Another mid level trough tapped adequate moisture to produce thunderstorms south and west of Tucson. Damaging wind gusts resulted.
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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.
Another mid level trough tapped adequate moisture to produce thunderstorms south and west of Tucson. Damaging wind gusts resulted.
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 10, 2:12 PM MST, 1 hour 38 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 212 PM MST FRI AUG 10 2012 .SYNOPSIS...STRONG HIGH PRESSURE WILL BRING HOT TEMPERATURES THROUGH THE WEEKEND WITH NEAR RECORD HIGHS IN SOME LOCATIONS. ISOLATED THUNDERSTORMS WILL BE LIMITED TO AREAS FROM TUCSON WESTWARD AND MAINLY NEAR THE MOUNTAINS THROUGH SATURDAY BEFORE INCREASING AGAIN EARLY NEXT WEEK. && .DISCUSSION...LATEST VIS SATELLITE IMAGERY SHOWS A DECENT CU FIELD MAINLY ACROSS PIMA/SANTA CRUZ AND COCHISE COUNTIES WITH JUST AN ISOLATED SHOWER OR TWO IN THE LAST HOUR OVER FAR WESTERN COCHISE/EASTERN SANTA CRUZ COUNTY. MEANWHILE...RELATIVELY DRIER AIR REMAINS IN CONTROL ACROSS MUCH OF THE FORECAST AREA WITH PWAT VALUES RANGING FROM ABOUT 0.75 INCHES ACROSS EASTERN AREAS TO 1.25 INCHES ACROSS THE WESTERN DESERTS. A WEAK INVERTED TROUGH IS SEEN ON THE LATEST WV IMAGERY MAKING ITS WAY NORTHWEST FROM SONORA MEXICO. WITH THAT SAID...EXPECT THE INFLUENCE OF THE TROUGH IN COMBINATION WITH THE MOISTURE FIELD TO RESULT IN A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS MAINLY FROM THE TUCSON AREA SOUTH AND WEST INTO THIS EVENING. THE WESTERN DESERTS WILL STILL BE UNDER THE INFLUENCE OF THIS INVERTED TROUGH SATURDAY WITH A FAIRLY SIMILAR SETUP EXPECTED RESULTING IN A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS MAINLY TO THE WEST OF TUCSON. BY SUNDAY AND INTO EARLY NEXT WEEK...LOOKING AT A GRADUAL INCREASE IN MOISTURE COMING AROUND THE HIGH PRESSURE ALOFT PARKED NEAR THE ARIZONA/NEW MEXICO BORDER TO AT LEAST BRING A SLIGHT CHANCE OF SHOWERS AND STORMS TO THE REMAINDER OF THE FORECAST AREA. TEMPERATURES ARE EXPECTED TO PEAK BY SUNDAY AND MONDAY WITH HIGHS JUST SHY OF 110 DEGREES IN TUCSON. BY MIDWEEK WE'LL BE WATCHING THE MOISTURE FROM WHAT IS CURRENTLY TD ERNESTO AND WHAT WILL LIKELY BECOME HECTOR IN THE NEXT COUPLE DAYS AS THE CIRCULATION MOVES INTO THE EASTERN PACIFIC. MEDIUM RANGE GUIDANCE HAS BEEN CONSISTENT IN BRINGING INCREASED MOISTURE FROM THE SOUTH BY MID TO LATE NEXT WEEK AS THE RIDGING ALOFT ELONGATED MORE EAST-WEST INTO THE GULF COAST STATES. THIS WOULD BRING A RAMP UP IN THE MONSOON. STILL PLENTY OF TIME TO MONITOR THIS BUT THIS SHOULD KNOCK TEMPS BACK DOWN CLOSER TO NORMAL BY LATER NEXT WEEK. && .AVIATION...FEW-SCT CLOUDS AROUND 8-12K FT AGL INTO EARLY SATURDAY MORNING. SLIGHT CHANCE OF -TSRA/-SHRA MAINLY SOUTH AND WEST OF KTUS THIS AFTERNOON/EVENING. SURFACE WINDS THRU THIS EVENING OR 11/06Z ELY/SELY 5-15 KTS WITH LOCAL GUSTS TO 25 THROUGH 03Z SATURDAY...OTHERWISE GENERALLY LESS THAN 10 KTS. AVIATION DISCUSSION NOT UPDATED FOR TAF AMENDMENTS. && .FIRE WEATHER...STRONG HIGH PRESSURE ALOFT WILL RESULT IN A SLIGHT CHANCE OF THUNDERSTORMS FOR THE HIGHER TERRAIN AND AREAS WEST OF TUCSON THROUGH SATURDAY. THUNDERSTORM CHANCES WILL GRADUALLY INCREASE EARLY NEXT WEEK AS THE HIGH PRESSURE SYSTEM WEAKENS. GUSTY WINDS WILL SUBSIDE THIS EVENING...OTHERWISE EXPECT HOT DAYTIME TEMPERATURES WITH NORMAL DIURNAL WIND TRENDS INTO EARLY NEXT WEEK. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. WEATHER.GOV/TUCSON
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1215 PM MST FRI AUG 10 2012 AZZ501>503-515-110600- WESTERN PIMA COUNTY-TOHONO O'ODHAM NATION- UPPER SANTA CRUZ RIVER VALLEY/ALTAR VALLEY-BABOQUIVARI MOUNTAINS- 1215 PM MST FRI AUG 10 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST ARIZONA. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS THE REGION THIS AFTERNOON AND INTO THIS EVENING. OTHERWISE...THE MAIN STORY WILL BE THE CONTINUED VERY HOT TEMPERATURES. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ISOLATED SHOWERS AND THUNDERSTORMS ARE ONCE AGAIN EXPECTED THIS WEEKEND WITH A GRADUAL INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY BY THE MIDDLE OF NEXT WEEK. TEMPERATURES WILL REMAIN VERY HOT THIS WEEKEND WITH SOME GRADUAL COOLING NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ504>514-110600- TUCSON METRO AREA-SOUTH CENTRAL PINAL COUNTY- SOUTHEAST PINAL COUNTY-UPPER SAN PEDRO RIVER VALLEY- EASTERN COCHISE COUNTY BELOW 5000 FEET-UPPER GILA RIVER VALLEY- WHITE MOUNTAINS OF GRAHAM AND GREENLEE COUNTIES- GALIURO AND PINALENO MOUNTAINS-CHIRICAHUA MOUNTAINS- DRAGOON AND MULE AND HUACHUCA AND SANTA RITA MOUNTAINS- CATALINA AND RINCON MOUNTAINS- 1215 PM MST FRI AUG 10 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST ARIZONA. .DAY ONE...THIS AFTERNOON AND TONIGHT VERY HOT TEMPERATURES ARE EXPECTED THIS AFTERNOON WITH MAINLY DRY CONDITIONS EXPECTED. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ISOLATED SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS WEEKEND WITH A GRADUAL INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY BY THE MIDDLE OF NEXT WEEK. TEMPERATURES WILL REMAIN VERY HOT THIS WEEKEND WITH SOME GRADUAL COOLING NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. WEATHER.GOV/TUCSON
The Phoenix radar (KIWA), 181 km away, was scanning. The volume nearest the first event began at 22:51 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds ripped off about 40 feet of the roof to the auditorium at the Organ Pipe National Monument Visitor Center.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2012Every state in 2012This day in weather historyWarnings in Arizona, August 2012
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: 408855.