Heavy rain fell across the Grand Canyon from the Grand Canyon Village to Supai Village during the overnight hours.
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 FGZ wrote it up.
Heavy rain fell across the Grand Canyon from the Grand Canyon Village to Supai Village during the overnight hours.
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 24, 2:30 AM MST, 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 AM MST TUE JUL 24 2012 .SYNOPSIS...A MOIST AND UNSTABLE AIR MASS WILL CONTINUE TO BRING SCATTERED SHOWERS AND THUNDERSTORMS TODAY. FOR WEDNESDAY AND THURSDAY...A DRIER AND MORE STABLE AIR MASS WILL MOVE IN FROM OVER THE EASTERN PACIFIC WITH A DOWNTURN IN THUNDERSTORMS ACTIVITY. BY FRIDAY...MOIST SOUTHERLY FLOW WILL RETURN WITH MONSOON ACTIVITY RAMPING-UP HEADING INTO THE WEEKEND. && .DISCUSSION...SHOWERS AND THUNDERSTORMS OVER NORTH CENTRAL ARIZONA WILL GENERALLY DECREASE IN NUMBER TOWARD SUNRISE BUT NOT END COMPLETELY. ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO LAST THROUGH THE MORNING HOURS AS A WEAK DISTURBANCE ALOFT MOVES ACROSS NORTHERN ARIZONA. THE TOUGH CALL FOR TODAY IS HOW MUCH SHOWER AND STORM ACTIVITY WILL THERE BE FROM ABOUT FLAGSTAFF WESTWARD. HIGH PRESSURE FROM THE EASTERN PACIFIC WILL BEGIN TO MOVE OVER THE AREA AND THIS WILL BE ACCOMPANIED BY WARMER AIR ALOFT. BETWEEN A SOMEWHAT COOL BOUNDARY LAYER...SOME CLOUDS AND A DEVELOPING WARM CAP ALOFT COULD SEE SUPPRESSED ACTIVITY. EAST OF FLAGSTAFF AND TOWARD THE NEW MEXICO BORDER IT SHOULD REMAIN ACTIVE WITH DEEP MOISTURE...NO CAP AND THE WEAK DISTURBANCE MOVING ACROSS THE AREA. FOR WEDNESDAY AND THURSDAY...THE EASTERN PACIFIC HIGH WILL BRING WARMER AIR ALOFT AND SOME DRYING TO NORTHERN ARIZONA. EXPECT A GENERAL DOWNTURN IN THUNDERSTORM ACTIVITY AS A MORE STABLE AIR MASS DOMINATES. MUCH OF THE AREA WILL ONLY SEE A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. AFTERNOON THUNDERSTORMS ARE EXPECTED TO CONTINUE ALONG THE NEW MEXICO BORDER AND OVER THE WHITE MOUNTAINS. FOR FRIDAY AND THE WEEKEND...MODELS ARE PROMISING A RETURN TO SOUTHEASTERLY FLOW AND MONSOON MOISTURE WITH THE CHANCE OF SHOWERS AND THUNDERSTORMS ON THE INCREASE ACROSS NORTHERN ARIZONA. && .AVIATION...FOR THE 12Z PACKAGE...EARLY MORNING THUNDERSTORM ACTIVITY NEAR NORTHERN AZ TAF SITES SHOULD DECREASE BY 14-15Z. ANOTHER ROUND OF TSRA IS EXPECTED TO DEVELOP BY 18-19Z...MAINLY FROM KGCN-KFLG EASTWARD. MVFR/IFR CONDITIONS WILL BE POSSIBLE. THUNDERSTORM COVERAGE SHOULD DECREASE AGAIN BY 02-03Z. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FIRE WEATHER...A SLOW DRYING TREND WILL DEVELOP TUESDAY AND WEDNESDAY WITH STORMS ACTIVITY DECREASING FROM THE WEST AND NORTH. AREAS ALONG AND SOUTH OF THE MOGOLLON RIM WILL REMAIN RELATIVELY MOIST AND ACTIVE. THURSDAY THROUGH SATURDAY...THE DRYING TREND WILL PERSIST INTO THURSDAY...BEFORE SOUTHERLY FLOW BRINGS SCATTERED AFTERNOON AND EVENING SHOWER AND THUNDERSTORM ACTIVITY BACK NORTH AND WEST OVER THE WEEKEND. WINDS WILL BE LIGHT THROUGH THE PERIOD WITH MINIMUM RELATIVE HUMIDITY VALUES RANGING FROM 20 TO 35 PERCENT. