A thunderstorm produced damaging winds and small hail over central Apache Country.
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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 damaging winds and small hail over central Apache Country.
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 23, 3:15 PM MST, 2 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 315 PM MST MON AUG 23 2010 .SYNOPSIS...MONSOON MOISTURE WILL REMAIN OVER PORTIONS OF ARIZONA THROUGH THE COMING WEEK. DRIER AIR ACROSS THE NORTHERN BORDER AREA WILL RESULT IN ISOLATED THUNDERSTORM ACTIVITY OVER THE NEXT FEW DAYS. ELSEWHERE...UNDER DEEPER MOISTURE SCATTERED AFTERNOON AND EVENING STORMS WILL CONTINUE...MOST NUMEROUS ALONG AND SOUTH OF THE MOGOLLON RIM. && .DISCUSSION...SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPED OVER MUCH OF THE HIGH COUNTRY SOUTH OF A BAGDAD TO KAYENTA LINE LATE THIS MORNING AND AFTERNOON. THERE WERE A FEW ISOLATED STORMS NORTH OF THIS LINE. SOME OF THESE STORMS PRODUCED VERY HEAVY RAINFALL. A STORM OVER THE FLAGSTAFF AIRPORT PRODUCED AN INCH OF RAIN IN ABOUT 30 MINUTES. WATER VAPOR SHOWED DRIER AIR MOVING ACROSS NORTHWEST ARIZONA FROM ABOUT SELIGMAN TO PAGE THIS AFTERNOON IN RESPONSE TO A TROUGH MOVING THROUGH THE NORTHERN ROCKIES. MOST STORMS SHOULD DIMINISH THIS EVENING ALTHOUGH A FEW COULD LAST WELL INTO THE NIGHT. FOR TUESDAY THROUGH THURSDAY...HIGH PRESSURE WILL MEANDER ACROSS THE SOUTHWEST UNITED STATES ESSENTIALLY REMAINING CENTERED OVER ARIZONA. DRIER AIR WILL LINGER ALONG THE UTAH BORDER ON TUESDAY FOR ISOLATED STORMS THERE. SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE ALONG AND SOUTH OF THE MOGOLLON RIM. BY WEDNESDAY AND THURSDAY...AS THE HIGH CENTER NUDGES EASTWARD...ACTIVITY WILL BECOME SCATTERED ACROSS ALL OF NORTHERN ARIZONA ONCE AGAIN AS MOISTURE HEADS NORTHWARD. FOR FRIDAY AND THE WEEKEND...ANOTHER LOW WILL APPROACH THE WEST COAST DRAWING MOISTURE NORTHWARD. HOWEVER...THERE ARE MODEL DIFFERENCES IN THIS TIME PERIOD. THE EUROPEAN MODEL BUILDS THE LOW ALONG THE WEST COAST DRAWING SIGNIFICANT MOISTURE NORTHWARD WITH WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY THROUGH THE WEEKEND. THE GFS BRINGS IN A DEEPER AND MORE PROGRESSIVE LOW WITH A ROUND OF SHOWERS AND STORMS ON FRIDAY BUT WITH DRIER AIR PUSHING ACROSS ARIZONA FROM THE WEST AND SOUTHWEST OVER THE WEEKEND. FOR NOW...HAVE TAKE THE MIDDLE GROUND AND GONE WITH NEAR CLIMO POPS. SIGNIFICANT CHANGES TO THE FORECAST ARE POSSIBLE DEPENDING ON THE STRENGTH AND POSITION OF THE DEVELOPING TROUGH. PLEASE CHECK BACK FOR UPDATES CONCERNING THE WEEKEND SYSTEM. && .AVIATION...FOR THE 00Z PACKAGE...EXPECT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS THROUGH AROUND 03Z MAINLY SOUTH OF A LINE FROM SELIGMAN TO FLAGSTAFF TO CHINLE. MVFR AND LOCAL IFR CONDITIONS WILL OCCUR NEAR THE STRONGER STORMS. SURFACE WINDS MAY ALSO BECOME ERRATIC AND GUSTY AT TIMES DUE TO THUNDERSTORM OUTFLOWS. VFR CONDITIONS WILL PREVAIL OVERNIGHT...THEN ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS IS EXPECTED TO DEVELOP AFTER 17Z/TUE...MAINLY ALONG AND SOUTH OF A LINE FROM PRESCOTT...TO FLAGSTAFF TO WINDOW ROCK. DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. PUBLIC.................MAS AVIATION...............JJ VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1048 AM MST MON AUG 23 2010 AZZ004>018-037>040-240845- 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- 1048 AM MST MON AUG 23 2010 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 TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL DEVELOP BY THE EARLY AFTERNOON. SOME AREAS MAY RECEIVE HEAVY RAINFALL WITH LOCALIZED FLOODING POSSIBLE. SOME STORMS MAY CONTINUE INTO THE NIGHTTIME HOURS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY MONSOON MOISTURE IN PLACE WILL PRODUCE ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS EACH DAY. AN APPROACHING TROUGH MAY INCREASE THE STRENGTH OF SOME THUNDERSTORMS FOR FRIDAY AND SATURDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Flagstaff radar (KFSX), 132 km away, was scanning. The volume nearest the first event began at 00:15 UTC.
1 thunderstorm wind. Local standard time, as filed.
Damaging thunderstorm winds hit the Petrified Forest National Park. Stop signs were blown down and small trees were snapped. A wind sensor measured a peak wind gust of 107 MPH.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2010Every state in 2010This day in weather historyWarnings in Arizona, August 2010
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: 258535.