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 3, 1:20 PM MST, 5 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 120 PM MST TUE AUG 3 2004 SOUTHEAST ARIZONA FORECAST DISCUSSION .SYNOPSIS...HIGH PRESSURE CENTERED OVER TEXAS WILL PROVIDE THE REGION WITH A MOIST SOUTHERLY FLOW THE NEXT FEW DAYS. AN UPPER LEVEL DISTURBANCE WILL MOVE ACROSS SOUTHEAST ARIZONA WEDNESDAY FOR A MORE FAVORABLE CHANCE FOR SHOWERS AND THUNDERSTORMS. OTHERWISE...A CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS WILL PERSIST INTO EARLY NEXT WEEK. HIGH TEMPERATURES WILL BE SLIGHTLY ABOVE NORMAL THROUGH THE FORECAST PERIOD. && .DISCUSSION...WATER VAPOR LOOP AND LIGHTNING DETECTION SHOWS ACTIVITY DEVELOPING ALONG THE DRY/MOIST AIR INTERFACE AS EXPECTED. FIRST STRIKES OCCURRED JUST NORTH OF ALPINE IN THE RIM COUNTRY. LATEST DETECTION OF STRIKES ALONG WITH RADAR IMAGERY SHOWS STORMS DEVELOPING A BIT FARTHER EAST AND SOUTH IN NEW MEXICO...NORTHWEST CHIHUAHUA MEXICO AND IN SOUTHEAST ARIZONA NEAR THE CHIRICAHUA NATIONAL MONUMENT. ACTIVITY FOR THIS AFTERNOON AND INTO THE EVENING HOURS SHOULD BE CONFINED MAINLY TO AREAS EAST OF A LINE FROM VAMORI IN THE TOHONO OODHAM NATION TO TUCSON AND NORTHEAST INTO THE RIM COUNTRY EAST OF THE SAN CARLOS RESERVOIR. MODELS ALL IN PRETTY GOOD AGREEMENT IN BRINGING A VORT CENTER UP THROUGH ARIZONA LATE WEDNESDAY. WATER VAPOR LOOP OVER SHOWS A HIGH CENTER OVER CENTRAL TEXAS WITH DISTINCT VORT LOBES SEEN ROTATING AROUND THE HIGH LIKE SPOKES ON A WHEEL. THE FIRST SUCH SYSTEM CURRENTLY IN MEXICO WILL AFFECT US TOMORROW WITH GRIDS AND ZONES REFLECTING A SLIGHT INCREASE IN RAIN CHANCES AS THE HIGH SHIFTS WEST TO NEW MEXICO. BY THURSDAY THE HIGH SHOULD SHIFT TO THE SOUTH A BIT...RESIDING OVER SOUTHERN NEW MEXICO. BY LATE FRIDAY THE GFS SHOWS THE HIGH RETROGRADING TO A POSITION NEAR THE CORNER OF SOUTHEAST ARIZONA/SOUTHWEST NEW MEXICO AND WILL MEANDER IN THIS VICINITY THROUGH THE WEEKEND. BY THE EARLY PORTION OF NEXT WEEK THE GFS SHOWS THE HIGH CENTERED TO THE NORTHWEST OF TUCSON...GENERALLY NORTHERN ARIZONA OR PERHAPS NEAR THE GREAT BASIN. THE FLOW PATTERN THAT THIS WOULD SET UP FOR THE WEEKEND WOULD SUGGEST A DECREASE IN THE THREAT FOR SHOWERS/THUNDERSTORMS...BUT AS THE HIGH MOVES BACK TO THE NORTH AND WEST THE FLOW AROUND THE HIGH SHOULD BECOME MORE NORTHEASTERLY WITH STORMS DEVELOPING OVER THE RIM AND DROPPING SOUTHWEST INTO VALLEY LOCATIONS. FOR THE TIME BEING HAVE HELD OFF IN DECREASING POPS DRAMATICALLY DURING THE WEEKEND SINCE THE GFS MEX ENSEMBLE MEMBERS ALL KEEP POP VALUES IN THE 30-40ISH PERCENT RANGE AS OPPOSED TO THE 20ISH PERCENT CHANCES AS INDICATED IN THE OPERATIONAL MEX MOS GUIDANCE. SO...THE BOTTOM LINE IS A SLIGHT UPSWING IN POPS FOR TOMORROW...THEN A STATUS QUO THROUGH THE REMAINDER OF THE FORECAST PERIOD. COULD SEE A SLIGHT DECREASE DURING THE WEEKEND...BUT DUE TO THE UNCERTAINTY INVOLVED WILL HOLD OFF ON THIS IDEA FOR NOW. MAX TEMPS WILL GENERALLY HOVER AROUND THE 100 DEGREE MARK FOR THE SOUTH CENTRAL DESERTS (TUCSON METRO) THROUGH DAY 7. