A thunderstorm produced heavy rain and street flooding near Prescott Valley.
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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 heavy rain and street flooding near Prescott Valley.
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 5, 10:02 AM MST, 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1002 AM MST MON SEP 5 2011 .SYNOPSIS...A WEAK LOW PRESSURE SYSTEM WILL BRUSH ARIZONA ON MONDAY AND TUESDAY. AS A RESULT...LOOK FOR MORE WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY ALONG WITH SLIGHTLY COOLER TEMPERATURES. THE REMAINDER OF THE COMING WORK WEEK WILL SEE A CHANCE FOR DAILY SHOWERS AND STORMS ALONG WITH NEAR NORMAL TEMPERATURES. && .DISCUSSION...SKIES ARE CONTINUING TO CLEAR OUT ACROSS EASTERN ARIZONA TODAY...ALLOWING FOR MORE DAYTIME HEATING AND AFTERNOON SHOWERS AND THUNDERSTORMS. IN ADDITION SURFACE DEW POINTS HAVE INCREASED SIGNIFICANTLY IN THE LAST 12 HOURS...WITH VALUES 10-15 DEGREES HIGHER THAN YESTERDAY MORNING. SHOWER AND THUNDERSTORM ACTIVITY SHOULD START BY 1100 AM MST ACROSS EASTERN ARIZONA...SPREADING WESTWARD ALONG THE RIM THROUGH THE DAY. STORMS WILL GENERALLY MOVE IN AN EASTERLY DIRECTION. THE CURRENT FORECAST PACKAGE LOOKS GOOD AND NO UPDATES ARE NEEDED. && .PREVIOUS DISCUSSION/330 AM MST/...HIGH PRESSURE IN THE MID-LEVELS WAS CENTERED OVER THE SOUTHEAST CORNER OF ARIZONA EARLY THIS MORNING WITH A WEAK TROUGH OVER THE CALIFORNIA COAST. OVER THE NEXT 24-36 HOURS THE LOW WILL MOVE INLAND...BRUSHING ARIZONA. AT 3 AM THIS MORNING...THE LOW LEVELS OF THE ATMOSPHERE REMAINED DRY OVER THE NW HALF OF THE STATE...THOUGH THIS SHOULD RAPIDLY CHANGE LATER TODAY AND TONIGHT AS DEEP SOUTHERLY FLOW BECOMES ESTABLISHED ACROSS ARIZONA. THIS FLOW PATTERN WILL PULL THE MUCH MORE MOIST AIR POISED OVER SOUTHERN AZ ACROSS THE NORTHLAND...LEADING TO A DESTABILIZATION OF THE AIR MASS BY THIS AFTERNOON. EXPECT A FAIRLY DRAMATIC INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY. TONIGHT AND TUESDAY...AS THE WEAK LOW BRUSHES ARIZONA...LARGE-SCALE UPWARD MOTION WILL DEVELOP ACROSS THE NORTHWEST HALF OF ARIZONA UNDER THE RIGHT-REAR QUADRANT OF A JET MAX ALOFT. AS A RESULT...THE CHANCE FOR SHOWERS AND THUNDERSTORMS WILL CONTINUE TONIGHT INTO TUESDAY ACROSS A WIDE AREA. BY WEDNESDAY...AS THE LOW HEADS EASTWARD AND DRIER AIR MOVES IN FROM THE NORTH... EXPECT THE BEST CHANCE OF SHOWERS AND THUNDERSTORMS TO SHIFT SOUTH OVER THE WHITE MTNS AND EASTERN MOGOLLON RIM. DRIER NORTHEAST WINDS AND SEASONABLE TEMPERATURES EXPECTED ELSEWHERE. THURSDAY INTO THE WEEKEND...ANOTHER WEAK TROUGH IS FORECAST TO DEVELOP OVER CALIFORNIA AND REMAIN FAIRLY STATIONARY. ENOUGH MOISTURE SHOULD BE DRAWN BACK NORTHWARD OVER OUR REGION FOR THE CHANCE OF SHOWERS AND THUNDERSTORMS TO CONTINUE EACH DAY. IN ADDITION...COOLER MID-LEVEL TEMPERATURES ASSOCIATED WITH THIS TROUGH WILL ADD TO THE INSTABILITY. && .AVIATION...FOR THE 18Z PACKAGE...EXPECT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ACROSS NORTHERN ARIZONA TODAY. MVFR/LCL IFR CONDITIONS WITH ERRATIC GUSTY WINDS ARE POSSIBLE IN THE STRONGER STORMS. SHOWER ACTIVITY IS FORECAST TO CONTINUE INTO THE LATE EVENING HOURS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC..................JVC/JJ AVIATION/FIRE WEATHER...RB FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 356 AM MST MON SEP 5 2011 AZZ004>018-037>040-060700- 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- 356 AM MST MON SEP 5 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 EXPECT AN INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY TODAY AND TONIGHT AS MOISTURE IS DRAWN NORTHWARD AHEAD OF A WEAK TROUGH. THE MAIN THREATS WILL BE LOCALLY HEAVY RAIN AND GUSTY WINDS. PEOPLE NEAR THE RECENT BURN AREAS INCLUDING THE SCHULTZ...LOCUST AND WALLOW...SHOULD REMAIN ALERT FOR THE POSSIBILITY OF FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SCATTERED THUNDERSTORMS ARE EXPECTED OVER MUCH OF NORTHERN ARIZONA TUESDAY...WITH LOCALLY HEAVY RAIN THE MAIN THREAT. DRIER AIR WILL FILTER IN FROM THE NORTH ON WEDNESDAY...KEEPING THE BEST CHANCE OF STORMS OVER EAST-CENTRAL ARIZONA. THE CHANCE OF THUNDERSTORMS WILL RETURN TO ALL OF NORTHERN ARIZONA THURSDAY INTO THE WEEKEND. .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.
2 heavy rain. Local standard time, as filed.
Heavy rain (1.35) and hail up to 1/2 inch was reported 1 mile east of Highway 89 in Chino Valley.
Heavy rain exceeding rates of 2 inches an hour, produced heavy local street flooding 2 miles north of Prescott Valley.
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: 348483, 348482.