A thunderstorm produced a brief tornado near Holbook.
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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.
A thunderstorm produced a brief tornado near Holbook.
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 1, 9:30 AM MST, 3 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST THU SEP 1 2011 .SYNOPSIS...HIGH PRESSURE WILL BE CENTERED OVER NEW MEXICO THROUGH EARLY NEXT WEEK...THEREFORE ABOVE NORMAL HIGH TEMPERATURES WILL CONTINUE ACROSS NORTHERN ARIZONA. ENOUGH MOISTURE WILL REMAIN ACROSS THE EASTERN HALF OF THE STATE FOR A CHANCE OF AFTERNOON THUNDERSTORMS EACH DAY. HOWEVER...DRIER AIR WILL AFFECT WESTERN ARIZONA...WITH ONLY A SLIGHT CHANCE OF THUNDERSTORMS. && .DISCUSSION...AN EAST-WEST ORIENTED RIDGE LOCATED FROM THE SOUTHERN PLAINS INTO SE ARIZONA WILL CONTINUE TO AFFECT ARIZONA THROUGH FRIDAY WHEN HIGH PRESSURE WILL CENTER OVER NEW MEXICO. IN ADDITION...A STRONG MOISTURE GRADIENT WILL CONTINUE TO AFFECT OUR REGION...WITH SATELLITE ESTIMATED PRECIPITABLE WATER NEAR A QUARTER INCH ACROSS NW AZ...INCREASING TO NEAR 0.9 INCH ACROSS EAST CENTRAL AZ. THIS WILL RESULT IN ONLY A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS OVER WESTERN ARIZONA TODAY...INCREASING TO CHANCE IN EASTERN ARIZONA. THE BEST CHANCES OF PRECIPITATION WILL BE OVER THE WHITE MOUNTAINS. THE CURRENT FORECAST PACKAGES LOOKS GOOD AN NO UPDATES ARE NEEDED. && .PREVIOUS DISCUSSION/330 AM MST/...AN EAST-WEST ORIENTED RIDGE WAS LOCATED FROM THE SOUTHERN PLAINS INTO SE ARIZONA THIS MORNING. THE WESTERN U.S. TROUGH THAT HELPED BRING GUSTY WINDS TO NW AZ WEDNESDAY WAS BEGINNING TO SHIFT EASTWARD SO THAT WINDS TODAY SHOULD BE SOMEWHAT LIGHTER. A STRONG MOISTURE GRADIENT IS AFFECTING OUR REGION THIS MORNING...WITH SATELLITE ESTIMATED PRECIPITABLE WATER NEAR A QUARTER INCH ACROSS NW AZ...INCREASING TO NEAR 0.9 INCH ACROSS EAST CENTRAL AZ. AS THE RIDGE AXIS SHIFTS NORTHWARD THE NEXT FEW DAYS...EXPECT THIS MOISTURE BOUNDARY TO SHIFT SLIGHTLY WESTWARD...BRINGING A CHANCE OF AFTERNOON STORMS BACK TO THE FLAGSTAFF...PRESCOTT AND GRAND CANYON AREAS. THE BEST CHANCES HOWEVER WILL CONTINUE TO BE OVER THE EASTERN PORTIONS OF THE STATE. OVERALL MOISTURE LEVELS ARE NOT TOO IMPRESSIVE...WITH ANY AREAS OF HEAVY RAIN OVER EASTERN AZ REMAINING LOCALIZED. FROM MONDAY THROUGH WEDNESDAY...THE RIDGE IS FORECAST TO MOVE BACK TOWARD SE AZ AS A TROUGH MOVES ONTO THE WEST COAST. SOME ADDITIONAL MOISTURE MAY BE DRAWN NORTHWARD INTO OUR REGION AS THIS OCCURS...SO THE CHANCE OF AFTERNOON STORMS REMAINS IN THE FORECAST. && .AVIATION...FOR THE 18Z PACKAGE...EXPECT SCATTERED SHOWERS AND THUNDERSTORMS MAINLY ALONG AND EAST OF A LINE FROM KPAN TO KINW TO K0V7 (KAYENTA) THROUGH THIS AFTERNOON. ONLY ISOLATED ACTIVITY WILL BE OBSERVED WEST OF THIS LINE. SOUTHWEST SURFACE WINDS WINDS OF 10-20 KT WILL ALSO DEVELOP AFTER 19Z...ESPECIALLY OVER THE HIGHER TERRAIN FROM KFLG WESTWARD. MVFR CIGS AND GUSTY WINDS ARE POSSIBLE WITH ANY OF THE STRONGER STORMS. STORM ACTIVITY WILL DIMINISH SIGNIFICANTLY AFTER 01Z-03Z FRIDAY. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...........JVC/JJ AVIATION.........KD FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 419 AM MST THU SEP 1 2011 AZZ004>018-037>040-020330- 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- 419 AM MST THU SEP 1 2011 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 SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS AFTERNOON EAST OF A LINE FROM PAYSON...TO FLAGSTAFF...TO KAYENTA. DRY AIR WEST OF THIS LINE WILL RESULT IN LITTLE OR NO THUNDERSTORM ACTIVITY. VERY HOT CONDITIONS WILL ALSO CONTINUE OVER LOW DESERT AREAS OF CENTRAL ARIZONA...AND ALSO IN THE GRAND CANYON. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY EXPECT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS EACH DAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Flagstaff radar (KFSX), 104 km away, was scanning. The volume nearest the first event began at 20:25 UTC.
1 tornado. Local standard time, as filed.
A tornado briefly touched down 1 mile east of milepost 384 on State Route 77.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2011Every state in 2011This day in weather historyThe tornado archive for Arizona, 2011Warnings 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: 348479.