A thunderstorm produced heavy rain and flash flooding over Snowbowl Road.
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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 flash flooding over Snowbowl Road.
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 27, 3:30 PM MST, 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 330 PM MST FRI AUG 27 2010 .SYNOPSIS...LOW PRESSURE APPROACHING FROM THE WEST IS ALLOWING MOISTURE TO SURGE ACROSS ARIZONA WITH WET AND UNSETTLED WEATHER EXPECTED FOR THE REMAINDER OF TODAY AND SATURDAY. SOUTHWEST FLOW ALOFT SHOULD BEGIN TO PUSH MOISTURE EASTWARD SATURDAY NIGHT...LEAVING MAINLY DRY BUT BREEZY WEATHER FOR SUNDAY AND MONDAY. && .DISCUSSION...AN APPROACHING WEST COAST TROUGH HAS ENABLED INCREASING MOISTURE TO SHIFT INTO NORTHERN ARIZONA...AND THUNDERSTORMS HAVE BEEN MORE NUMEROUS THAN RECENT DAYS ACROSS COCONINO AND YAVAPAI COUNTIES. STORMS HAVE DISPLAYED VERY WEAK STORM MOTION AND THIS COUPLED WITH CELLS TRAINING OVER THE SAME LOCATIONS HAVE LED TO SOME QUITE HEAVY LOCALIZED RAINFALL AMOUNTS. IN PARTICULAR...PORTIONS OF CENTRAL YAVAPAI COUNTY HAVE SEEN PRECIPITATION IN EXCESS OF 1.5" WITH SEVERAL URBAN AND SMALL STREAM FLOOD ADVISORIES BEING ISSUED THIS AFTERNOON. AREAS OF PRECIPITATION ARE LIKELY TO CONTINUE OVERNIGHT...THOUGH THE INTENSITY OF THE SHOWERS WILL PROBABLY BE DECREASED. SCATTERED THUNDERSTORMS ARE LIKELY FOR SATURDAY AS WELL...WITH THE THREAT FOR HEAVY RAINFALL SHIFTING EAST TOWARDS THE NEW MEXICO BORDER DURING THE DAY. SATURDAY AFTERNOON...AS THE PRESSURE GRADIENT AHEAD OF THE TROUGH STRENGTHENS...WE WILL ALSO EXPERIENCE INCREASING SOUTHWEST WINDS ACROSS THE NORTHLAND. THE STRONGEST GUSTS ARE LIKELY OVER OUR WESTERN AND NORTHWESTERN ZONES...BUT ARE CURRENTLY EXPECTED TO REMAIN JUST BELOW WIND ADVISORY THRESHOLDS AT THIS TIME. BY LATE IN THE WEEKEND AND INTO EARLY NEXT WEEK...SOME DRYING IS ANTICIPATED AS THE SOUTHWESTERLY FLOW PUSHES THE GREATEST MOISTURE JUST EAST OF THE STATE WITH SOME SUBSIDENCE ALOFT. STILL...SLIGHT CHANCES FOR PRECIP WILL REMAIN IN THE FORECAST. BY THE MIDDLE OF NEXT WEEK...A SHIFT IN FLOW MAY ALLOW MONSOON MOISTURE TO AGAIN SHIFT NORTHWARD INTO NORTHERN ARIZONA WITH TYPICAL DAILY THUNDERSTORM ACTIVITY APPEARING A LIKELY SCENARIO AT THIS TIME. && .AVIATION...FOR THE 00Z PACKAGE...NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE WEST OF A PAGE-WINSLOW LINE THROUGH 02Z. SOME SHRA/TSRA WILL CONTINUE THROUGH THE OVERNIGHT HOURS AND SPREAD EASTWARD ACROSS THE REST OF NORTHERN ARIZONA. SCT THUNDERSTORMS WILL REDEVELOP AFT 18Z SAT. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. PUBLIC.................KD AVIATION...............LATTO VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1016 AM MST FRI AUG 27 2010 AZZ004>018-037>040-280715- 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- 1016 AM MST FRI AUG 27 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 SHOWERS AND THUNDERSTORMS WILL CONTINUE TO FORM THROUGH THE LATE MORNING AND AFTERNOON HOURS ACROSS NORTHERN ARIZONA TODAY AS LOW LEVEL MOISTURE INCREASES OVER THE REGION. THE GREATEST LIKELIHOOD FOR PRECIPITATION THROUGH TONIGHT WILL BE ACROSS YAVAPAI...COCONINO...AND NORTHERN GILA COUNTIES...WITH LESSER CHANCES FURTHER EAST IN NAVAJO AND APACHE COUNTIES. SOME AREAS MAY RECEIVE HEAVY RAINFALL WITH LOCALIZED FLOODING...AND RAIN WILL CONTINUE INTO THE NIGHTTIME HOURS FOR SOME LOCATIONS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY AS A WEST COAST TROUGH APPROACHES OVER THE WEEKEND...THE CHANCE FOR THUNDERSTORMS WILL PERSIST EACH DAY. SOME DRYING IS POSSIBLE EARLY NEXT WEEK...MOST LIKELY AROUND MONDAY AND TUESDAY...BUT MONSOON MOISTURE IS FORECAST TO RETURN FOR THE REMAINDER OF THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Flagstaff radar (KFSX), 95 km away, was scanning. The volume nearest the first event began at 22:46 UTC.
1 heavy rain, 1 flash flood. Local standard time, as filed.
A thunderstorm produced 2.20 inches of rain at Hart Prairie Lodge at Arizona Snowbowl. Small hail accumulated to a dept of one inch.
Water flowed over Snowbowl Road near the ski lodge. No significant damage was reported.
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: 258773, 258774.