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 9, 2:15 PM MST, 4 hours 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 215 PM MST MON AUG 9 2004 SOUTHEAST ARIZONA FORECAST DISCUSSION .SYNOPSIS...UPPER LEVEL HIGH PRESSURE WILL BE CENTERED OVER ARIZONA THROUGH WEDNESDAY WHICH WILL TEND TO KEEP THE MOST THUNDERSTORM COVERAGE ACROSS SOUTHEAST ARIZONA. AN UPPER LEVEL DISTURBANCE APPROACHING FROM MEXICO IS EXPECTED TO PROVIDE AN INCREASE IN SHOWERS AND THUNDERSTORMS LATER THIS WEEK. && .DISCUSSION...KEMX WSR-88D DETECTED SCATTERED MOSTLY LESS THAN 40 DBZ ECHOES NEAR THE MOUNTAINS OF GREENLEE/GRAHAM/COCHISE COUNTIES AT 2110Z. ISOLATED CELLS WERE ENCROACHING UPON FAR SE PINAL/ERN PIMA/ERN SANTA CRUZ COUNTIES. THE REST OF SE AZ WAS VOID OF PRECIP ECHOES. DEWPOINTS WERE IN THE UPPER 40S-MID 50S F WHICH WERE NEARLY IDENTICAL TO THIS TIME SUNDAY. SHOWERS AND THUNDERSTORMS DEVELOPED THIS AFTERNOON NEAR THE ERN MOUNTAINS WHERE ABUNDANT SUNSHINE PREVAILED EARLIER THIS MORNING AND CONTINUED TO DEVELOP JUST NE OF THIS FORECAST AREA ALONG THE MOGOLLON RIM. GIVEN EXTENT OF MID/HIGH LEVEL CLOUD COVER FAR WRN PIMA COUNTY SHOULD BE THE LEAST LIKELY AREA TO HAVE CONVECTIVE DEVELOPMENT LATER THIS AFTERNOON/EVENING. THUS MAIN CONVECTIVE POTENTIAL TO BE ACROSS ERN SECTIONS DURING THE NEXT 2-4 HOURS WITH CELLS MOVING/PROPAGATING SLOWLY WSWWD. BELIEVE BULK OF ACTIVITY WILL BE MAINLY NEAR MOUNTAINS AND ISOLATED HEAVY RAIN PRODUCERS WILL OCCUR. GIVEN LACK OF A DISCERNABLE UPWARD FORCING MECHANISM BELIEVE MAJORITY OF CELLS WILL DISSIPATE BY MIDNIGHT. STATUS QUO TUE AND WED AS THE UPPER HIGH REMAINS JUST NORTH OF THIS FORECAST AREA. INHERITED FORECASTS INDICATED UPSWING IN THUNDERSTORM POTENTIAL THUR AND FRI. HOWEVER HAVE NOTED THE GFS SOLUTION DEPICTION OF UPPER HIGH MOVING SWD LATER THIS WEEK WITH MID-LEVEL STEERING FLOW BECOMING SWLY AT LEAST ACROSS WRN LOCALES. STILL THIS SAME NUMERICAL MODEL DEPICTED A FAIRLY DECENT MOISTURE INCREASE ALONG WITH SYNOPTIC-SCALE ASCENT VIA OMEGA FIELDS LATE THUR AND FRI. GIVEN CONSIDERABLE UNCERTAINTY WITH REGARD TO THIS SOLUTION HAVE OPTED TO MAINTAIN INHERITED FORECASTS OF SCATTERED MAINLY AFTERNOON AND EVENING SHOWERS/THUNDERSTORMS THUR AND FRI. DOUBT THAT BOTH DAYS WOULD HAVE SIMILAR COVERAGE THOUGH AND THAT IN REALITY ONE DAY WOULD BE FAVORED OVER THE OTHER DAY. WILL ALSO CONTINUE TREND OF DECREASED ACTIVITY DURING THE WEEKEND INTO EARLY NEXT WEEK AS UPPER HIGH PROGGED WELL S OVER MEXICO. QUITE WARM TUE AND WED. ASSUMING INCREASED MOISTURE SCENARIO THEN A DECREASE IN DAYTIME MAX TEMPS STARTING THUR WITH DAYTIME MAX TEMPS THUR AND FRI TRENDING CLOSE TO OR SLIGHTLY BELOW SEASONAL NORMALS FOR MID-AUGUST. