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 Sep 2, 1:50 PM MST, 5 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 150 PM MST THU SEP 2 2004 SOUTHEAST ARIZONA FORECAST DISCUSSION .SYNOPSIS...A TROUGH OF LOW PRESSURE WILL MOVE THROUGH THE INTERMOUNTAIN WEST MAINLY TO OUR NORTH FRIDAY AND SATURDAY...BRINGING COOLER TEMPERATURES AND BREEZES. IN ADDITION...THE WEAK REMNANTS OF A TROPICAL SYSTEM WILL INCREASE THE MOISTURE ACROSS SOUTHERN ARIZONA OVER THE WEEKEND...BRINGING A BETTER CHANCE OF SHOWERS AND THUNDERSTORMS TO THE AREA. && .DISCUSSION...HIGH OVERHEAD BREAKING DOWN AS A STRONG LOW MOVES THROUGH BRITISH COLUMBIA AND THE RESULTING TROUGH DIGS THROUGH. LATITUDE TOO HIGH TO DO MUCH THIS FAR SOUTH...BUT SOME BREEZES AND SEVERAL DEGREES OF COOLING NOT TOO MUCH TO ASK FOR. TODAYS 12Z KTUS SOUNDING HAD A STRONG CAP ABOVE THE MOISTURE (JUST ABOVE H5). THIS SEEMS TO HAVE ERODED A BIT WITH WEAK COOLING STARTING AT MID LEVELS THIS AFTERNOON. PRECIPITABLE WATER AT .92 ON THE SOUNDING WITH VALUES NEAR 1 INCH AROUND HAS BEEN ENOUGH FOR A FEW BUILDUPS...BUT MORE OF A TOPO ASSIST MAY BE NEEDED WITH THE INVERSION AND COVERAGE IS STILL EXPECTED TO BE DOWN A BIT. HOWARD WELL SOUTHWEST OF BAJA...CURRENT NHC TRACKS PUT THE WEAK REMNANTS OFF THE CENTRAL THEN NORTHERN BAJA COAST OVER THE LABOR DAY WEEKEND. BOTH STRENGTH AND TRACK TRENDS ARE QUITE REASONABLE CONSIDERING THE COOLER WATER HES MOVING INTO AND THE SPEED AT WHICH THE HIGH IS COLLAPSING UNDER THE TROUGH...HES TOO FAR SOUTH AND MOVING TOO SLOWLY TO RECURVE DRASTICALLY UNDER THE TROUGHS INFLUENCE. EVEN SO...THE RESULTING DEEPER MOISTURE PUSHING INTO NORTHWEST MEXICO ON THE EASTERN FLANK OF THE DECAYING SYSTEM WILL LIKELY BE A FACTOR FOR AT LEAST SOUTHERN ARIZONA. ENOUGH OF A MOISTURE INCREASE TO PUSH US INTO SCATTERED COVERAGE OVER THE WEEKEND WITH A MOISTURE GRADIENT FROM NORTH TO SOUTH. HIGH CENTER RECONSOLIDATING OVER NORTHWEST MEXICO BEHIND THE TROUGH BULLIES THE DEEPEST MOISTURE BACK AROUND TO THE WEST WITH THE FINAL TENUOUS REMNANTS OF THE TROPICAL SYSTEM DRAWN UP WEST OF US AND INTO THE FLOW NORTH OF US. WELL KEEP ISOLATED COVERAGE BUT NOT SURE ABOUT THINGS AFTER THE WEEKEND. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. MEYER
The Tucson radar (KEMX), 112 km away, was scanning. The volume nearest the first event began at 02:44 UTC.
1 flash flood. Local standard time, as filed.
Tohono O'ohdam sheriff dispatch reported that Route 19 was closed due to 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, September 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: 5427342.