Thunderstorms with heavy rainfall produced flash flooding across portions of Eastern Pima and Cochise counties.
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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 TWC wrote it up.
Thunderstorms with heavy rainfall produced flash flooding across portions of Eastern Pima and Cochise counties.
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 Tucson, AZ wrote its last area forecast discussion before the first event at Aug 1, 1:50 PM MST, 3 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 150 PM MST WED AUG 1 2007 .SYNOPSIS...A VERY MOIST AIR MASS OVER THE REGION AND WEAK DISTURBANCES EMBEDDED IN THE FLOW ALOFT WILL MAKE FOR A FEW MORE ACTIVE THUNDERSTORM DAYS. AS MOISTURE LEVELS REMAIN HIGH...THE THREAT FOR HEAVY RAINFALL AND RUNOFF PROBLEMS WILL CONTINUE. A LOW PRESSURE TROUGH DEEPENING ALONG THE WEST COAST MAY SPREAD DRIER AIR INTO THE REGION NEXT WEEK FOR A DECREASE IN THUNDERSTORM CHANCES. && .DISCUSSION...THUNDERSTORMS HAVE BEEN SLOW TO GET STARTED TO TODAY AS THE CAP ALOFT SEEMS TO HAVE STRENGTHENED. A FEW TOWERING CU HAVE POPPED THE CAP TO THE EAST AND WEST OF THE TUCSON METRO AREA AND BECOME THUNDERSTORMS...BUT THEY HAVE BEEN SHORT LIVED. AS THE AFTERNOON PROGRESSES THE CAP/S STRENGTH SHOULD DIMINISH RESULTING IN SCATTERED THUNDERSTORMS ACROSS SOUTHEASTERN ARIZONA. AND SINCE THE FLOW IN THE LOWER AND MID ATMOSPHERE IS WEAK...HEAVY RAIN LEADING TO FLASH FLOODING IS THE MAIN CONCERN. AT 130 PM MST SATELLITE IMAGERY INDICATED THE DISTURBANCE SOUTH OF NEW MEXICO IS TRACKING TO THE NORTH AS THE NAM AND GFS MODELS FORECAST...HOWEVER IT IS FURTHER WEST. SINCE IT IS CLOSER TO ARIZONA ITS INFLUENCE MAY BE FELT IN COCHISE COUNTY LATER THIS EVENING AND BEARS WATCHING. DEEP MOISTURE WILL REMAIN IN PLACE OVER SOUTHERN ARIZONA FOR THE NEXT SEVERAL DAYS ALONG WITH WEAK DISTURBANCES SKIRTING THE AREA FOR CONTINUED MAINLY AFTERNOON AND EVENING THUNDERSTORMS. THE NEXT SYNOPTIC SCALE FEATURE TO AFFECT OUR WEATHER WILL BE AN INVERTED TROUGH/EASTERLY WAVE. THIS WAVE IS FORECAST TO MOVE ACROSS SOUTHERN CHIHUAHUA AND SOUTHERN SONORA...MEXICO FRIDAY AND SATURDAY AS A TROUGH OF LOW PRESSURE DIGS ALONG THE WEST COAST. THE GFS THEN FORECASTS THE WAVE TO GET CAUGHT IN THE SOUTHWEST FLOW OF THE TROUGH AND EVENTUALLY MOVES IT ACROSS ARIZONA ON MONDAY AND TUESDAY. AFTER DYNAMICAL FORCING PUSHES THROUGH THE AREA THE SOUTHWESTERLY FLOW WILL BRING DRIER AIR INTO THE REGION MIDWEEK. THEREFORE...A TREND FOR LOWER CHANCES OF SHOWERS AND THUNDERSTORMS WILL BEGIN ON TUESDAY. && .AVIATION...TSTMS HAVE REMAINED CONFINED TO MTNS SO FAR...BUT WITH A SLIGHT INCREASE IN SE WINDS ALOFT LATER THIS AFTERNOON...A FEW ARE EXPECTED TO PUSH NW AND PASS OVER OR CLOSE TO ALL TAF SITES LATE THIS AFTERNOON OR EARLY THIS EVENING. ANY TSTM COULD BRING VISIBILITIES BRIEFLY TO IFR...CIGS TO MVFR...AND GUSTS TO 40KTS. BASED ON DEVELOPMENT SO FAR...THE RISK FOR MULTI-HOUR TSRA AT ANY ONE SITE IS DIMINISHING...SO WE WILL MONITOR CLOSELY AND REMOVE TEMPO GROUPS AS NEEDED. EXPECTING DEBRIS 120-150 CLOUD DECKS OVERNIGHT...BUT IF THAT DOES NOT HAPPEN...WE COULD AGAIN SEE PATCHY LOW CLOUDS/FOG AROUND SUNRISE. HAVE NOT CARRIED THAT IN TAFS OR TWEBS AT THIS TIME SINCE CONFIDENCE IS TOO LOW. AVIATION DISCUSSION NOT UPDATED FOR TAF AND TWEB AMENDMENTS. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...EVANS AVIATION...PYTLAK WEATHER.GOV/TUCSON
