A late-season surge of monsoon moisture was already in place when the remnant circulation of former Atlantic Hurricane Dean moved over southern Nevada during the pre-dawn hours of August 27th, resulting in major flooding. Damage figures were not available at this time, but will likely run well into the millions.
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.
A late-season surge of monsoon moisture was already in place when the remnant circulation of former Atlantic Hurricane Dean moved over southern Nevada during the pre-dawn hours of August 27th, resulting in major flooding. Damage figures were not available at this time, but will likely run well into the millions. In addition, there were 22 swift water rescues in the Las Vegas Valley during the height of the flooding. Despite the magnitude of the flooding, no deaths or serious injuries were reported.
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 27, 1:10 AM PST, 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 210 AM PDT MON AUG 27 2007 .SYNOPSIS...AN UPPER LEVEL DISTURBANCE COMBINED WITH A MOIST AND UNSTABLE AIR MASS WILL LEAD TO ISOLATED TO SCATTERED THUNDERSTORMS TODAY. HIGH PRESSURE ALOFT WILL GRADUALLY BUILD BACK OVER THE AREA DURING THE MIDDLE TO LATTER PART OF THE WEEK. THE AIR MASS WILL GRADUALLY DRY OUT AND WARM UP WITH TEMPERATURES WELL ABOVE NORMAL BY THURSDAY. ISOLATED AFTERNOON THUNDERSTORMS WILL STILL BE POSSIBLE OVER MAINLY THE MOUNTAINS TUESDAY AND WEDNESDAY. && .SHORT TERM...MOIST AND UNSTABLE AIR MASS OVER THE FORECAST AREA TODAY. UPPER LEVEL DISTURBANCE OVER CALIFORNIA EARLY THIS MORNING HELPING TO KICK OFF QUITE A BIT OF THUNDERSTORM ACTIVITY WHICH WILL CONTINUE TODAY...ESPECIALLY NORTH AND EAST OF LAS VEGAS. UPPER HIGH WILL GRADUALLY BUILD TOWARD THE WEST TOWARD THE AREA TUESDAY AND WEDNESDAY WITH THE AIR MASS GRADUALLY BECOMING DRIER AND MORE STABLE. ISOLATED THUNDERSTORMS ARE STILL EXPECTED OVER THE MOUNTAINS. .LONG TERM...MODELS CONTINUE TO SHOW HIGH PRESSURE SETTING UP OVER ARIZONA ALLOWING FOR SIGNIFICANT WARMING ACROSS THE CWA FOR MUCH OF THE WEEK. TEMPERATURES ARE EXPECTED TO BE SEVERAL DEGREES ABOVE NORMAL...BUT THINK THAT THEY WILL REMAIN BELOW RECORD LEVELS WHICH ARE RIGHT AROUND 110 DEGREES. MODELS STILL DEPICT MOISTURE TRAPPED UNDER THE HIGH AND THINK THAT A FEW STORMS MAY DEVELOP OVER THE HIGHER TERRAIN OF MOHAVE COUNTY. THE HIGH DOES WEAKEN SLIGHTLY TOWARD THE END OF THE EXTENDED PERIOD AS A UPPER LOW APPROACHES THE PACNW COAST. TEMPERATURES HOWEVER ARE EXPECTED TO REMAIN ABOVE NORMAL THROUGH THE ENTIRE EXTENDED PERIOD. .AVIATION...FOR MCCARRAN...ISOLATED THUNDERSTORMS ACROSS THE VALLEY AND SURROUNDING CORRIDORS THIS MORNING. GUSTY WINDS TO 20 KTS ALONG WITH CIGS NEAR 6K FEET ARE LIKELY. THUNDERSTORMS ARE FORECAST TO DISSIPATE AFTER SUNRISE...BUT ONCE AGAIN BECOMING SCATTERED IN THE AFTERNOON. FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST CALIFORNIA...SCATTERED THUNDERSTORMS WILL CONTINUE THROUGH 12Z TONIGHT OVER PORTIONS ON LINCOLN AND NYE COUNTIES. THUNDERSTORMS ARE EXPECTED TO DECREASE AFTER 12Z...BUT SCATTERED THUNDERSTORMS WILL ONCE AGAIN DEVELOP AFTER 19Z ACROSS THE REGION. .VEF WATCHES/WARNINGS/ADVISORIES... .NV...NONE. .AZ...NONE. .CA...NONE. && HARRISON/GORELOW HTTP://WEATHER.GOV/LASVEGAS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAS VEGAS NV 226 AM PDT MON AUG 27 2007 AZZ001>003-036-CAZ519>527-NVZ014>022-280600- 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- 226 AM PDT MON AUG 27 2007 /226 AM MST MON AUG 27 2007/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST ARIZONA...CALIFORNIA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT A MOIST AND UNSTABLE AIR MASS COMBINED WITH AN UPPER LEVEL DISTURBANCE MOVING THROUGH THE AREA WILL LEAD TO ISOLATED TO SCATTERED THUNDERSTORMS...ESPECIALLY NORTH AND EAST OF LAS VEGAS. BRIEF HEAVY RAIN IS LIKELY WITH STORMS AND LOCALIZED FLOODING OF ROADWAYS AND LOW LYING AREAS IS POSSIBLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY HIGH PRESSURE ALOFT WILL GRADUALLY BUILD OVER THE AREA WITH THE AIR MASS BECOMING DRIER AND MORE STABLE. ISOLATED THUNDERSTORMS WILL STILL BE POSSIBLE OVER THE MOUNTAINS TUESDAY AND WEDNESDAY. TEMPERATURES MAY REACH EXCESSIVE HEAT WARNING LEVELS ACROSS THE LOWER DESERTS BY THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. HOWEVER SPOTTERS ARE ENCOURAGED TO REPORT ANY HAZARDOUS WEATHER THAT MAY BE ENCOUNTERED TODAY AND THIS EVENING.
The Las Vegas radar (KESX), 57 km away, was scanning. The volume nearest the first event began at 10:09 UTC.
1 flash flood, 1 lightning. Local standard time, as filed.
Flash flooding resulted in 22 swift water rescues in less than three hours. Floodwaters knocked down a 45-foot stretch of stucco wall behind an apartment complex, inundating garages with two feet of water. Many homes had water in them. The damage figure is an estimate.
The same storms which were responsible for major flooding also produced lightning strikes which set fire to at least ten buildings and more than 20 trees. Damage figure is an estimate.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2007Every state in 2007This day in weather historyWarnings in Nevada, August 2007
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: 55834, 55835.