand Canyon-Parashant National Monument.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2012Every state in 2012This day in weather historyWarnings in Arizona, July 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 394321.