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1047 AM MST WED AUG 1 2007 AZZ019-029>035-020700- NORTHERN GREENLEE COUNTY-SOUTHEAST PINAL COUNTY- UPPER GILA RIVER VALLEY-WESTERN PIMA COUNTY-TOHONO OODHAM NATION- TUCSON METRO/MARANA/GREEN VALLEY-SANTA CRUZ COUNTY-COCHISE COUNTY- 1047 AM MST WED AUG 1 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARIZONA AND SOUTHEAST ARIZONA. .DAY ONE...TODAY AND TONIGHT THERE IS A RISK OF STRONG THUNDERSTORMS ONCE AGAIN THIS AFTERNOON AND EVENING...WITH HEAVY RAIN AND ISOLATED FLASH FLOODING THE MAIN CONCERNS. INITIALLY...THUNDERSTORMS WILL TEND TO REMAIN NEAR MOUNTAINS EARLY THIS AFTERNOON BECAUSE STEERING WINDS WERE VERY LIGHT. HOWEVER COMPUTER MODELS FORECAST MID LEVEL WINDS TO INCREASE A BIT THIS AFTERNOON...WHICH WILL TEND TO PUSH STORMS SLOWLY TO THE WEST OR NORTHWEST. A WEAK UPPER LEVEL DISTURBANCE OVER NORTHWEST CHIHUAHUA WAS ALSO MOVING TOWARD COCHISE COUNTY...AND MAY ENHANCE DEVELOPMENT LATE THIS AFTERNOON AND THIS EVENING ACROSS MUCH OF SOUTHEAST ARIZONA. BECAUSE OF THE WIDESPREAD HEAVY RAINS YESTERDAY...THE ATMOSPHERE WILL TAKE LONGER TO DESTABILIZE TODAY. THUS IT MAY TAKE LONGER FOR THUNDERSTORMS TO SPREAD INTO THE VALLEYS AND DESERTS COMPARED TO YESTERDAY. HOWEVER ONCE THEY DO...THEY WILL AGAIN HAVE A TENDENCY TO CLUSTER AND MERGE...WHILE PRODUCING RAINFALL RATES OF 1 TO 2 INCHES PER HOUR AND PERHAPS ISOLATED WIND GUSTS TO 50 MPH. IF THE THUNDERSTORMS BECOME MORE ORGANIZED...FLASH FLOOD WATCHES MAY NEED TO BE ISSUED. REGARDLESS IF THE THEY BECOME ORGANIZED OR NOT...ANY SIGNIFICANT RAIN ON SATURATED SOILS OVER SOUTHEAST ARIZONA WILL LIKELY CAUSE RUNOFF PROBLEMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE RISK OF STRONG THUNDERSTORMS WITH HEAVY RAIN WILL CONTINUE FOR SEVERAL MORE DAYS...ALTHOUGH ACTIVITY MAY BE A BIT LESS WIDESPREAD THURSDAY. INITIALLY IT APPEARED THAT THE RISK OF THUNDERSTORMS WOULD DIMINISH LATE IN THE WEEK...BUT A NEW UPPER LEVEL DISTURBANCE IS NOW FORECAST TO DEVELOP OVER NORTHERN MEXICO AND MOVE WEST TOWARD THE REGION BY FRIDAY OR SATURDAY. THIS WILL BE MONITORED CLOSELY SINCE ANY ADDITIONAL RAINS OVER THE NEXT SEVERAL DAYS COULD ONCE AGAIN INCREASE THE RISK OF FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. PYTLAK
The Tucson radar (KEMX), 119 km away, was scanning. The volume nearest the first event began at 00:16 UTC.
2 flash flood. Local standard time, as filed.
Flash flooding from thunderstorms in the City of Douglas caused damage to several city buildings and facilities.
A swift water rescue occurred at Wilmot and Interstate 10 in Southeast Tucson due to flash flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2007Every state in 2007This day in weather historyWarnings in Arizona, August 2007
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: 54289, 51105.