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. BF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1230 PM MST MON AUG 9 2004 AZZ019-029>035-100700- 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- 1230 PM MST MON AUG 9 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ARIZONA .DAY ONE...TODAY SYNOPSIS...A SLIGHTLY DRIER AIRMASS NEAR THE SURFACE WILL RESULT IN A MARGINAL RISK OF DAMAGING DOWNBURST WINDS FROM STORMS THAT DEVELOP LATER TODAY. HIGH PRESSURE CENTERED OVER NORTHERN ARIZONA COMBINED WITH TWO WEATHER FEATURES OVER MEXICO...WILL PLACE THE BEST CHANCE OF THUNDERSTORMS CLOSER TO THE INTERNATIONAL BORDER THIS AFTERNOON AND EVENING. DISCUSSION...THICKER CLOUD COVER ACROSS MAJORITY OF SOUTHERN ARIZONA IS SLOWLY DISSIPATING. CURRENT VIS SATELLITE IMAGERY SHOWING MAINLY WESTERN PORTIONS OF CWA UNDER THICKER MID AND UPPER LEVEL CLOUDS. THIS MAY LIMIT SOME OF THE THUNDERSTORM DEVELOPMENT ACROSS THIS AREA THIS AFTERNOON AND EVENING. HOWEVER...IF IT CONTINUES TO CLEAR OUT COULD SEE SOME ISOLATED THUNDERSTORMS DEVELOPING LATER IN THE AFTERNOON. LATEST SATELLITE IMAGERY ALREADY SHOWING THUNDERSTORMS DEVELOPING OVER THE EASTERN AND WHITE MOUNTAINS. GOES PRECIPITABLE WATER VALUES INDICATING A SLIGHTLY DRIER ATMOSPHERE WITH PW NEAR INCH TO NORTHERN AND 1.5 IN SOUTHERN ARIZONA. SHOULD BE ABLE TO PRODUCE RAINFALL AMOUNTS OF 0.25 TO 0.5 INCHES IN THE HIGHER TERRAIN. THE PHOENIX SOUNDING AT 18Z SHOWED WINDS FROM THE EAST AT 10 KNOTS. WINDS SHOULD BE STRONG ENOUGH TO MOVE OFF MOUNTAINS. VALLEY AREAS...MAINLY EAST OF TUCSON...COULD SEE RAINFALL AMOUNTS OF 0.05 TO 0.25 INCHES. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SUNDAY. THE RISK OF THUNDERSTORMS IS EXPECTED TO DIMINISH SOMEWHAT THROUGH MID WEEK WITH THE DRIER AIR IN PLACE AND HIGH PRESSURE CENTERED RIGHT OVER THE STATE. HOWEVER...THERE WILL STILL BE SUFFICIENT MOISTURE STUCK OVER THE REGION...SO MAINLY ISOLATED AND SLOW-MOVING THUNDERSTORMS CAN STILL BE EXPECTED. HIGH TEMPERATURES WILL REMAIN ABOVE NORMAL AS THE HIGH STRENGTHENS A BIT. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. .
The Tucson radar (KEMX), 112 km away, was scanning. The volume nearest the first event began at 01:31 UTC.
1 flash flood. Local standard time, as filed.
Significant rainfall caused the Canada Del Oro wash to have a rapid rise in water. The Golder Ranch Fire Department reported that the water in the Canada Del Oro wash overtopped the Golder Ranch Bridge, making it impassable.
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: 5419934.