Monsoon moisture fueled scattered thunderstorms over the Mojave Desert. Isolated flash flooding occurred.
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.
Monsoon moisture fueled scattered thunderstorms over the Mojave Desert. Isolated flash flooding occurred.
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 Aug 25, 1:30 PM PST, 0 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 230 PM PDT SAT AUG 25 2012 .SYNOPSIS...DRIER AIR WILL MOVE INTO THE REGION FROM THE WEST STARTING SUNDAY WHICH WILL CONFINE THUNDERSTORM CHANCES TO PRIMARILY MOHAVE COUNTY FOR SUNDAY THROUGH THE FIRST HALF OF THE WEEK. ADDITIONAL MOISTURE FROM THE SOUTH MAY PUSH THUNDERSTORM CHANCES BACK WESTWARD BY MIDWEEK. TEMPERATURES WILL REMAIN NEAR SEASONAL LEVELS. && .SHORT TERM...TODAY THROUGH MONDAY NIGHT...SURFACE DEWPOINT TEMPERATURES HAVE DECREASED SLIGHTLY ACROSS MUCH OF THE AREA...BUT REMAIN IN THE 50S TO AROUND 60 EAST OF A LINE FROM BARSTOW TO DESERT ROCK TO JUST EAST OF ELY. THUNDERSTORMS HAVE ONCE AGAIN DEVELOPED OVER THE HIGHER TERRAIN IN THE MORE JUICY AIR LOCATED OVER CLARK... LINCOLN...AND MOHAVE COUNTIES. THESE STORMS ARE CAPABLE OF BRIEF HEAVY DOWNPOURS AND OVER AN INCH OF RAINFALL IN AN HOUR UNDER THE MOST INTENSE CELLS. DUE TO LITTLE IN THE WAY OF DYNAMICS...THESE STORMS ARE OUTFLOW DOMINATED AND UNORGANIZED AND SHOULD DECREASE RAPIDLY AFTER SUNSET. INCREASING GRADIENT OVER NORTHWEST PORTION OF THE FORECAST AREA WILL KEEP GUSTY SOUTHERLY WINDS GOING IN OWENS VALLEY AND SURROUNDING AREAS THROUGH SUNSET AS WELL. APPROACHING TROUGH NEAR THE NORTHWEST COAST WILL SLIDE FURTHER DOWN THE WEST COAST AND ENHANCE SOUTHWEST FLOW OVER THE REGION SUNDAY AND MONDAY. DRIER AIR WILL MOVE INTO THE REGION FROM WEST TO EAST. HOWEVER EVEN BY MONDAY...MOISTURE WILL NOT TOTALLY BE SCOURED OUT OF MOHAVE COUNTY...SO LEFT A SLIGHT CHANCE OF SHOWERS IN THE FAR NORTHEAST CORNER. AS THIS TROUGH APPROACHES...AFTERNOON AND EVENING SOUTHERLY WINDS UP THE OWENS VALLEY WILL REDEVELOP SUNDAY AND MONDAY. TEMPERATURES ACROSS THE AREA WILL BE NEAR SEASONAL NORMALS. LITTLE CHANGE MADE TO PREVIOUS FORECAST GRIDS. .LONG TERM...THE MAIN QUESTION FOR THE EXTENDED PERIOD CONTINUES TO BE HOW FAR WEST WILL MOISTURE PUSH AS HIGH PRESSURE STRENGTHENS NEAR COLORADO AND TAPS ADDITIONAL MOISTURE IN MEXICO. ECMWF CONTINUES TO BE MORE BULLISH ON MOISTURE SCENARIO AND HAS PERFORMED WELL IN THE PAST UNDER SIMILAR PATTERNS...SO HAVE BUMPED POPS UP SLIGHTLY FOR THE LAST HALF OF THE WEEK ACROSS LINCOLN...CLARK... MOHAVE...AND EASTERN SAN BERNARDINO COUNTIES. ADDITIONAL MOISTURE AND CLOUDS THE LAST HALF OF THE WEEK SHOULD DROP HIGH TEMPERATURES A FEW DEGREES AND THIS HAS BEEN REFLECTED IN THE FORECAST. ANOTHER LOW PRESSURE TROUGH EXPECTED TO EXTEND DOWN THE WEST COAST BY NEXT WEEKEND...WHICH COULD INITIATE ANOTHER DRYING TREND OVER THE AREA. OVERALL NOT A LOT OF CHANGE TO THE FORECAST PACKAGE IN THE EXTENDED PERIOD EXCEPT FOR THE AFOREMENTIONED SLIGHT BOOST TO POPS AND TO SKY COVER. && .AVIATION...FOR MCCARRAN...WINDS SHOULD FAVOR TYPICAL DIURNAL DIRECTIONS THROUGH SUNDAY. ISOLATED SHRA/TSRA THIS AFTERNOON OVER THE MOUNTAINS AROUND THE LAS VEGAS VALLEY AND IN THE APPROACH CORRIDORS WILL END THIS EVENING BY 04Z. FEW-SCT CLOUDS AOA 8K FEET THIS EVENING TO CLEAR BY 06Z. TEMPS ARE FORECAST TO REACH AND REMAIN NEAR 100F SUNDAY BETWEEN 22Z TO 01Z. LESS CLOUDS ARE EXPECTED SUNDAY WITH LITTLE TO NO CHANCE FOR TSRA. FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST CALIFORNIA...WINDS SHOULD FAVOR TYPICAL DIURNAL TRENDS THROUGH SUNDAY...WITH THE POTENTIAL FOR GUSTY ERRATIC WINDS NEAR ANY TSRA. STRONGER SOUTHERLY WINDS IN AND NEAR OWENS VALLEY WITH GUSTS AOA 25KT IN THE AFTERNOONS. ISOLATED SHRA/TSRA TO CONTINUE THROUGH 03Z SUNDAY MAINLY ACROSS THE HIGHER ELEVATIONS OF MOHAVE...CLARK... AND LINCOLN COUNTIES WITH FEW-SCT CLOUDS AOA 8K FEET AT TIMES. TSRA TO REDEVELOP SUNDAY BUT WILL BE CONFINED TO EXTREME EASTERN MOHAVE AND LINCOLN COUNTIES. && .VEF WATCHES/WARNINGS/ADVISORIES... NV...NONE. AZ...NONE. CA...NONE. && STAUDENMAIER HTTP://WEATHER.GOV/LASVEGAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAS VEGAS NV 325 AM PDT SAT AUG 25 2012 AZZ001>003-036-CAZ519>527-NVZ014>022-261000- 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- 325 AM PDT SAT AUG 25 2012 /325 AM MST SAT AUG 25 2012/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST ARIZONA...CALIFORNIA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .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 Las Vegas radar (KESX), 69 km away, was scanning. The volume nearest the first event began at 21:29 UTC.
1 flash flood. Local standard time, as filed.
The Red Rock Scenic Loop was flooded and closed. One vehicle was nearly swept away.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2012Every state in 2012This day in weather historyWarnings in Nevada, August 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: 400924.