1 flash flood, as filed by the National Weather Service.
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 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 17, 2:15 PM MST, 1 hour 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 215 PM MST TUE AUG 17 2004 SOUTHEAST ARIZONA FORECAST DISCUSSION .SYNOPSIS...HIGH PRESSURE HAS BEGUN TO BUILD SOUTHWEST OF CALIFORNIA TODAY INDUCING A DRYING TREND THIS WEEK. ENOUGH MOISTURE WILL REMAIN OVER THE AREA FOR TYPICAL AFTERNOON AND EVENING THUNDERSTORMS. OTHERWISE... NEAR TO SLIGHTLY BELOW NORMAL DAYTIME TEMPERATURES ARE EXPECTED. AN INCREASE IN MOISTURE WILL BEGIN OVER THE WEEKEND FOR A BETTER CHANCE OF THUNDERSTORMS. && .DISCUSSION...THUNDERSTORMS HAVE BEGUN TO DEVELOP ACROSS THE AREA THIS AFTERNOON HELPED ALONG BY PLENTY OF SUNSHINE THIS MORNING. A FEW STRONG THUNDERSTORMS WITH HEAVY RAIN HAVE OCCURRED IN CENTRAL PIMA... WESTERN SANTA CRUZ AND NORTHERN GREENLEE COUNTIES ALREADY. THUNDERSTORM ACTIVITY WILL CONTINUE TO DEVELOP THROUGH THIS EVENING ACROSS SOUTHEASTERN ARIZONA WITH HEAVY RAINFALL THE GREATEST THREAT. OTHERWISE... THE UPPER LEVEL TROUGH CENTERED OVER THE GREAT SALT LAKE AND EXTENDING INTO WESTERN NEW MEXICO HAS SHIFTED SLIGHTLY TO THE EAST AS HIGH PRESSURE BUILDS INTO CALIFORNIA. AS THIS RIDGE STRENGTHENS DRIER AIR WILL MOVE INTO THE STATE RESULTING IN A DECREASE CHANCE OF THUNDERSTORMS. BY WEEKS END THE RIDGE WILL BE FORCED EASTWARD BY A PIECE OF ENERGY BREAKING AWAY FROM A TROUGH OVER THE PACIFIC. AS THE RIDGE MOVES EAST A SOUTHERLY COMPONENT TO THE FLOW WILL RETURN TO SOUTHEAST ARIZONA AND THUS TAP INTO THE MOISTURE OVER NORTHERN MEXICO. ERGO... THE CHANCES FOR CONVECTIVE ACTIVITY WILL ONCE AGAIN INCREASE. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. EVANS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1155 AM MST TUE AUG 17 2004 AZZ019-029>035-180700- NORTHERN GREENLEE COUNTY-UPPER GILA RIVER VALLEY-COCHISE COUNTY- SOUTHEAST PINAL COUNTY-TUCSON METRO/MARANA/GREEN VALLEY- SANTA CRUZ COUNTY-TOHONO OODHAM NATION-WESTERN PIMA COUNTY- 1155 AM MST TUE AUG 17 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ARIZONA .DAY ONE...TODAY SYNOPSIS...ACTIVITY WILL BE A LITTLE LESS TODAY IN THE WAKE OF THE UPPER LEVEL DISTURBANCE THAT MOVED THROUGH THE AREA ON MONDAY. HOWEVER...THERE WILL BE A SLIGHT RISK FOR SEVERE THUNDERSTORMS WITH FLASH FLOODING STILL A THREAT. DISCUSSION...THE AREA IS SLIGHTLY MORE STABLE AND DRIER THAN YESTERDAY WITH THE AREA IN THE WAKE OF THE UPPER LEVEL DISTURBANCE THAT MOVED THROUGH THE AREA. HOWEVER...THERE IS STILL ENOUGH MOISTURE AROUND TO SUPPORT ISOLATED TO SCATTERED THUNDERSTORMS FROM CENTRAL PIMA COUNTY EAST. THERE IS ALSO ENOUGH SHEAR IN THE ATMOSPHERE TO SUPPORT ISOLATED SEVERE THUNDERSTORMS. THE THREAT FOR FLASH FLOODING IS STILL ABOVE CLIMATOLOGY...ESPECIALLY IN AREAS THAT HAVE BEEN HIT HARD OVER THE PAST 10 DAYS...LIKE CENTRAL PIMA COUNTY...SANTA CRUZ AND COCHISE COUNTIES. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. DRIER WESTERLY FLOW ALOFT WILL OVERTAKE THE REGION STARTING WEDNESDAY AND CONTINUE INTO THE FIRST HALF OF THE WEEKEND. STORMS WILL BECOME MORE ISOLATED AND CONFINED NEAR THE MOUNTAINS BY FRIDAY. THERE ARE MORE SIGNS THAT A SOMEWHAT MORE ACTIVE PATTERN WILL DEVELOP LATE IN THE WEEKEND. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Tucson radar (KEMX), 135 km away, was scanning. The volume nearest the first event began at 23:01 UTC.
1 flash flood. Local standard time, as filed.
Highway 70, west of the town of Pima, was closed due to flooding of the Matthews wash. Also a swift water rescue was performed when a truck got stuck in the Talley wash near Thatcher.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2004Every state in 2004This day in weather historyWarnings in Arizona, August 2004
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: 5418622.