A weak low pressure system off the western coast of Baja pulled moisture from Mexico northward into southeast Arizona. This increase in moisture lead to the development of isolated showers and thunderstorms over the eastern zones of southeast Arizona, including eastern pima county, in the afternoon and evening of June 22nd.
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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 episode as NWS TWC wrote it up.
A weak low pressure system off the western coast of Baja pulled moisture from Mexico northward into southeast Arizona. This increase in moisture lead to the development of isolated showers and thunderstorms over the eastern zones of southeast Arizona, including eastern pima county, in the afternoon and evening of June 22nd.
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 Jun 22, 1:45 PM MST, 1 hour earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 145 PM MST TUE JUN 22 2004 SOUTHEAST ARIZONA FORECAST DISCUSSION .SYNOPSIS...AN INCREASE IN MOISTURE AHEAD OF A WEAK LOW PRESSURE SYSTEM NEAR NORTHERN BAJA WILL CONTINUE TO BRING A CHANCE OF THUNDERSTORMS THE NEXT FEW DAYS. A DRIER WEST TO SOUTHWEST FLOW WILL DEVELOP LATER IN THE WEEK WITH THUNDERSTORM CHANCES ENDING BY THE WEEKEND. && .DISCUSSION...GOES SOUNDER ESTIMATES SUGGEST VALUES CLOSER TO 1 INCH THAN THE MORNING SOUNDING SHOWED. CONVECTION FIRED OVER THE MOUNTAINS EARLY...AND AFTERNOON SUGGESTING THE ABILITY TO SUPPORT SOME VALLEY STORMS INTO THE EVENING HOURS. WEAK LOW NEAR NORTHERN BAJA COMBINED WITH TEMPORARY CONSOLIDATION OF A HIGH CENTER JUST TO OUR EAST UNDER THE LARGER SCALE RIDGE WILL HELP PUSH DEEPER MOISTURE A LITTLE FURTHER WEST AND NORTH OVER THE NEXT 24 HOURS...INCREASING THE CHANCE OF CONVECTION AND SPREADING THE COVERAGE A LITTLE FURTHER WEST BY TOMORROW. WEAKNESS IN THE FLOW WILL BE TO OUR EAST BY THE WEEKEND AS A STRONGER HIGH CENTER OFF THE BAJA COAST DOMINATES OUR WEATHER WITH A DRIER WESTERLY FLOW (REINFORCED BY A TROUGH PUSHING INTO THE PACIFIC NORTHWEST. CONVECTION CONTINUING IN CENTRAL MEXICO EXTENDING UP TOWARD WEST TEXAS...BUT THE MOISTURE SHOULD PUSH BACK OUT OF SOUTHEAST ARIZONA OVER THE WEEKEND...AND OUT OF SONORA AND MUCH OF CHIHUAHUA THE FIRST HALF OF THE WEEK. && .FIRE WEATHER...MOISTURE FROM THE SOUTH WILL CONTINUE TO SEEP INTO SOUTHERN ARIZONA OVER THE NEXT SEVERAL DAYS...INCREASING RH VALUES. ISOLATED SHOWER AND THUNDERSTORM COVERAGE WILL BECOME SCATTERED AS THE MOISTURE SPREADS NORTH AND WEST INTO WEDNESDAY. GENERALLY DRY CONDITIONS ARE ONCE AGAIN EXPECTED OVER THE WEEKEND AND EARLY NEXT WEEK AS THE CENTER OF THE HIGH SHIFTS INTO AN UNFAVORABLE POSITION AND A DRY WEST TO SOUTHWEST FLOW RESUMES ACROSS ARIZONA. && .TWC WATCHES/WARNINGS/ADVISORIES...NONE. && MEYER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1130 AM MST TUE JUN 22 2004 AZZ019-029>035-231400- NORTHERN GREENLEE COUNTY-SOUTHEAST PINAL COUNTY- UPPER GILA RIVER VALLEY-WESTERN PIMA COUNTY- TOHONO OODHAM NATION-TUCSON METRO/MARANA/GREEN VALLEY- SANTA CRUZ COUNTY-COCHISE COUNTY- 1130 AM MST TUE JUN 22 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ARIZONA .DAY ONE...TODAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. SYNOPSIS...MOISTURE WILL CONTINUE TO INCREASE FROM THE SOUTH OVER THE NEXT 24 HOURS. THIS WILL LEAD TO AN INCREASE IN THUNDERSTORM COVERAGE THIS AFTERNOON AND EVENING. EVEN WITH THE INCREASE IN MOISTURE...THE LOWER ATMOSPHERE REMAINS RELATIVELY DRY...THUS THERE REMAINS A RISK OF STRONG GUSTY WINDS IN THE VICINITY OF MOST STORMS. THE PROBABILITY THAT ANY STORM WILL PRODUCE PRECIPITATION EXCEEDING ONE INCH IS LOW. DISCUSSION...COVERAGE WILL INCREASE FROM ISOLATED TO SCATTERED THIS AFTERNOON AND EVENING...AS WELL AS SPREAD FURTHER WEST AND NORTH THAN YESTERDAY. PRECIPITABLE WATER VALUES OVER 1 INCH ARE ENCROACHING FROM THE SOUTH...THUS EXPECT WETTER STORMS THAN YESTERDAY...BUT STILL BELOW WHAT ONE MIGHT EXPERIENCE LATER IN THE SEASON. THE HIGHEST RAINFALL AMOUNT RECORDED YESTERDAY WAS JUST OVER 1/2 OF AN INCH...WE COULD SEE ONE OR TWO APPROACH THE 1 INCH MARK THIS AFTERNOON AND EARLY EVENING. WITH A SHARP BOUNDARY BETWEEN THE WET AND DRY AIR EXTENDING FROM THE WHITE MOUNTAINS SOUTHWEST TO NEAR SAFFORD...TO NEAR TUCSON AND SOUTHWARD TO NEAR NOGALES...EXPECT A FEW STRONG STORMS AS WELL...POSSIBLY APPROACHING SEVERE LEVELS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. WEAK LOW NEAR NORTHERN BAJA COMBINED WITH TEMPORARY CONSOLIDATION OF A HIGH CENTER JUST TO OUR EAST UNDER THE LARGER SCALE RIDGE WILL CONTINUE TO HELP PUSH DEEPER MOISTURE A LITTLE FURTHER WEST AND NORTH WEDNESDAY...INCREASING THE CHANCE OF CONVECTION OVER MUCH OF SOUTHEAST ARIZONA. WEAKNESS IN THE FLOW WILL BE TO OUR EAST BY THE WEEKEND WITH A STRONGER HIGH CENTER OFF THE BAJA COAST DOMINATING OUR WEATHER WITH A DRIER WESTERLY FLOW...PUSHING MOISTURE OUT OF THE AREA. WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Tucson radar (KEMX), 44 km away, was scanning. The volume nearest the first event began at 21:43 UTC.
1 thunderstorm wind. Local standard time, as filed.
A microburst near the crossroads of Speedway and Pantano caused a roof to be partially torn off of a home and blown several hundred feet onto the roof of a neighboring home.
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, June 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: 5406734.