1 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it. 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 Phoenix, AZ wrote its last area forecast discussion before the first event at Jul 23, 9:39 AM MST, 5 hours 38 minutes earlier.
AZZ020>028-CAZ030>033-232245- AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 938 AM FRI JUL 23 2004 SOUTHWEST AND SOUTH-CENTRAL ARIZONA...AND SOUTHEAST CALIFORNIA FORECAST DISCUSSION .SYNOPSIS... HIGH PRESSURE ALOFT WILL MEANDER OVER ARIZONA TODAY...THEN GENERALLY BECOME CENTERED OVER NORTHERN ARIZONA THIS WEEKEND. MEANWHILE... LOW PRESSURE SYSTEMS MOVING WEST ACROSS MEXICO AND THE GULF OF CALIFORNIA WILL HELP INCREASE MOISTURE THROUGH THE WEEKEND. THUS... AN INCREASING CHANCE OF MAINLY AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS IS EXPECTED BY SATURDAY AND SUNDAY. AND...LOWER TEMPERATURES ARE EXPECTED TODAY COMPARED WITH YESTERDAY. && .DISCUSSION... STRONG HIGH PRESSURE CONTINUES IN PLACE OVER THE DESERT SOUTHWEST WITH THE 500MB HIGH CENTER NOW CLOSE TO PHOENIX...OVER CENTRAL ARIZONA. QUITE A BIT OF CLOUD COVER CAN BE SEEN OVER SRN/CNTRL AZ...MUCH OF WHICH IS DEBRIS CLOUDS THAT SPREAD INTO THE STATE FROM A DYING MCS THAT FORMED LAST NIGHT OVER NWRN MEXICO. AT 9 AM THIS MORNING THE MCS CONTINUES TO WEAKEN AND MOVE TO THE SW OVER THE SRN GULF OF CA...AND THIS SYSTEM WILL CONTINUE TO SEND MOISTURE TO THE NORTH AND UP THE LOWER CO RIVER VALLEY. A SURGE BEGAN YESTERDAY ...SPURRED BY A PREVIOUS MCS OVER MEX...AND IT WILL CONTINUE TODAY INTO TONIGHT. SURFACE DEWPOINTS IN SERN CA AND ALONG THE RIVER ARE NOW IN THE MID 60S TO MID 70S AS A RESULT OF THE SURGE...AND THE ANTYCYC GYRE WILL SPREAD THIS MOISTURE BACK TO THE EAST AND OVER THE SRN/CENTRAL DESERTS...ADDING LOW LEVEL MOISTURE TO THE AIRMASS AND INCREASING THE THREAT FOR STORMS IN THE DAYS TO COME. THE 12Z RAOB AT PHOENIX TODAY WAS SUBSTANTIALLY MORE MOIST AND UNSTABLE AS COMPARED TO THURSDAY...WITH AN 850MB DEWPOINT OF 14C. AND...SURFACE DEWPOINTS THIS MORNING IN THE PHX AREA ARE IN THE 60S FOR THE MOST PART. A LOOK AT THE WATER VAPOR IMAGERY SHOWS A PRONOUNCED DEFORMATION/STRETCHING ZONE BISECTING THE STATE FROM SW TO NE...AND THIS WEAKNESS ALOFT HELPED EXPLAIN SHOWERS THAT DEVELOPED THIS MORNING IN THE WESTERN DESERTS. MODEL WIND FORECASTS AND RAOB DATA SUGGEST THAT THE STEERING FLOW OVER SCNTRL AZ WILL BE WEAK FROM THE NW TO N TODAY...AND WITH THE STRONG INCREASE IN MOISTURE AND INSTABILITY...WILL LIKELY RAISE OUR POPS FOR THIS AFTERNOON AND EVENING TO AT LEAST 20 PERCENT...WITH HIGHER POPS OVER THE HIGHER TERRAIN. IT APPEARS THE MOST SIGNIFICANT DIFLUENCE ALOFT AND UPPER DIVERGENCE WILL STAY TO OUR SE TODAY/TONIGHT...GIVING THE TUS CWA SOME BOOST TO THEIR STORM CHANCES. FAR WESTERN DESERTS/SERN CA WILL STILL BE MOSTLY OUT OF THE WOODS...AS THE SHALLOW LAYER OF HIGH DEWPOINTS WILL MIX OUT AND THE AIRMASS WILL REMAIN TOO DRY AND STABLE FOR ANY SIGNIFICANT CONVECTION. FOR SATURDAY INTO THE WEEKEND...MODELS CONTINUE TO WANT TO SHIFT THE UPPER HIGH TO THE NORTHWEST...AND PUT IT OVER SRN NV OR NW AZ. THIS GIVES A MORE NLY TO NELY STEERING FLOW WHICH IS A GOOD DIRECTION FOR BRINGING STORMS FROM THE RIM DOWN INTO OUR DESERTS. WE SHOULD HAVE ENOUGH LOW LEVEL MOISTURE BY THE WEEKEND TO SUPPORT CONTINUED STORM DEVELOPMENT AS THEY WORK INTO OUR AREA...SO THE CHANCE POPS THAT ARE IN THE FORECAST RIGHT NOW LOOK OK. THERE IS A PRONOUNCED INVERTED TROF OVER W TEXAS/NW MEXICO THAT WILL PUSH TO THE WEST TONIGHT THROUGH SATURDAY...AND IT WILL GIVE SIGNIFICANT LIFT/DIFLUENCE ALOFT TO PART OF AZ HELPING TO INCREASE STORM CHANCES. HOWEVER IT APPEARS THAT THIS FEATURE MAY SKIRT OUR AREA TO THE SOUTHEAST FOR THE MOST PART...AND MAINLY BE A PLAYER FOR THE TUS CWA AGAIN. ONE THING OF INTEREST IN THE 12Z ETA RUN...AS THE HIGH MIGRATES TO THE NORTHWEST IT STARTS