Thunderstorms produced heavy rain and flash flooding in the Grand Canyon National Park and on the Havasupai Nation.
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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.
Thunderstorms produced heavy rain and flash flooding in the Grand Canyon National Park and on the Havasupai Nation.
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 Jul 28, 10:22 AM MST, 2 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1022 AM MST SUN JUL 28 2013 .SYNOPSIS...MONSOON MOISTURE WILL CONTINUE TO BRING A GOOD CHANCE OF THUNDERSTORMS TODAY...A FEW CAPABLE OF PRODUCING HEAVY RAIN. STARTING MONDAY...DRIER AIR WILL MOVE INTO NORTHERN ARIZONA WITH A DECREASE IN STORM ACTIVITY. && .DISCUSSION...A WEAK SHORTWAVE OVER SOUTHERN NEVADA IS EVIDENT ON WATER VAPOR/IR AND APPEARS TO BE SHEARING (PULLING APART) AS IT MOVES NORTHEAST ACROSS NORTHWEST ARIZONA. EVIDENCE OF LIFT ASSOCIATED WITH THIS FEATURE IS THE RADAR ECHOES EXTENDING FROM NAVAJO NATIONAL MONUMENT SOUTHWEST TO AROUND KINGMAN. THIS LIFT WILL DRIFT INTO CENTRAL COCONINO COUNTY AND JUST SOUTH OF THE BLACK MESA BY THIS AFTERNOON AND IT WILL HAVE WEAKENED CONSIDERABLY AND MAY NOT SUPPORT ENOUGH LIFT TO HAVE ANY DISCERNIBLE INFLUENCE AFTER THAT POINT ON TODAY'S WX. NEXT FEATURE TO AFFECT WESTERN ARIZONA IS AN UPPER LEVEL SHORTWAVE SEEN IN THE MODEL DATA AT 300 MB. THIS FEATURE WILL TRACK NNW ACROSS WESTERN ARIZONA AND INTO NW COCONINO COUNTY. THIS FEATURE WILL PROVIDE LIFT IN ASSOCIATION WITH UPPER LEVEL VORTICITY ADVECTION. THE SHEAR OVER ARIZONA TODAY IS IN RESPONSE TO THE INCREASED HEIGHT GRADIENT OVER THE SOUTHWEST U.S. AS THE SOUTHWEST SITS BETWEEN A HIGH TO THE EAST AND A TROUGH OF LOW PRESSURE ALONG THE CALIFORNIA COAST. THE BEST SHEAR IS AT ANVIL LEVEL WHICH WILL HELP SUPPORT A FEW ORGANIZED THUNDERSTORMS MAYBE STRONG ENOUGH TO PRODUCE LARGE HAIL ALONG AND NORTHWEST OF A KPRC TO KRQE LINE. THE BEST PW IN THE FORECAST AREA IS ALONG AND NORTH OF THE I-40 CORRIDOR LATE THIS MORNING AND AFTERNOON. THERE IS THE POSSIBILITY OF MAYBE A FEW TRAINING STORMS IN THE SHEARED ENVIRONMENT THAT MAY POSE A HEAVY RAIN THREAT. STORMS WILL BE MOVING TO THE NORTHEAST TODAY BETWEEN 10 TO 20 KTS AND GIVEN THE RAPID MOVEMENT OF CELLS AND THE LOWER PW ENVIRONMENT WOULD NOT MAKE IT FAVORABLE FOR NUMEROUS AREA OF HEAVY RAIN AND OR FLASH FLOODING...EXCEPT FOR NW COCONINO COUNTY WHERE THE WEAK SYNOPTIC LIFT COULD FAVOR AN ENVIRONMENT FOR NUMEROUS THUNDERSTORM AND WITH THE UNIDIRECTIONAL SHEAR AN ANCHORED LINE OF STORMS WITH TRAINING CELLS. && .PREVIOUS DISCUSSION /300 AM MST/...MONSOON MOISTURE WILL REMAIN ACROSS NORTHERN ARIZONA TODAY. STRENGTHENING WESTERLY FLOW WILL BRING DRIER AIR TO THE AREA OVER THE NEXT 24 HOURS BUT THIS WILL BE A GRADUAL PROCESS. MORE THAN ENOUGH MOISTURE WILL REMAIN FOR HEAVY RAIN PRODUCING STORMS. STORM MOTION WILL GENERALLY BE FROM WEST TO EAST. THE STRENGTHENING FLOW ALOFT INCREASES THE POSSIBILITY OF TRAINING OF THUNDERSTORM CELLS AND THE THREAT FOR LOCALIZED FLASH FLOODING WILL CONTINUE. FOR MONDAY THROUGH WEDNESDAY...A WEAK LOW PRESSURE SYSTEM WILL BRUSH THE