Thunderstorms produced heavy rain over the Schultz Fire burned area and flash flooding in the in the neighborhood below.
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.
Thunderstorms produced heavy rain over the Schultz Fire burned area and flash flooding in the in the neighborhood below.
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 10, 9:00 PM MST, 5 hours 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 900 PM MST SAT SEP 10 2011 .SYNOPSIS...A LOW PRESSURE SYSTEM OVER THE SOUTHWESTERN STATES WILL BRING A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH THE MIDDLE OF NEXT WEEK. STORMS THIS WEEKEND MAY PRODUCE LOCALLY HEAVY RAIN AND HAIL. COOLER THAN NORMAL TEMPERATURES WILL CONTINUE. && .DISCUSSION...STORM ACTIVITY WAS ON THE INCREASE ACROSS PORTIONS OF YAVAPAI AND GILA COUNTIES DURING THE EVENING HOURS. ONE STORM 15 MILE EAST OF BLACK CANYON CITY LIKELY PRODUCED HAIL UP TO GOLF BALL SIZE. THE SOUNDING AT FLAGSTAFF INDICATED QUITE A BIT OF INSTABILITY ALREADY WITH FURTHER MOISTURE INCREASES EXPECTED OVER NIGHT. IN ADDITION...THE VERTICAL SHEAR WILL INCREASE THROUGH THE NIGHT. COULD BECOME QUITE ACTIVE FROM THE MOGOLLON RIM SOUTHWARD OVERNIGHT WITH ISOLATED SEVERE THUNDERSTORMS AND HAIL IN EXCESS OF AN INCH IN DIAMETER POSSIBLE. OTHERWISE...EXPECT THUNDERSTORM INTENSITY TO GENERALLY DECREASE OVER THE NORTHERN THIRD OF THE STATE LATER TONIGHT...WITH A BETTER CHANCE OF STORMS ALONG/SOUTH OF A LINE FROM SELIGMAN...TO FLAGSTAFF...TO WINDOW ROCK. DEEPER MOISTURE POISED OVER SONORA MEXICO AND SOUTHERN ARIZONA IS FORECAST TO BE PULLED NORTHWARD INTO ARIZONA TONIGHT INTO SUNDAY AS SOUTHERLY FLOW INCREASES AHEAD OF A LOW OVER CALIFORNIA. A MID-LEVEL WIND SPEED MAX IS ALSO FORECAST TO ROTATE INTO THE STATE LATE TONIGHT THROUGH SUNDAY. THE BEST COMBINATION OF WIND SHEAR AND INSTABILITY WITH THESE FEATURES IS EXPECTED ALONG AND WEST OF A LINE FROM PAGE TO SHOW LOW. SOME STORMS THAT DEVELOP IN THIS AREA TONIGHT THROUGH SUNDAY COULD BECOME STRONG OR SEVERE...WITH LARGE HAIL...STRONG GUSTY WINDS AND FLASH FLOODING POSSIBLE. MONDAY THROUGH WEDNESDAY...GOOD MODEL AGREEMENT THAT THE CLOSED LOW WILL MOVE SLOWLY TOWARD WESTERN ARIZONA DURING THIS TIME FRAME. MOISTURE WILL LINGER OVER ARIZONA AND SHOULD BE SUFFICIENT FOR A CHANCE OF SHOWERS AND THUNDERSTORMS EACH DAY. THURSDAY AND BEYOND...THE UPPER LOW WILL CROSS ARIZONA AND MOVE EASTWARD. PRECIP CHANCES ARE DECREASING THROUGH THIS PERIOD. && .AVIATION...FOR THE 06Z PACKAGE...MONSOON MOISTURE WILL INTERACT WITH A LOW PRESSURE SYSTEM CENTERED JUST OFF THE SOUTHERN CALIFORNIA COAST OVER THE NEXT 24 HOURS. EXPECT ISOLATED TO SCATTERED THUNDERSTORMS OVERNIGHT BECOMING MORE NUMEROUS DURING THE DAY SUNDAY. SOME STORMS COULD BECOME SEVERE PRODUCING HAIL OVER AN INCH IN DIAMETER AND WIND GUSTS IN EXCESS OF 45 KT. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC..................MCCOLLUM/JJ AVIATION................MCCOLLUM FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 249 PM MST SAT SEP 10 2011 AZZ004>018-037>040-110900- 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- 249 PM MST SAT SEP 10 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ARIZONA...NORTH CENTRAL ARIZONA...NORTHEAST ARIZONA AND WEST CENTRAL ARIZONA. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS THE NORTHLAND FROM THIS AFTERNOON THROUGH THE NIGHT. A FEW OF THE STORMS MAY BECOME SEVERE... WITH HAIL UP TO ONE INCH IN DIAMETER AND STRONG GUSTY WINDS. LOCALIZED FLASH FLOODING IS ALSO POSSIBLE WITH SOME OF THE STORMS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED OVER NORTHERN ARIZONA ON SUNDAY. SOME OF THE STORMS MAY BECOME SEVERE. ONE INCH DIAMETER HAIL...STRONG GUSTY WINDS AND FLASH FLOODING WILL BE POSSIBLE WITH THE STRONGER STORMS. STORMS WILL PERSIST FROM MONDAY THROUGH AT LEAST WEDNESDAY...THOUGH THE RISK OF SEVERE WEATHER WILL DECREASE. SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
936 PM MST SAT SEP 10 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0920 PM HAIL CORDES JUCNTION 34.33N 112.12W
09/10/2011 E0.88 INCH YAVAPAI AZ PUBLIC
&&
EVENT NUMBER FGZ1100242
RBSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1147 PM MST SAT SEP 10 2011 AZZ006-007-110745- COCONINO AZ- 1147 PM MST SAT SEP 10 2011 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA UNTIL 1245 AM MST AT 1135 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED THAT A THUNDERSTORM WAS DEVELOPING 16 MILES NORTH OF ASH FORK...MOVING NORTHEAST AT 20 MPH. THIS STORM WILL MOVE INTO TUSAYAN BY MIDNIGHT AND ACROSS THE SOUTH RIM OF THE GRAND CANYON BY 1215 AM. THIS STORM HAS FREQUENT CLOUD TO GROUND LIGHTNING...33 CLOUD TO GROUND STROKES IN 5 MINUTES HAVE BEEN MEASURED. WIND GUSTS TO 40 MPH AND SMALL HAIL ARE PROBABLE ALONG WITH HEAVY RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 3618 11229 3605 11202 3536 11244 3543 11264 TIME...MOT...LOC 0642Z 205DEG 16KT 3548 11249 41
The Flagstaff radar (KFSX), 91 km away, was scanning. The volume nearest the first event began at 09:27 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain caused flash flooding and debris to flow across roads in Hutchinson Acres and Timberline Estates. Damage to private roads and driveways was also reported. Several roads were impassible.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2011Every state in 2011This day in weather historyWarnings in Arizona, September 2011
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: 348573.