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.........MCCOLLUM AVIATION.......AT FIRE WEATHER...AT FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 500 AM MST MON JUL 23 2012 AZZ004>018-037>040-240700- WESTERN MOGOLLON RIM-GRAND CANYON COUNTRY-YAVAPAI COUNTY MOUNTAINS- YAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONS- MARBLE AND GLEN CANYONS-KAIBAB PLATEAU-COCONINO PLATEAU- NORTHEAST PLATEAU AND MESAS HWY 264 NORTHWARD- NORTHEAST PLATEAU AND MESAS SOUTH OF HWY 264- CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- BLACK MESA AREA-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- EASTERN MOGOLLON RIM-WHITE MOUNTAINS-NORTHERN GILA COUNTY- 500 AM MST MON JUL 23 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY A MOIST AND UNSTABLE AIR MASS ACROSS THE REGION WILL BRING A CONTINUATION OF SHOWERS AND THUNDERSTORMS TO THE REGION TODAY. SOME OF THE STRONGER STORMS MAY PRODUCE SMALL HAIL...STRONG GUSTY WINDS... AND THE POTENTIAL FOR LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY EXPECT AN ACTIVE PATTERN WITH SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS THROUGH MID WEEK...THEN A SLIGHT DECREASE IN ACTIVITY IS POSSIBLE FOR THE LATTER HALF OF THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 945 PM MST MON JUL 23 2012 AZZ018-240530- GILA AZ- 945 PM MST MON JUL 23 2012 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... NORTHWESTERN GILA COUNTY IN EAST CENTRAL ARIZONA UNTIL 1030 PM MST AT 935 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED STRONG THUNDERSTORMS FROM PAYSON TO STAR VALLEY...MOVING NORTHEAST AT 15 MPH. THESE STORMS ARE PRODUCING VERY HEAVY RAINFALL...SMALL HAIL AND GUSTY WINDS. LOCATIONS IMPACTED INCLUDE... PAYSON... STAR VALLEY... BEAVER VALLEY... WHISPERING PINES... TONTO VILLAGE... KOHLS RANCH... PRECAUTIONARY/PREPAREDNESS ACTIONS... VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME ROADS AND MINOR FLOODING OF POOR DRAINAGE AREAS. IN HEAVY RAINFALL SLOW DOWN TO REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE DISTANCE BETWEEN YOURSELF AND OTHER VEHICLES. && LAT...LON 3441 11130 3432 11105 3408 11128 3417 11153 TIME...MOT...LOC 0442Z 218DEG 13KT 3425 11132 JJ
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1009 PM MST MON JUL 23 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1000 PM HEAVY RAIN PAYSON 34.24N 111.33W
07/23/2012 M1.03 INCH GILA AZ LAW ENFORCEMENT
FLOODING EVERYWHERE IN TOWN...WORST ON FOREST DRIVE
&&
EVENT NUMBER FGZ1200066
DGVPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1010 PM MST MON JUL 23 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1000 PM HEAVY RAIN PAYSON 34.24N 111.33W
07/23/2012 M1.03 INCH GILA AZ LAW ENFORCEMENT
FLOODING EVERYWHERE IN TOWN...WORST ON FOREST DRIVE
WITH TWO FEET OF WATER OVER ROAD
&&
CORRECTED REMARKS
EVENT NUMBER FGZ1200066
DGVPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1015 PM MST MON JUL 23 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1014 PM HEAVY RAIN PAYSON 34.24N 111.33W
07/23/2012 M1.32 INCH GILA AZ TRAINED SPOTTER
RAINFALL DURATION ONE HOUR
&&
EVENT NUMBER FGZ1200067
DGVThe Flagstaff radar (KFSX), 182 km away, was scanning. The volume nearest the first event began at 09:59 UTC.
1 heavy rain, 1 flash flood. Local standard time, as filed.
Between 1.22 and 2.50 inches of rain fell across the South Rim of the Grand Canyon westward to Supai Village in 5 to 8 hours. Rockslides were reported on Bright Angel Trail.
Supai Village Police reported a 3 to 4 foot rise in Havasu Creek near Supai Village. The campground was evacuated. The trail bridges were compromised and the people on the west side of Havasu Creek were stranded.
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: 405580, 405581.