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. MOLLERE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1130 AM MST TUE AUG 3 2004 AZZ019-029>035-040700- 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- 1130 AM MST TUE AUG 3 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ARIZONA .DAY ONE...TODAY SYNOPSIS...AN AREA OF HIGH PRESSURE WHICH IS CENTERED OVER TEXAS WILL PROVIDE SOUTHEAST ARIZONA WITH A MOIST SOUTHERLY FLOW AGAIN TODAY. THE POTENTIAL FOR HEAVY RAINFALL AND THE POTENTIAL FOR STRONG WINDS IS NEAR NORMAL. DISCUSSION...THE 12Z KTUS SOUNDING SHOWED A VERY MOIST ATMOSPHERE WITH A PRECIPITABLE WATER VALUE OF 1.43 INCHES...COMPARED TO YESTERDAYS VALUE OF 1.70. THE WATER VAPOR SATELLITE IMAGERY SHOWS SOME DRY AIR PROTRUDING INTO THE WESTERN HALF OF THE STATE WHILE THE EASTERN HALF...INCLUDING THE TUCSON AREA...REMAINS MOIST. WE WILL HAVE PLENTY OF HEATING TODAY TO HELP TRIGGER THUNDERSTORMS. WEAK 700 MB WINDS AGAIN TODAY...SO THUNDERSTORMS COULD HAVE A HARD TIME PUSHING OFF THE MOUNTAINS. STORMS THAT DO DEVELOP THIS AFTERNOON AND THIS EVENING WILL HAVE PERIODS OF HEAVY RAINFALL. THESE STORMS ALSO HAVE THE POSSIBILITY OF PRODUCING DAMAGING DOWNBURST WINDS. INITIAL DEVELOPMENT IS EXPECTED IN COCHISE...GRAHAM...AND GREENLEE COUNTIES...MAINLY NEAR THE MOUNTAINS. STORMS COULD MOVE INTO THE VALLEYS LATE THIS AFTERNOON OR THIS EVENING. STORM MOVEMENT SHOULD BE 10 MPH OR LESS TO THE NORTHWEST. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY. AN UPPER LEVEL DISTURBANCE WILL MOVE THROUGH ARIZONA WEDNESDAY FOR A MORE FAVORABLE CHANCE OF SHOWERS AND THUNDERSTORMS. THE AREA OF HIGH PRESSURE WILL REMAIN OVER TEXAS THROUGH MOST OF THE WEEK...AND THEN MOVE WESTWARD INTO NORTHERN ARIZONA THIS WEEKEND. THIS COULD CUT OFF THE MOISTURE FLOW INTO OUR AREA...HOWEVER RESIDUAL MOISTURE WILL ALLOW FOR ISOLATED THUNDERSTORMS THROUGH EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. ELSLAGER
The Tucson radar (KEMX), 112 km away, was scanning. The volume nearest the first event began at 01:29 UTC.
1 flash flood. Local standard time, as filed.
High water in the Canada Del Oro wash caused several low lying roads to be flooded. A vehicle was stuck in one of these low lying areas due to the high water.
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: 5419930.