Monsoon moisture caused scattered thunderstorms across northern Arizona caused heavy rain, flash flooding, a rock slide, and a funnel cloud.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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.
Monsoon moisture caused scattered thunderstorms across northern Arizona caused heavy rain, flash flooding, a rock slide, and a funnel cloud.
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 Jul 10, 8:55 PM MST, 5 hours 52 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 855 PM MST SUN JUL 10 2011 .SYNOPSIS...EXPECT ANOTHER ACTIVE DAY MONDAY WITH SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS. A PROGRESSIVE DRYING TREND WILL BEGIN ON TUESDAY WITH CHANCES FOR PRECIPITATION DROPPING INTO THE SINGLE DIGITS BY THURSDAY. MONSOONAL MOISTURE WILL MAKE ITS WAY BACK INTO THE STATE OVER THE WEEKEND. && DISCUSSION...CONVECTIVE ACTIVITY FADING AWAY IN A MORE ORDERLY MANNER TONIGHT COMPARED TO SATURDAY EVENING. A TROUGH ENTERING THE PACIFIC NORTHWEST WILL BRING ENOUGH DYNAMICS TO THE REGION LATER TONIGHT AND MONDAY TO MAKE THINGS INTERESTING. WOULD NOT BE SHOCKED TO SEE CONVECTION FIRE BACK UP TONIGHT TO OUR SOUTH WITH A GOOD POTENTIAL MONDAY FOR ORGANIZED CONVECTION. THIS IS THE PRECURSOR TO A DRYING TREND THAT WILL DEVELOP FROM WEST TO EAST TUESDAY AND WEDNESDAY...WITH A NEARLY PRECIPITATION-FREE FORECAST BY THURSDAY AND FRIDAY. ZONES/GRIDS LOOK GOOD...NO UPDATES TONIGHT. WE WILL STICK TO SHORT-TERM ISSUES. && .AVIATION...FOR THE 06Z PACKAGE...EXPECT SCT-BKN CIGS FROM 8-12KFT AGL WITH ISOLD SHRA/TSRA THROUGH 07Z-09Z...THEN PARTIAL CLEARING. STORMS WILL REDEVELOP EARLIER MONDAY MORNING...BY ABOUT 13Z-15Z FROM SOUTH TO NORTH. EXPECT NMRS SHRA/TSRA WITH ISOLD +TSRA BY 17Z-19Z. GUSTY AND ERRATIC WINDS AND MVFR/LCL IFR CONDITIONS ARE EXPECTED NEAR STORMS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC..................PETERSON AVIATION................PETERSON FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 936 AM MST SUN JUL 10 2011 AZZ004>018-037>040-110715- 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- 936 AM MST SUN JUL 10 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 WIDELY SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS TO DEVELOP OVER CLOUD-FREE AREAS BY LATE MORNING. WHERE CLOUD COVER EXISTS...VIGOROUS CONVECTION WILL LIKELY BE DELAYED BY A FEW HOURS. STORMS WILL DRIFT SLOWLY FROM SOUTH TO NORTH. TODAY'S STORMS WILL PRODUCE SMALL HAIL AND LOCALLY HEAVY PRECIPITATION...CAUSING SOME ISOLATED NUISANCE FLOODING. CONVECTION WILL DIMINISH WITHIN A FEW HOURS OF SUNSET IN MOST LOCATIONS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY LOOK FOR SHOWERS AND THUNDERSTORMS AGAIN MONDAY. BY TUESDAY...GRADUAL DRYING BEGIN TO CREEP EASTWARD ACROSS THE STATE. MOISTURE SHOULD RETURN NEXT WEEKEND. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. HOWARD
The Flagstaff radar (KFSX), 124 km away, was scanning. The volume nearest the first event began at 19:06 UTC.
1 debris flow, 1 flash flood, 1 funnel cloud. Local standard time, as filed.
The Department of Public Safety reported a rockfall on Highway 89 about 4 miles northeast of Congress.
Minor flooding was reported in the Greer area. Drainages were flowing 20 to 50 feet wide and 12 to 18 inches deep in Bulter Canyon and East Fork of the Little Colorado River. Water was flowing across the southern portion of East Fork Road. The Little Colorado River was up 18 inches.
A Department of Public Safety worker reported a funnel cloud northwest of Eager. Radar showed an approximate distance of 10 miles northwest of Eager.
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, July 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: 333042, 333035, 333038.