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 5, 2:00 PM MST, 4 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 200 PM MST THU AUG 5 2004 SOUTHEAST ARIZONA FORECAST DISCUSSION .SYNOPSIS...HIGH PRESSURE TO OUR EAST WILL MAINTAIN A MOIST SOUTHERLY FLOW ACROSS SOUTHERN ARIZONA FOR THE NEXT COUPLE OF DAYS...WHICH WILL LEAD TO A CHANCE OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. THE UPPER LEVEL HIGH IS FORECASTED TO SHIFT TOWARD SOUTHEAST ARIZONA BY EARLY NEXT WEEK...WHICH MAY DECREASE SHOWER AND THUNDERSTORM ACTIVITY THROUGH MID WEEK. && .DISCUSSION...PARTLY CLOUDY SKIES ACROSS SOUTHERN ARIZONA THIS AFTERNOON SEEN IN VIS IMAGERY. A LINE OF LIGHT SHOWERS CONTINUES TO MOVE NORTHEAST ALONG A LINE FROM NOGALES TO SAFFORD AND WHITE MOUNTAINS. ALSO SOME WEAK REFLECTIVITY ECHOES OVER CENTRAL PIMA AND SOUTHEAST PINAL COUNTY SEEN FROM KEMX RADAR. THE STRONGER THUNDERSTORMS HAVE DEVELOPED OVER THE MOGOLLON RIM IN FLG AND PHX CWAS. AS MENTIONED IN PREVIOUS DISCUSSION...THICKER CLOUD COVER THIS MORNING LIMITED DAYTIME HEATING. CURRENT TEMPERATURES ACROSS CWA ARE COMPARABLE TO YESTERDAY AT THIS TIME. NOGALES WILL BE A BIT COOLER THAN FORECASTED SINCE IT STARTED TO RAIN ONCE AGAIN IN THE PAST HOUR. ALTHOUGH WITH THE LATE HEATING...STILL EXPECT SOME ISOLATED SHOWER AND THUNDERSTORM DEVELOPMENT OUT WEST AND ALREADY SOME THUNDERSTORMS DEVELOPING IN MEXICO SOUTHEAST OF DOUGLAS. MAIN CONCERN TONIGHT WILL BE IF AN MCS DEVELOPS NEAR THE ARIZONA AND NEW MEXICO BORDER AND PUSHES ANY OUTFLOWS NORTHWARD. THIS COULD POSSIBLY LEAD TO SOME LATE EVENING DEVELOPMENT...BUT WILL JUST KEEP CURRENT POPS WITH ISOLATED WEST AND SCATTERED EAST. OVER THE NEXT COUPLE DAYS THE HIGH WILL SLOWLY SHIFT EASTWARD TOWARD THE SOUTHERN PORTIONS OF ARIZONA AND NEW MEXICO BORDER. THIS POSITION IS TYPICALLY AN UNFAVORABLE LOCATION FOR WIDESPREAD AFTERNOON AND EVENING DEVELOPMENT. HOWEVER...THERE COULD BE SOME ISOLATED STORMS OVER THE MOUNTAINS OR ANY DEVELOPMENT DUE TO OUTFLOW FROM STRONGER MCS. GFS SHOWS A DECENT VORT MAX AT 500MB ROTATING AROUND THE HIGH ON SATURDAY EVENING AND DEVELOPING A RATHER LARGE MCS IN NORTHERN MEXICO. KEPT MAINLY SLIGHT CHANCE WORDING OVER MUCH OF CWA WITH CHANCE WORDING MAINLY OVER THE WHITE MOUNTAINS AND SOUTH ALONG THE ARIZONA AND MEXICO BORDER. LATEST GFS RUN SHOWS A RATHER LARGE CHANGE BY WEDNESDAY NIGHT...WITH A LARGE MCS DEVELOPING AND PUSHING MOISTURE NORTHWARD. THE 700MB CHANGES TO STRONGER SOUTHERLY FLOW AT 25 KNOTS...PUMPING MOISTURE INTO THE LOWER DESERTS. THE 850MB IS WEAKER AT 10 KNOTS BUT STILL HAS SOUTHERLY COMPONENT. THIS COULD INCREASE THUNDERSTORM ACTIVITY AS EARLY AS WEDNESDAY NIGHT...DEPENDING UPON THE MOISTURE ADVECTION. HOWEVER...THERE WAS A LOT OF MID AND UPPER LEVEL MOISTURE ADVECTED NORTHWARD THE PAST TWO DAYS IN WHICH CLOUD COVER HAS LIMITED THE DAYTIME HEATING. HAVE ONLY SHOWN A SLIGHT UPSWING IN POPS ACROSS THE CWA ON WEDNESDAY AND THURSDAY. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. MG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1145 AM MST THU AUG 5 2004 AZZ019-029>035-060700- 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- 1145 AM MST THU AUG 5 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ARIZONA .DAY ONE...TODAY SYNOPSIS...HIGH PRESSURE THAT IS STILL LINGERING TO THE EAST OF ARIZONA WILL CONTINUE TO BRING A MOIST SOUTHERLY FLOW TO OUR AREA. WEAK UPPER LEVEL DISTURBANCES WILL MOVE ACROSS ARIZONA DURING THE DAY WHICH WILL HELP TO ENHANCING SHOWER AND THUNDERSTORM