Heavy rain caused flash flooding in Antelope Canyon during the night.
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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 FGZ wrote it up.
Heavy rain caused flash flooding in Antelope Canyon during the night.
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 Flagstaff, AZ wrote its last area forecast discussion before the first event at Aug 5, 9:05 PM MST, 2 hours 56 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 905 PM MST THU AUG 5 2010 .SYNOPSIS...EXPECT ISOLATED TO SCATTERED THUNDERSTORMS TO CONTINUE THROUGH FRIDAY...MAINLY ALONG AND NORTH OF THE MOGOLLON RIM. AN INCREASE IN THUNDERSTORM ACTIVITY IS EXPECTED OVER THE WEEKEND AS LOW PRESSURE OVER THE WEST COAST DRAWS DEEP MONSOON MOISTURE NORTHWARD ACROSS ARIZONA. A MORE SIGNIFICANT DRYING TREND IS LIKELY BEGINNING EARLY NEXT WEEK. && .DISCUSSION...WIDELY SCATTERED CONVECTION STILL PERSISTS ROUGHLY ALONG AND EAST OF A LINE FROM PAGE...TO KYKOTSMOVI...TO SHOW LOW...WITH STORMS ILLUSTRATING LITTLE OVERALL DECREASE IN INTENSITY AT THIS TIME. EXPECT THIS ACTIVITY TO CONTINUE FOR A FEW MORE HOURS THIS EVENING...DIMINISHING AFTER MIDNIGHT. MODELS CONTINUE TO INDICATE AN UPSWING IN CONVECTION LATE FRIDAY THROUGH SATURDAY...AS THE WEST COAST TROUGH CONTINUES TO STRENGTHEN AND DRAW DEEP SUBTROPICAL MOISTURE IN OVER THE AREA. CURRENT FORECAST IS IN GOOD SHAPE WITH THESE FEATURES...AND TRENDS. NO UPDATES PLANNED AT THIS TIME. && .PREV DISCUSSION /300 PM MST/...DRIER SOUTHWEST FLOW HAS DEVELOPED ALONG/SOUTHWEST OF THE MOGOLLON RIM...DUE TO HIGH PRESSURE CENTERED TO OUR SOUTHEAST AND A WEST COAST TROUGH. ISOLATED TO SCATTERED STORMS HAVE DEVELOPED FROM SOUTHERN APACHE COUNTY...TO THE NORTH SIDE OF THE MOGOLLON RIM UP TO THE KAIBAB PLATEAU. EXPECT THESE TO CONTINUE DRIFTING TOWARD THE NORTHEAST THROUGH THE EVENING. A FEW BRIEFLY STRONG STORMS WITH HEAVY RAIN/SMALL HAIL WILL BE POSSIBLE IN THESE AREAS. BY FRIDAY...DEEPER MOISTURE POISED OVER SE AZ AND NORTHERN MEXICO IS FORECAST TO MOVE NORTHWARD AND BEGIN TO AFFECT THE SOUTHERN PORTIONS OF OUR FORECAST AREA BY THE AFTERNOON WITH AN INCREASING CHANCE OF STORMS COMPARED TO TODAY. ISOLATED TO SCATTERED STORMS ARE EXPECTED AGAIN ALONG/NORTH OF THE MOGOLLON RIM. OVER THE WEEKEND...THE WEST COAST TROUGH IS EXPECTED TO PUSH INLAND...INCREASING WIND FLOW ALOFT. MEANWHILE...DEEP SUBTROPICAL MOISTURE WILL PUSH NORTHWARD INTO AZ. THE COMBINATION OF STRONGER WINDS ALOFT AND INCREASED MOISTURE WILL RESULT IN A BETTER CHANCE OF THUNDERSTORMS...AND STRONGER MORE ORGANIZED THUNDERSTORM ACTIVITY. PRECIPITABLE WATER VALUES ARE ALSO FORECAST TO EXCEED 1 INCH OVER THE MTNS...WITH 1.25 INCH VALUES AT LOWER ELEVATIONS. STORMS ON SATURDAY WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL...THOUGH THIS THREAT IS SOMEWHAT REDUCED BY THE 10-15 MPH STORM MOTION. FOR SUNDAY... WE KEPT A 30-50 PERCENT CHANCE OF STORMS IN THE FORECAST...ALTHOUGH THE LATEST GFS INDICATES MUCH DRIER AIR SWEEPING INTO THE AREA FROM THE WEST AS THE TROUGH MOVES IN. OTHER MODELS AND GFS ENSEMBLES ARE SLOWER WITH THIS DRYING TREND. FOR MONDAY THROUGH MIDDLE OF NEXT WEEK...MODELS CONTINUE TO SHOW THE WEST COAST TROUGH PUSHING DRY SOUTHWEST FLOW ACROSS THE AREA. THE RESULT WOULD BE A DRAMATIC DECREASE IN DAILY THUNDERSTORM ACTIVITY. WE HAVE FURTHER REDUCED STORM CHANCES IN THE FORECAST DURING THIS PERIOD. && .AVIATION...FOR THE 06Z PACKAGE...ISOLD -TSRA CONTINUE OVER NORTHERN NAVAJO AND SOUTHERN APACHE COUNTIES. EXPECT ACTIVITY ENDING 05-07Z. MVFR AND LCL IFR CONDITIONS PSBL IN THE STRONGER STORMS. BY 17Z FRIDAY...ISOLD-SCT -TSRA WILL BEGIN TO REDEVELOP MAINLY ALONG AND NORTH OF THE MOGOLLON RIM. DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...................BAK AVIATION/FIRE WEATHER....BAK VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1001 AM MST THU AUG 5 2010 AZZ004>018-037>040-060500- KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY- COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS- NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY- CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS- NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS- OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA- NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264- 1001 AM MST THU AUG 5 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ARIZONA...NORTH CENTRAL ARIZONA...NORTHEAST ARIZONA AND WEST CENTRAL ARIZONA. .DAY ONE...TODAY AND TONIGHT EXPECT SCATTERED SHOWERS AND THUNDERSTORM TO DEVELOP LATE THIS MORNING AND AFTERNOON...MAINLY FROM THE MOGOLLON RIM NORTHWARD. THE STORMS WILL MOVE TOWARD THE NORTHEAST AT 10 TO 15 MPH. A FEW STORMS MAY PRODUCE LOCALLY HEAVY RAINFALL AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A SLIGHT INCREASE IN THUNDERSTORM ACTIVITY IS EXPECTED FRIDAY AFTERNOON AND EVENING AS MOISTURE INCREASES GRADUALLY FROM SOUTH TO NORTH. EXPECT A GREATER INCREASE IN THUNDERSTORMS SATURDAY THROUGH SUNDAY AS DEEP MONSOON MOISTURE RETURNS TO THE AREA. DRIER AIR WILL CAUSE ANOTHER DECREASE IN THUNDERSTORM ACTIVITY FOR THE BEGINNING OF NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Cedar City radar (KICX), 148 km away, was scanning. The volume nearest the first event began at 06:59 UTC.
1 flash flood. Local standard time, as filed.
The tour company at Antelope Canyon reported flash flooding in the canyon after midnight.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2010Every state in 2010This day in weather historyWarnings in Arizona, August 2010
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: 258441.