Thunderstorms caused flash flooding over Highway 260 near Camp Verde.
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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 caused flash flooding over Highway 260 near Camp Verde.
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 23, 3:30 PM MST, 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 330 PM MST MON JUL 23 2012 .SYNOPSIS...A MOIST AND UNSTABLE AIR MASS WILL CONTINUE TO BRING DAILY SHOWERS AND THUNDERSTORMS TO THE REGION THROUGH THE MIDDLE OF THE WEEK. DRIER AIR WILL MOVE OVER ARIZONA FROM THE WEST TUESDAY THROUGH THURSDAY FOR A SLIGHT DOWN TURN IN THUNDERSTORM ACTIVITY. && .DISCUSSION...SCATTERED THUNDERSTORMS DEVELOPED OVER NORTHERN ARIZONA TODAY. MOST OF THE STORMS HAVE BEEN OVER THE HIGHER TERRAIN. OTHER STORMS ARE EXPECTED TO DEVELOP OVER THE LOWER TERRAIN LATER THIS AFTERNOON AND EVENING WITH MORE SURFACE HEATING AND OUTFLOW BOUNDARIES INTERACT. THE HIGH PRESSURE THAT HAS BEEN EAST OF ARIZONA FOR THE PAST FEW DAYS WILL ELONGATE WESTWARD THIS WEEK. BY LATE TUESDAY AND WEDNESDAY...PART OF THE HIGH WILL SEPARATE AND MOVE WEST OF ARIZONA. THIS WILL ACT TO BRING DRIER AIR ALOFT OVER MUCH OF THE STATE. HOWEVER...LOW LEVELS WILL STILL REMAIN MOIST ENOUGH TO PRODUCE ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS EACH DAY. BY LATE IN THE WEEK...THE HIGH OVER THE GREAT BASIN MIGRATES EASTWARD INTO THE CENTRAL US AND ONCE AGAIN ALLOWS A SOUTHEASTERLY FLOW TO REDEVELOP ACROSS THE STATE WITH TROPICAL MOISTURE AGAIN INCREASING. && .AVIATION...FOR THE 00Z PACKAGE...EXPECT SCT TO NMRS -SHRA/-TSRA WITH ISOLD +TSRA THROUGH 02Z-04Z TUESDAY...ESPECIALLY ALONG AND WEST OF A LINE FROM KSJN-KFLG-KGCN. ISOLD CELLS ARE EXPECTED NORTH OF THIS LINE. ANY OF THE STRONGER STORMS MAY PRODUCE LOCALIZED MVFR/IFR CONDITIONS. EXPECT DECREASING ACTIVITY AFT 02Z-04Z TUES. CONDITIONS WILL IMPROVE TUESDAY AFTERNOON...WITH SCT -SHRA/-TSRA AFT 18Z-20Z MAINLY ALONG AND SOUTH OF THE MOGOLLON RIM. 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.........MAS AVIATION.......BEP FIRE WEATHER...BEP 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.
The Flagstaff radar (KFSX), 63 km away, was scanning. The volume nearest the first event began at 23:10 UTC.
1 flash flood. Local standard time, as filed.
Water was flowing over Highway 260 at milepost 218.
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: 405577.