Thunderstorms produced heavy rain in Tonto Village in northern Gila County.
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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 produced heavy rain in Tonto Village in northern Gila County.
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 Aug 1, 9:45 AM MST, 3 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 945 AM MST MON AUG 1 2011 .SYNOPSIS...MONSOON MOISTURE WILL PERSIST ACROSS ARIZONA THROUGH WEDNESDAY. EXPECT SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS...WITH SOME STORMS PRODUCING HEAVY RAINFALL. A DRYING TREND SHOULD START THURSDAY...WITH THE CHANCE OF STORMS LIMITED TO EASTERN ARIZONA THROUGH AT LEAST FRIDAY. MOISTURE LEVELS MAY TREND UPWARD THIS WEEKEND. && .DISCUSSION...EXPECTING A FAIRLY ACTIVE DAY TODAY...WITH SCATTERED TO NUMEROUS THUNDERSTORMS. THE 12Z SOUNDING AT BELLEMONT SHOWED AROUND AN INCH OF PRECIPITABLE WATER...WITH SOME LOW LEVEL MOISTENING AND MID LEVEL DRYING SINCE YESTERDAY MORNING. WITH THE ADDED LOW LEVEL MOISTURE...TODAY IS LOOKING A BIT MORE UNSTABLE THAN YESTERDAY...AND WE COULD ALSO SEE AN EARLIER START TO THE STORMS DUE TO ABUNDANT MORNING SUNSHINE. STORM MOTION SHOULD BE SLOWLY TOWARD THE NORTHEAST FOR MOST AREAS...WITH VERY LITTLE MOTION OVER THE WHITE MTNS AND GILA COUNTY. NO SIGNIFICANT FORECAST UPDATES NEEDED THIS MORNING. && .PREV DISCUSSION...(323 AM MST)...THIS MORNING...DEBRIS CLOUDS ARE THINNING ACROSS THE CWA...ALTHOUGH THE ENTIRE CLOUD FIELD IS PUSHING WESTWARD INTO MOHAVE COUNTY. SATELLITE PW ESTIMATES ARE AT 1-1.5 INCHES OVER THE LOWER COLORADO RIVER VALLEY WITH SFC DEW POINTS IN THE UPPER 60S IN THE LOWER DESERTS. THUS WE ARE EXPECTING ANOTHER ACTIVE THUNDERSTORM DAY...AS DEEP SOUTH-SOUTHWEST FLOW ALOFT KEEPS THE MOISTURE ADVECTING INTO THE AREA. LITTLE CHANGE IN THE OVERALL PATTERN AND SENSIBLE WEATHER IS EXPECTED HERE FOR TUESDAY AS HIGH PRESSURE REMAINS CENTERED OVER OKLAHOMA. FOR WEDNESDAY...WE HAVE INCREASED POPS SOME 20 - TO 30 PERCENT AS THE LATEST GUIDANCE HAS DELAYED THE ARRIVAL OF DRIER MORE STABLE AIR INTO WESTERN AZ. THESE DRYING CONDITIONS NOW LOOK TO ARRIVE THURSDAY AND SPREAD EASTWARD THROUGH AT LEAST FRIDAY AS THE WEST SOUTHWEST FLOW ALOFT INCREASES. PROGS HAVE BEEN CONSISTENT W/ LITTLE MOISTURE AND STABLE AIR OVER AREAS WEST OF A LINE FROM PAGE TO PAYSON. WE WILL NOT HAVE A TSTORM CHANCE FORECAST FOR THESE AREAS THROUGH AT LEAST FRIDAY. PROGS HAVE BEEN FLIPPING ON WHEN MOISTURE MOVES WESTWARD...WITH LATEST INDICATIONS SHOWING A MUCH SLOWER RETURN. SO WILL FORECAST A SLIGHT CHANCE ACROSS THE MOGOLLON RIM AND APACHE COUNTY AND KEEP IT DRY ELSEWHERE FOR NOW. && .AVIATION...FOR THE 18Z PACKAGE...FROM 18Z-03Z SCT-NMRS SHRA/TSRA WILL DEVELOP WITH MVFR/IFR CONDITIONS IN THE STRONGER STORMS. GENERAL STORM MOTION SOUTHWEST TO NORTHEAST. AFTER 03Z...SHRA/TSRA WILL DIMINISH IN INTENSITY...HOWEVER WDLY SCT -SHRA AND ISOLD TSRA MAY CONTINUE OVERNIGHT...WITH LIGHT WINDS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS.. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC..................JJ AVIATION................BAK FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 618 AM MST MON AUG 1 2011 AZZ004>018-037>040-020715- 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- 618 AM MST MON AUG 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 A MOIST AIR MASS WILL REMAIN OVER NORTHERN ARIZONA. EXPECT ISOLATED LIGHT SHOWERS THIS MORNING...THEN SCATTERED TO NUMEROUS THUNDERSTORMS THIS AFTERNOON AND EVENING. THUNDERSTORMS MAY CONTINUE WELL INTO THE EVENING HOURS OVER NAVAJO AND APACHE COUNTIES. THREATS FROM THE STORMS INCLUDE HEAVY RAINFALL AND CLOUD TO GROUND LIGHTNING. RECENT BURN AREAS...INCLUDING THE SCHULTZ...WALLOW...AND LOCUST ARE VULNERABLE TO FLOODING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY DEEP MOISTURE WILL REMAIN OVER NORTHERN ARIZONA THROUGH WEDNESDAY. EXPECT SCATTERED TO NUMEROUS THUNDERSTORMS WITH HEAVY RAIN. FROM THURSDAY THROUGH FRIDAY...THUNDERSTORMS COVERAGE IS EXPECTED TO DECREASE SIGNIFICANTLY ACROSS THE NORTHLAND...WITH ISOLATED COVERAGE AT BEST IN THE NORTHWESTERN PART OF THE STATE AND WIDELY SCATTERED COVERAGE ELSEWHERE. .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.
A trained spotter in Tonto Village reported approximately 1.50 inches of rain in 30 minutes.
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, August 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: 338699.