Thunderstorms with heavy rain temporarily closed Highway 160 southwest of Tuba City.
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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 with heavy rain temporarily closed Highway 160 southwest of Tuba City.
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 Sep 11, 10:00 AM MST, 4 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1000 AM MST TUE SEP 11 2012 .SYNOPSIS... A MOIST STORM SYSTEM WILL MOVE ACROSS NORTHERN ARIZONA THROUGH WEDNESDAY SPREADING SHOWERS AND THUNDERSTORMS ACROSS THE AREA. BEHIND THIS SYSTEM...DRIER AIR WILL MOVE IN FOR THE END OF WEEK WITH ONLY A SLIGHT CHANCE OF THUNDERSTORMS. && .DISCUSSION... VERY MOIST CONDITIONS PERSIST ACROSS THE REGION WITH PRECIPITABLE WATER VALUES ABOVE NORMAL FOR THIS TIME OF YEAR. A TROUGH IS MOVING EASTWARD THROUGH CENTRAL CALIFORNIA INTO NEVADA THIS MORNING...WHICH SHOULD FINALLY GET THE WEAK LOW OVER NRN BAJA TO EJECT THROUGH SOUTHERN AZ TODAY. EXTENSIVE CLOUD COVER ALSO EXISTS THIS MORNING WHICH MAY PERSIST FOR MUCH OF THE DAY. THIS SHOULD ACT TO KEEP MOST SHOWER AND THUNDERSTORM ACTIVITY FROM BEING TOO STRONG OUTSIDE OF THE AREAS OF LARGER SCALE LIFT. THE MOST FAVORABLE AREAS FOR SIGNIFICANT STORM ACTIVITY APPEAR TO BE NW COCONINO AND WRN YAVAPAI COUNTY WITH THE APPROACHING TROUGH...AND POSSIBLY GILA COUNTY TOWARD THE WHITE MTNS ASSOCIATED WITH THE EJECTING BAJA LOW. THE MAIN THREATS WILL BE HEAVY RAIN AND LOCALIZED FLOODING. SHOWERS AND THUNDERSTORMS WILL LIKELY CONTINUE OVERNIGHT AS THE MAIN TROUGH PASSES THROUGH. SOME MINOR UPDATES WERE SENT A SHORT TIME AGO...GENERALLY TO ADD HEAVY RAINFALL TO NW AZ...AND TO INCREASE STORM CHANCES FOR THE OVERNIGHT PERIOD. A CHANCE OF SHOWERS AND STORMS CONTINUES FOR WEDNESDAY MAINLY FROM THE MOGOLLON RIM NORTHWARD. DRIER AIR IS THEN FORECAST TO RETURN FOR THE LATTER STAGES OF THE WEEK...THOUGH SLIGHT CHANCES FOR PRECIP (GENERALLY BELOW 15 PERCENT) WILL CONTINUE. && .AVIATION... FOR THE 18Z PACKAGE...EXPECT SCATTERED TO NUMEROUS -SHRA/TSRA AND ISOLATED +TSRA. SCATTERED MVFR/IFR WITH ISOLATED LIFR CONDITIONS WILL OCCUR THROUGH 02Z-04Z WEDNESDAY. OVERNIGHT WEATHER CONDITIONS WILL BE MAINLY VFR WITH BRIEF MVFR/IFR POSSIBLE IN HEAVIER SHOWERS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.........JJ AVIATION.......BOHLIN FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 940 AM MST TUE SEP 11 2012 AZZ004>018-037>040-120700- 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- 940 AM MST TUE SEP 11 2012 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 SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY AND TONIGHT. LOCALIZED HEAVY RAIN IS ANTICIPATED TO BE THE PRIMARY THREAT FROM LATE THIS MORNING AND INTO OVERNIGHT AS A MOIST DISTURBANCE MOVES ACROSS THE NORTHLAND. THE HIGHEST RISK OF HEAVY RAIN AT THIS TIME APPEARS TO BE ACROSS NORTHWEST COCONINO AND WESTERN YAVAPAI COUNTIES ASSOCIATED WITH THE APPROACHING TROUGH. ELSEWHERE...EXTENSIVE CLOUD COVER MAY LIMIT INSTABILITY...WITH A LOWER RISK OF HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SHOWERS AND THUNDERSTORMS ARE EXPECTED TO PERSIST INTO WEDNESDAY AS MOISTURE PUSHES ACROSS THE STATE. DRIER AIR AND LESS PRECIPITATION ARE PREDICTED 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 national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Tuba City Police reported minor flooding from heavy rain in the Kerley Valley. Water covered Highway160 and caused a temporary road closure.
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, September 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: 413059.