Thunderstorms produced heavy rain over the Wallow Burn Area which flooded roads south of Alpine.
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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 over the Wallow Burn Area which flooded roads south of Alpine.
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 24, 9:10 AM MST, 4 hours 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 910 AM MST WED AUG 24 2011 .SYNOPSIS...DAYTIME TEMPERATURES WILL BE ABOVE NORMAL AGAIN TODAY...ESPECIALLY ACROSS ELEVATIONS BELOW 4000 FEET. MOST OF NORTHERN ARIZONA WILL SEE SCATTERED AFTERNOON AND EVENING THUNDERSTORMS...WITH NUMEROUS STORMS IN THE WHITE MOUNTAINS. THUNDERSTORM ACTIVITY SHOULD INCREASE ACROSS THE NORTHLAND THROUGH SATURDAY. && .DISCUSSION... THE FORECAST THROUGH 11 PM TONIGHT HAS BEEN UPDATED TO INCREASE THUNDERSTORM PROBABILITIES ACROSS NORTHERN AZ. THIS MORNINGS BELLEMONT SOUNDING SHOWED A COOLING IN THE MID LEVELS AND WINDS NOW SOUTH AND SOUTHEAST WINDS FROM 12 KFT TO 30 KFT MSL. OUTFLOW WINDS LAST NIGHT FELL OFF THE RIM INTO NRN GILA COUNTY AND WESTWARD THROUGH COCO COUNTY. FINALLY A REMNANT MCV IS OVER CENTRAL NAVAJO COUNTY AND MAY HELP FORCE STORMS IN NORTHERN COCO COUNTY THIS AFTERNOON. PREV DISCUSSION 400 AM...STRONG HIGH PRESSURE WILL CONTINUE ACROSS THE FOUR CORNERS REGION INTO THE WEEKEND. VIGOROUS DAYTIME HEATING WILL PERSIST...WITH AFTERNOON MAXIMUM TEMPS WELL ABOVE NORMAL FOR MANY LOCATIONS AND CONVECTION KICKING OFF WIDELY SCATTERED STORMS ACROSS THE NORTHLAND. GREATEST PRECIPITATION COVERAGE IS ANTICIPATED ACROSS THE WHITE MOUNTAINS. EXTENDED RANGE MODELS INDICATE THAT THE HIGH PRESSURE RIDGE MAY FLATTEN AND SHIFT EASTWARD EARLY NEXT WEEK WITH WEAK LOW PRESSURE DEVELOPING ALONG THE WEST COAST. THIS COULD INDICATE AN INCREASE IN DRYING SOUTHWESTERLY FLOW...BUT CONFIDENCE IN THIS SCENARIO IS NOT HIGH AT THIS TIME. && .AVIATION...FOR THE 18Z PACKAGE...TIL 03Z...EXPECT SCT-NMRS SHRA/TSRA TO DEVELOP MAINLY OVER THE HIGHER TERRAIN AND DROP SOUTHWARD INTO THE LOWER VALLEYS AND DESERTS...LITTLE COLORADO RIVER VALLEY AND THE LOWER ELEVATIONS OF YAVAPAI AND NORTHERN GILA COUNTY WHERE STORM COVERAGE WILL RANGE FROM WDLY SCT TO SCT.. STORMS DECREASING BTWN 03-05Z THURSDAY. MVFR/IFR CONDITIONS WILL BE POSSIBLE IN THE STRONGER STORMS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES... EXCESSIVE HEAT WARNING FROM 10 AM THIS MORNING TO 8 PM MST THIS EVENING FOR AZZ006-018-037 BELOW 4000 FEET. && PUBLIC.......................DL / KD AVIATION.....................TC FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 920 AM MST WED AUG 24 2011 AZZ004>018-037>040-250715- 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- 920 AM MST WED AUG 24 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 DAYTIME TEMPERATURES WILL BE WELL ABOVE AVERAGE TODAY...AND AN EXCESSIVE HEAT WARNING IS IN EFFECT FOR ELEVATIONS BELOW 4000 FEET IN YAVAPAI AND NORTHERN GILA COUNTIES AS WELL AS THE GRAND CANYON. THE WHITE MOUNTAINS SHOULD SEE NUMEROUS THUNDERSTORMS THIS AFTERNOON AND EVENING. ELSEWHERE...SCATTERED THUNDERSTORM COVERAGE IS EXPECTED. STORMS WILL BE SLOW MOVING AND SOME WILL PRODUCE HEAVY RAIN AND SMALL HAIL. THE WALLOW...LOCUST AND SCHULTZ BURN AREAS HAVE A MODERATE RISK OF FLOODING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LOW-TO-MODERATE MONSOON THUNDERSTORM ACTIVITY IS ANTICIPATED. .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.
Heavy rain fell for about 45 minutes with a total of 0.65 in Alpine. Several County/Forest Service Roads and Highway 180 were flooded south of Alpine. One road was closed.
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: 343594.