2 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 2 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 15, 9:25 AM MST, 4 hours 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 925 AM MST SUN AUG 15 2004 SOUTHEAST ARIZONA FORECAST DISCUSSION .SYNOPSIS...AN UPPER LEVEL DISTURBANCE WILL ENHANCE THUNDERSTORM ACTIVITY TODAY. RELATIVELY DRIER CONDITIONS ARE EXPECTED LATER IN THE WEEK AS THE UPPER HIGH SHIFTS INTO A LESS FAVORABLE POSITION. HOWEVER...THERE WILL STILL BE ENOUGH MOISTURE FOR ISOLATED THUNDERSTORMS OVER MAINLY HIGHER TERRAIN. && .DISCUSSION...12Z KTUS SOUNDING STILL ON THE COOL SIDE FOR MUCH ON THE LOWER LEVELS (NOT MUCH CHANGE IN 24 HR TRENDS). MORE SUNSHINE AROUND TODAY SHOULD HELP FIX THAT. CIRCULATION STILL HANGING IN JUST NORTH TO NORTHEAST OF TUCSON...SHOULD HELP FOCUS STORMS OVER THE RIM. THIS CIRCULATION PART OF A LARGER FEATURE STRETCHING FROM CENTRAL NEW MEXICO THROUGH MUCH OF THE STATE AND INTO SOUTHERN NEVADA. EARLY RIM OUTFLOW WILL BE A THREAT BUT ON THE SOUTH SIDE OF THE CIRCULATION WE HAVE A RATHER BRISK WEST TO NORTHWEST FLOW FOR IT TO FIGHT THROUGH. LOTS OF FACTORS IN THE MIX TODAY...BUT OVERALL WE SHOULD BE ABLE TO FIRE SOUTH OF THIS FEATURE WITH A BETTER MIX OF HEATING...MOISTURE AND INSTABILITY THAN YESTERDAYS WORKED-OVER ATMOSPHERE. OUR MAIN EMPHASIS FOR ORGANIZATION MAY BE NEAR AND NORTH OF THE CIRCULATION (EXPECTED TO FILL A LITTLE AND LIFT SLOWLY NORTHWARD OVER THE NEXT 48 HOURS)...WHEREAS THE REST OF SOUTHEAST ARIZONA SEES TYPICAL MOUNTAIN DEVELOPMENT FOLLOWED BY SCATTERED VALLEY COVERAGE AFTER MID AFTERNOON INTO EVENING HOURS. SHOULD BE ABLE TO SUPPORT ISOLATED COVERAGE OVERNIGHT ONCE AGAIN. LOCALLY HEAVY RAIN REMAINS A CONCERN. COMPLEX PATTERN STILL HINTING AT DEEPEST MOISTURE BEING SHUNTED OUT OF THE WAY LATER IN THE WEEK AS THE RIDGE REORIENTS AND THEN BREAKS DOWN IN SOME MEDIUM RANGE RESOLUTIONS. POINTS TOWARD A SLOW OVERALL DRYING TREND...BUT NOT NEARLY ENOUGH TO SCOUR US OUT. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. MEYER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1155 AM MST SUN AUG 15 2004 AZZ029-031-033-034-160345- SOUTHEAST PINAL COUNTY-TUCSON METRO/MARANA/GREEN VALLEY- SANTA CRUZ COUNTY-WESTERN PIMA COUNTY- 1155 AM MST SUN AUG 15 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST PINAL... THE EASTERN THIRD AND WESTERN QUARTER OF PIMA AND SANTA CRUZ COUNTIES IN SOUTHEAST ARIZONA. ...FLASH FLOOD WATCH IN EFFECT FROM 100 PM MST TO 1100 PM MST SUNDAY... .DAY ONE...TODAY SYNOPSIS...A FLASH FLOOD WATCH IS IN EFFECT FROM 1 PM TO 11 PM TODAY. AMPLE MOISTURE AND MID LEVEL FORCING WILL CONTINUE THE POSSIBILITY OF SHOWERS AND THUNDERSTORMS TODAY... WITH THE MAIN THREAT BEING HEAVY RAINFALL. HOWEVER... A FEW THUNDERSTORMS MAY PRODUCE DAMAGING WINDS AND HAIL. DISCUSSION...A HIGH PRESSURE RIDGE REMAINS POSTED OVER ARIZONA AS A WEAK DISTURBANCE WITHIN THE RIDGE SPINS OVER GRAHAM COUNTY. AT 11 THIS