PACIFIC NORTHWEST MOVING FROM WEST TO EAST. IN RESPONSE...HIGH PRESSURE WILL BE SUPPRESSED TO THE SOUTH AND EAST OF ARIZONA. THE SHIFT IN THE HIGH WILL ALLOW A SLIGHTLY DRIER AND MORE STABLE AIR MASS FROM OVER THE EASTERN PACIFIC TO MOVE ACROSS NORTHERN ARIZONA. AS A RESULT...SHOWERS AND STORMS WILL BECOME MORE ISOLATED. FROM THURSDAY AND INTO NEXT WEEKEND...THE BREAK IN THE MONSOON LOOKS SHORT LIVED. AS THE PACIFIC NORTHWEST LOW PRESSURE SYSTEM HEADS EASTWARD MODELS CONTINUE TO SHOW HIGH PRESSURE MOVING BACK TOWARD THE FOUR CORNERS REGION. THE DOOR WOULD LIKELY THEN OPEN TO SOUTHERLY FLOW AND THE RETURN OF DEEP MONSOON MOISTURE. && .AVIATION...FOR THE 18Z PACKAGE...SCT-NMRS TSRA/SHRA WITH MVFR/IFR CONDITIONS. OVER NW AZ...SOME STORMS MAY PRODUCE LARGE HAIL AND STRONG WINDS. CONVECTIVE ACTIVITY SLOWLY DIMINISHING OVERNIGHT. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FIRE WEATHER...A MOIST AND UNSTABLE AIR MASS WILL REMAIN OVER NORTHERN ARIZONA TODAY PRODUCING AFTERNOON HEAVY RAIN SHOWERS AND THUNDERSTORMS. THE MAIN THREATS TO OPERATIONS WILL BE FROM LOCALIZED FLASH FLOODING AND LIGHTNING. DECREASING MOISTURE LEVELS ARE FORECAST STARTING ON MONDAY WITH LOWER CHANCES FOR STORM ACTIVITY. TUESDAY THROUGH THURSDAY...A DOWNWARD TREND IN THUNDERSTORM ACTIVITY WILL CONTINUE THROUGH WEDNESDAY. EXPECT INCREASING CHANCES FOR THUNDERSTORMS OVER NORTHEASTERN ARIZONA ON THURSDAY. && .FGZ WATCHES/WARNINGS/ADVISORIES...FLASH FLOOD WATCH UNTIL 10 PM MST THIS EVENING FOR AZZ004>007.. && PUBLIC.........TC/MCCOLLUM AVIATION.......DB FIRE WEATHER...BOHLIN FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 335 AM MST SUN JUL 28 2013 AZZ004>018-037>040-290745- 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- 335 AM MST SUN JUL 28 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY AND TONIGHT MONSOON MOISTURE WILL REMAIN OVER NORTHERN ARIZONA. STORMS WILL BE MOST NUMEROUS FROM THE MOGOLLON RIM NORTHWARD. THE MAIN THREAT FROM STORMS WILL CONTINUE TO BE HEAVY RAIN. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY FROM MONDAY THROUGH WEDNESDAY...DRIER AIR WILL MOVE OVER THE AREA WITH THUNDERSTORM AND SHOWER ACTIVITY BECOMING ISOLATED. FOR THURSDAY AND THE END OF THE WEEK...SOUTHERLY FLOW AND MONSOON MOISTURE WILL RETURN TO NORTHERN ARIZONA. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Cedar City radar (KICX), 153 km away, was scanning. The volume nearest the first event began at 19:20 UTC.
3 flash flood. Local standard time, as filed.
Flash flooding caused Havasu Creek to rise 5 feet through the Village of Supai. Minor damage was reported.
Thunderstorms produced flooding in Garden Creek along the popular Bright Angel Trail. The depth of the flood waters through Indian Gardens was 3 to 5 feet deep. The first flash flood on Garden Creek was reported at 1238 PM MST.
Other thunderstorms caused a second flash flood on Garden Creek at 342 PM MST.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2013Every state in 2013This day in weather historyWarnings in Arizona, July 2013
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: 474280, 474279, 474282.