Monsoon thunderstorms produced a microburst over the Tohono O'odham Nation.
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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.
Monsoon thunderstorms produced a microburst over the Tohono O'odham Nation.
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 11, 1:50 PM MST, 4 hours 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 150 PM MST SAT AUG 11 2007 .SYNOPSIS...HIGH PRESSURE ALOFT WILL STRENGTHEN OVER THE REGION THE NEXT SEVERAL DAYS RESULTING IN ABOVE SEASONABLE HIGH TEMPERATURES. MOISTURE SHOULD REMAIN ADEQUATE ENOUGH TO SUPPORT A CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS INTO NEXT WEEK...MAINLY NEAR THE MOUNTAINS. && .DISCUSSION...HIGH PRESSURE ALOFT WAS CENTERED OVER THE SOUTH PLAINS TODAY WITH A MODERATE SOUTH TO SOUTHEAST FLOW OVER ARIZONA. THIS FLOW BROUGHT ON AN INCREASE IN MOISTURE LAST NIGHT AS IT SPREAD WEST AND NORTHWARD. PWATER VALUES WERE NOW RUNNING OVER 100 PERCENT OF NORMAL AT TUCSON...PHOENIX...AND FLAGSTAFF. EVEN WITH THIS MOISTURE INCREASE...CUMULUS CLOUDS HAVE BEEN SLOW TO FORM IN THE MOUNTAINS TODAY IN THE ABSENCE OF A LARGE SCALE LIFTING MECHANISM. THIS HAS ESPECIALLY BEEN THE CASE IN SOUTHEAST ARIZONA. BASED ON THE TUCSON 12Z UPPER AIR SOUNDING...EXPECT A LATE START TO THUNDERSTORMS TODAY IN THE MOUNTAINS WITH A LESS FAVORABLE STEERING FLOW FOR WIDESPREAD VALLEY STORMS THIS EVENING. HOWEVER...STORMS THAT MANAGE TO DRIFT OVER THE LOWER DESERTS COULD PRODUCE HAIL...STRONG WINDS...AND LOCALIZED FLOODING. BEYOND THIS EVENING...MODELS CONTINUED TO SHOW THE UPPER HIGH EXPANDING WESTWARD THE NEXT FEW DAYS. THIS WESTWARD BUILDING SHOULD RESULT IN WARMER HIGH TEMPERATURES WITH PROJECTED READINGS AROUND 2 TO 4 DEGREES ABOVE NORMAL. MODELS ALSO WERE NOT SHOWING ANY SIGNIFICANT LARGE SCALE FEATURES THAT WOULD ENHANCE THUNDERSTORM ACTIVITY NEXT WEEK. THUS...POP VALUES MAINLY IN THE ISOLATED OR SLIGHT CHANCE CATEGORIES LOOK LIKE THE WAY TO GO FOR NOW...WITH HIGHEST POP VALUES IN THE MOUNTAINS. && .AVIATION...ISOLATED THUNDERSTORMS THROUGH THIS EVENING...ASSOCIATED WITH CB/S GENERALLY AROUND 6-8 KFT AGL...THOUGH CIGS AS LOW AS 3 KFT AGL WITH THE STRONGEST TSTMS. AVIATION DISCUSSION NOT UPDATED FOR TAF AND TWEB AMENDMENTS. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. WEATHER.GOV/TUCSON
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 620 AM MST SAT AUG 11 2007 AZZ029-031>035-121330- SOUTHEAST PINAL COUNTY-WESTERN PIMA COUNTY-TOHONO OODHAM NATION- TUCSON METRO/MARANA/GREEN VALLEY-SANTA CRUZ COUNTY-COCHISE COUNTY- 620 AM MST SAT AUG 11 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARIZONA AND SOUTHEAST ARIZONA. .DAY ONE...TODAY AND TONIGHT ATMOSPHERIC CONDITIONS ARE MORE UNSTABLE TODAY THAN RECENT DAYS. WITH PLENTY OF AVAILABLE MOISTURE AND MORNING SUNSHINE...EXPECT SCATTERED SHOWERS AND THUNDERSTORMS TO DEVELOP BY AFTERNOON HOURS. A FEW STORMS ARE EXPECTED TO PRODUCE DAMAGING WINDS AND LARGE HAIL AS WELL AS LOCALLY HEAVY RAIN. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. WITH SOME DRYING FROM THE EAST AND SOUTHEAST...STORM COVERAGE IS EXPECTED TO DIMINISH OVERALL EARLY IN THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Tucson radar (KEMX), 114 km away, was scanning. The volume nearest the first event began at 01:39 UTC.
1 thunderstorm wind. Local standard time, as filed.
Roof blown off house in Topawa.
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: 51121.