MORNING THE SKY WAS MOSTLY SUNNY HELPING TO DESTABILIZE THE LOWER ATMOSPHERE... A MUST FOR REBUILDING THE BOUNDARY LAYER SINCE LITTLE RECOVERY FROM FRIDAY/S DEEP MIXING OF THE LOWER TO MID ATMOSPHERE HAS OCCURRED. PLENTY OF MOISTURE RESIDES OVER THE REGION WITH PRECIPITABLE WATER VALUES NEAR 1.50 INCHES... MAKING THE BIGGEST THREAT FOR TODAY HEAVY RAIN. ALSO... ADDITIONAL DYNAMICS WILL BE ENTERING THE AREA AS THE UPPER LEVEL JET MAX PASSES OVER THE NORTHERN GULF OF CALIFORNIA LATER TODAY ENHANCING THE UPWARD MOVEMENT. WITH THE COMBINATION OF FORCING AND THE AMOUNT OF MOISTURE AVAILABLE THERE IS A POTENTIAL FOR THUNDERSTORMS TO NOT ONLY PRODUCE HEAVY RAIN BUT DAMAGING WINDS AND HAIL. STORM MOVEMENT WILL BE TO THE EAST AT 5 TO 10 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THE HIGH PRESSURE RIDGE CURRENTLY OVER ARIZONA WILL BEGIN TO WEAKEN AS THE NEW WEEK BEGINS. THIS SHOULD DECREASE THE MOISTURE TAP REDUCING THE POTENTIAL OF SHOWERS AND THUNDERSTORMS. HOWEVER... A COMPLEX PATTERN HAS EMERGED AND DETAILS OF HOW MUCH THE RIDGE WILL WEAKEN IS UNCERTAIN. THEREFORE... WILL TREND THE POSSIBILITY OF PRECIPITATION DOWNWARD INTO THE WEEKEND. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ032-160345- TOHONO OODHAM NATION- 1155 AM MST SUN AUG 15 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PIMA COUNTY IN SOUTHEAST ARIZONA ...SMALL STREAM FLOOD WARNING IN EFFECT UNTIL 845 PM MST SUNDAY... ...FLASH FLOOD WATCH IN EFFECT FROM 100 PM MST TO 1100 PM MST SUNDAY... .DAY ONE...TODAY SYNOPSIS...A SMALL STREAM FLOOD WARNING IS IN EFFECT UNTIL 845 TONIGHT DUE TO RUN-OFF FROM YESTERDAY/S HEAVY RAIN OVER SOUTH-CENTRAL PIMA COUNTY. ALSO... A FLASH FLOOD WATCH IS IN EFFECT FROM 1 PM UNTIL 11 PM TODAY. OTHERWISE... AMPLE MOISTURE AND MID LEVEL FORCING WILL CONTINUE THE POSSIBILITY OF SHOWERS AND THUNDERSTORMS TODAY... WITH THE MAIN THREAT BEING HEAVY RAINFALL. HOWEVER... A FEW THUNDERSTORMS MAY PRODUCE DAMAGING WINDS AND HAIL. DISCUSSION...A HIGH PRESSURE RIDGE REMAINS POSTED OVER ARIZONA AS A WEAK DISTURBANCE WITHIN THE RIDGE SPINS OVER GRAHAM COUNTY. AT 11 THIS MORNING THE SKY WAS MOSTLY SUNNY HELPING TO DESTABILIZE THE LOWER ATMOSPHERE... A MUST FOR REBUILDING THE BOUNDARY LAYER SINCE LITTLE RECOVERY FROM FRIDAY/S DEEP MIXING OF THE LOWER TO MID ATMOSPHERE HAS OCCURRED. PLENTY OF MOISTURE RESIDES OVER THE REGION WITH PRECIPITABLE WATER VALUES NEAR 1.50 INCHES... MAKING THE BIGGEST THREAT FOR TODAY HEAVY RAIN. ALSO... ADDITIONAL DYNAMICS WILL BE ENTERING THE AREA AS THE UPPER LEVEL JET MAX PASSES OVER THE NORTHERN GULF OF CALIFORNIA LATER TODAY ENHANCING THE UPWARD MOVEMENT. WITH THE COMBINATION OF FORCING AND THE AMOUNT OF MOISTURE AVAILABLE THERE IS A POTENTIAL FOR THUNDERSTORMS TO NOT ONLY PRODUCE HEAVY RAIN BUT DAMAGING WINDS AND HAIL. STORM MOVEMENT WILL BE TO THE EAST AT 5 TO 10 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THE HIGH PRESSURE RIDGE CURRENTLY OVER ARIZONA WILL BEGIN TO WEAKEN AS THE NEW WEEK BEGINS. THIS SHOULD DECREASE THE MOISTURE TAP REDUCING THE POTENTIAL OF SHOWERS AND THUNDERSTORMS. HOWEVER... A COMPLEX PATTERN HAS EMERGED AND DETAILS OF HOW MUCH THE RIDGE WILL WEAKEN IS UNCERTAIN. THEREFORE... WILL TREND THE POSSIBILITY OF PRECIPITATION DOWNWARD INTO THE WEEKEND. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ019-030-035-160345- NORTHERN GREENLEE COUNTY-UPPER GILA RIVER VALLEY-COCHISE COUNTY- 1155 AM MST SUN AUG 15 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR GREENLEE... GRAHAM AND COCHISE COUNTIES IN SOUTHEAST ARIZONA. .DAY ONE...TODAY SYNOPSIS...AMPLE MOISTURE AND MID LEVEL FORCING WILL CONTINUE THE POSSIBILITY OF SHOWERS AND THUNDERSTORMS TODAY... WITH THE MAIN THREAT BEING HEAVY RAINFALL. HOWEVER... A FEW THUNDERSTORMS MAY PRODUCE DAMAGING WINDS AND HAIL. DISCUSSION...A HIGH PRESSURE RIDGE REMAINS POSTED OVER ARIZONA AS A WEAK DISTURBANCE WITHIN THE RIDGE SPINS OVER GRAHAM COUNTY. THIS HAS ALLOWED MOSTLY CLOUDY CONDITIONS TO REMAIN OVER GRAHAM... GREENLEE AND COCHISE COUNTIES. ELSEWHERE... AT 11 AM THE SKY WAS MOSTLY SUNNY HELPING TO DESTABILIZE THE LOWER ATMOSPHERE... A MUST FOR REBUILDING THE BOUNDARY LAYER SINCE LITTLE RECOVERY FROM FRIDAY/S DEEP MIXING OF THE LOWER TO MID ATMOSPHERE HAS OCCURRED. PLENTY OF MOISTURE RESIDES OVER THE REGION WITH PRECIPITABLE WATER VALUES NEAR 1.50 INCHES... MAKING THE BIGGEST THREAT FOR TODAY HEAVY RAIN. ALSO... ADDITIONAL DYNAMICS WILL BE ENTERING THE AREA AS THE UPPER LEVEL JET MAX PASSES OVER THE NORTHERN GULF OF CALIFORNIA LATER TODAY ENHANCING THE UPWARD MOVEMENT. WITH THE COMBINATION OF FORCING AND THE AMOUNT OF MOISTURE AVAILABLE THERE IS A POTENTIAL FOR THUNDERSTORMS TO NOT ONLY PRODUCE HEAVY RAIN BUT DAMAGING WINDS AND HAIL. STORM MOVEMENT WILL BE TO THE EAST AT 5 TO 10 MPH... EXCEPT FOR GREENLEE AND NORTHERN GRAHAM COUNTIES WHERE MOVEMENT TO THE NORTHWEST TO WEST IS EXPECTED DUE TO THE LOCATION OF THE IMPULSE MENTIONED EARLIER. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THE HIGH PRESSURE RIDGE CURRENTLY OVER ARIZONA WILL BEGIN TO WEAKEN AS THE NEW WEEK BEGINS. THIS SHOULD DECREASE THE MOISTURE TAP REDUCING THE POTENTIAL OF SHOWERS AND THUNDERSTORMS. HOWEVER... A COMPLEX PATTERN HAS EMERGED AND DETAILS OF HOW MUCH THE RIDGE WILL WEAKEN IS UNCERTAIN. THEREFORE... WILL TREND THE POSSIBILITY OF PRECIPITATION DOWNWARD INTO THE WEEKEND. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. EVANS
The Tucson radar (KEMX), 46 km away, was scanning. The volume nearest the first event began at 20:28 UTC.
2 flash flood. Local standard time, as filed.
Several streets in the town of Rio Rico were closed due to high water making them impassable.
Arizona Department of Transportation reported that due to flooding portions of Highway 191 had been damaged and were closed.
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: 5418619, 5418620.