ACTIVITY. THE POTENTIAL FOR HEAVY RAINFALL AND FOR HIGH WINDS IS NEAR NORMAL FOR TODAY. DISCUSSION...A LAYER OF RATHER THICK MID TO HIGH LEVEL CLOUDINESS PERSISTS ACROSS ARIZONA THIS AFTERNOON. OVERNIGHT AND CONTINUING THIS AFTERNOON RADARS ARE DETECTING LIGHT TO MODERATE MOSTLY SHOWERS ACROSS MAINLY EASTERN PORTIONS OF THE FORECAST AREA. AS OF 1130 AM THE ACTIVITY EXTENDED FROM NEAR THE NOGALES AREA...THEN NORTHEAST TO NEAR WILLCOX AND THEN INTO THE WHITE MOUNTAINS NORTH OF CLIFTON. THIS MORNINGS TUCSON UPPER AIR SOUNDING WAS NOT TOO IMPRESSIVE WITH THE PRECIPITABLE WATER VALUE AT 1.28 INCHES WHICH IS DOWN FROM THE 1.57 INCHES FROM THE PREVIOUS MORNING. IN ADDITION...THE AIRMASS WARMED SLIGHTLY IN THE MID LEVELS WHICH HAS RESULTED IN SOMEWHAT OF A STABILIZATION OF THE ATMOSPHERE WITH THE LIFTED INDEX ONLY MARGINAL AT ABOUT MINUS 1. MODIFYING THE SOUNDING YIELDED RESULTS WHICH WERE NOT MUCH DIFFERENT THAN THE UNMODIFIED SOUNDING WITH A CAPE OF AROUND 200-300 J/KG. THE ONE FLY IN THE OINTMENT IS THAT THE GUAYMAS MEXICO SOUNDING AT 16Z THIS MORNING REVEALED A MUCH DIFFERENT STORY WITH A VERY MOIST SOUNDING...PRECIPITABLE WATER IN EXCESS OF 2 INCHES...A LIFTED INDEX OF MINUS 7 AND AN UNMODIFIED CAPE OF OVER 4000 J/KG. THEREFORE...IF A LARGE STORM COMPLEX DEVELOPS OVER NORTH CENTRAL MEXICO THIS AFTERNOON AND EVENING IT COULD HELP TO PUSH OUTFLOW BOUNDARIES INTO SOUTHEAST ARIZONA WHICH WOULD AID IN THE DEVELOP OF STORMS LOCALLY. FOR THIS AFTERNOON EXPECT TO SEE ONGOING SCATTERED CONVECTION IN PORTIONS OF GREENLEE...GRAHAM AND COCHISE COUNTIES. AS THE AFTERNOON PROGRESS THE THUNDERSTORM ACTIVITY SHOULD BECOME MORE WIDESPREAD OVER EASTERN AREAS...SPECIFICALLY AREAS BETWEEN TUCSON AND THE NEW MEXICO BORDER. ACTIVITY SHOULD DEVELOP INITIALLY ALONG THE INTERNATIONAL BORDER... NEAR THE DOUGLAS AREA. THIS IS DUE TO MUCH LESS CLOUD COVER WHICH WILL ALLOW FOR PLENTY OF HEATING...ALONG WITH A MORE UNSTABLE AIRMASS IN THIS AREA. FARTHER TO THE WEST ACROSS THE CENTRAL DESERTS TO NEAR AJO THE THUNDERSTORM DEVELOPMENT SHOULD BE MOSTLY ISOLATED IN NATURE. STORMS THAT DO DEVELOP THIS AFTERNOON AND EVENING ARE EXPECTED TO PRODUCE MODERATE TO HEAVY RAINFALL AT TIMES...FROM A HALF INCH TO THREE QUARTERS OF AN INCH PER HOUR. THESE STORMS ALSO HAVE THE POTENTIAL TO PRODUCE SOME GUSTY WINDS. MOVEMENT OF THE STORMS THIS AFTERNOON AND EVENING WILL BE TO THE NORTHEAST AT 10 TO 15 MPH. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH THURSDAY. THE POSITION OF THE HIGH PRESSURE SYSTEM WILL DETERMINE THE FORECAST AFTER FRIDAY. RECENT MODEL RUNS HAVE THE HIGH MOVING OVER SOUTHERN ARIZONA AND NEW MEXICO...CUTTING US OFF FROM OUR MOISTURE FLOW...AND HENCE DECREASING THUNDERSTORM ACTIVITY. HOWEVER...THERE COULD STILL BE ENOUGH RESIDUAL MOISTURE IN ARIZONA IF OUTFLOW FROM STORMS IN MEXICO OVER THE NEXT COUPLE OF DAYS PUSHES INTO THE REGION. THIS WOULD ALLOW A CONTINUATION OF ISOLATED TO SCATTERED STORMS TO DEVELOP THROUGHOUT THE WEEK. WE SHOULD HAVE A BETTER FEEL FOR THIS LATER IN THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MOLLERE
The Tucson radar (KEMX), 46 km away, was scanning. The volume nearest the first event began at 01:28 UTC.
1 flash flood. Local standard time, as filed.
Heavy rainfall in Patagonia caused the streets to flood and the garage of the fire station to be flooded. There was not property damage, however the streets where impassable throughout most of the town.
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: 5419932.