TO BUILD...WITH A 594 CENTER FORECAST BY SUNDAY AFTERNOON. IN TURN THE AIRMASS TO OUR NORTH AND WEST DRIES OUT...WITH LOW MEAN RH AND 850MB DEWPOINTS FORECAST. THUS AS WE MOVE INTO THE WEEKEND THERE MIGHT NOT BE QUITE AS MUCH CONVECTION DEVELOPING ALONG THE CENTRAL/WESTERN RIM AS WE THOUGHT...AND THUS LESS WEATHER AVAILABLE TO ADVECT SOUTHWARD WITH THE NLY/NELY STEERING FLOW. THIS WOULD THEN LIMIT THE POTENTIAL FOR STORMS IN OUR AZ ZONES SAT INTO SUNDAY. THIS WILL HAVE TO BE LOOKED AT IN MORE DETAIL WHEN THE GFS RUN FINISHES COMING IN THIS MORNING. CURRENT FORECAST FOR TODAY LOOKS PRETTY GOOD BUT MAY NEED TO UPDATE AND RAISE POPS SOMEWHAT FOR THIS AFTERNOON. .PSR WATCHES/WARNINGS/ADVISORIES... AZ...NONE. CA...NONE. && 11
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 1048 AM MST FRI JUL 23 2004 AZZ024-240500- SOUTHERN GILA/TONTO NF FOOTHILLS- 1048 AM MST FRI JUL 23 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL ARIZONA. .DAY ONE...TODAY ISOLATED TO SCATTERED THUNDERSTORMS MAY CAUSE HEAVY RAINS AND MINOR FLOODING OF POOR DRAINAGE AND LOW LYING AREAS. WASHES MAY BEGIN FLOWING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS AN CHANCE FOR THUNDERSTORMS SATURDAY THROUGH NEXT FRIDAY WITH THE BEST THREAT FOR HEAVY RAINS...FLOODING...AND GUSTY WINDS...EXPECTED SATURDAY THROUGH TUESDAY. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TODAY THROUGH THURSDAY. && FOR ADDITIONAL WEATHER INFORMATION...CHECK OUR WEB SITE AT HTTP://WWW.WRH.NOAA.GOV/PHOENIX (IN SMALL LETTERS) AZZ021>023-026>028-240500- GREATER PHOENIX AREA-NORTHWEST AND NORTH CENTRAL PINAL COUNTY- NORTHWEST MARICOPA COUNTY-SOUTHWEST DESERTS- SOUTHWEST MARICOPA COUNTY-WEST CENTRAL DESERTS- 1048 AM MST FRI JUL 23 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST AND SOUTH CENTRAL ARIZONA. .DAY ONE...TODAY THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS TODAY...BUT THEY WILL LIKELY NOT PRODUCE SEVERE WINDS...HEAVY RAIN OR FLOODING. GUSTY WINDS TO 40 MPH...ALONG WITH BRIEF HEAVY RAIN AND SOME BLOWING DUST ARE POSSIBLE WITH ANY STORMS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS AN INCREASING CHANCE FOR THUNDERSTORMS SATURDAY THROUGH TUESDAY...AND THEY MAY PRODUCE LOCALLY HEAVY RAINFALL...MINOR FLOODING OF ROADS AND WASHES...AND STRONG GUSTY WINDS LEADING TO BLOWING DUST. THE THREAT FOR THUNDERSTORMS IS EXPECTED TO DECREASE FROM THE WEST WEDNESDAY THROUGH FRIDAY. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED SATURDAY THROUGH TUESDAY. && FOR ADDITIONAL WEATHER INFORMATION...CHECK OUR WEB SITE AT HTTP://WWW.WRH.NOAA.GOV/PHOENIX (IN SMALL LETTERS) AZZ020-025-CAZ030>033-240500- IMPERIAL COUNTY-JOSHUA TREE NATIONAL PARK- LOWER COLORADO RIVER VALLEY AZ-LOWER COLORADO RIVER VALLEY CA- RIVERSIDE COUNTY/EASTERN DESERTS-YUMA/MARTINEZ LAKE AND VICINITY- 1048 AM MST FRI JUL 23 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST CALIFORNIA AND THE LOWER COLORADO RIVER VALLEY. .DAY ONE...TODAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS SATURDAY THROUGH TUESDAY...MAINLY IN THE EVENING HOURS. THEY MAY PRODUCE GUSTY WINDS TO OVER 40 MPH...ALONG WITH BRIEF HEAVY RAIN AND BLOWING DUST. THE THREAT FOR THUNDERSTORMS WILL DECREASE FROM THE WEST BEGINNING WEDNESDAY. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED SATURDAY THROUGH TUESDAY. && FOR ADDITIONAL WEATHER INFORMATION...CHECK OUR WEB SITE AT HTTP://WWW.WRH.NOAA.GOV/PHOENIX (IN SMALL LETTERS)
The Phoenix radar (KIWA), 77 km away, was scanning. The volume nearest the first event began at 22:15 UTC.
1 thunderstorm wind. Local standard time, as filed.
Ten inch diameter tree blown over onto a resident. Minor damage to a trailer door by downed electric power lines.
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, July 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: 5412925.