1 thunderstorm wind, as filed by the National Weather Service.
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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 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 Sep 8, 3:30 PM MST, 4 hours 16 minutes earlier.
AZZ020>028-CAZ030>033-090545- AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 330 PM MST WED SEP 8 2004 SOUTHWEST AND SOUTH-CENTRAL ARIZONA...AND SOUTHEAST CALIFORNIA FORECAST DISCUSSION .SYNOPSIS... HIGH PRESSURE WILL CONTINUE OVER THE AREA THE REST OF THE WEEK. HIGHER HUMIDITY MEANS ISOLATED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS FOR SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA THROUGH THURSDAY...THEN CONFINED TO SOUTHEAST CALIFORNIA FRIDAY. DRIER AIR FROM THE GREATER PHOENIX AREA EAST WILL GRADUALLY SPREAD WEST THROUGH FRIDAY. THEN...DRIER AIR WILL SPREAD OVER THE ENTIRE AREA BY THE WEEKEND...WITH MOSTLY CLEAR NIGHTS AND SUNNY DAYS LASTING INTO EARLY NEXT WEEK. IT WILL ALSO BE HOTTER AGAIN BY THE WEEKEND. THE SOUTHERN END OF A PACIFIC LOW PRESSURE SYSTEM WILL CAUSE TEMPERATURES TO DROP BACK EARLY NEXT WEEK. && .DISCUSSION... TEMPERATURES WERE GENERALLY 1 OR 2 DEGREES LOWER IN SOUTH-CENTRAL ARIZONA AND 3 TO 7 DEGREES LOWER IN SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA AT MID AFTERNOON TODAY COMPARED WITH THE SAME TIME YESTERDAY. DEW POINT TEMPERATURES WERE ABOUT THE SAME IN SOUTH-CENTRAL ARIZONA...AND 20 TO 35 DEGREES HIGHER IN FAR SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA COMPARED WITH THE SAME TIME YESTERDAY. WITH DRIER AIR EXPECTED TO CONTINUE IN THE GREATER PHOENIX AREA...NORTH-CENTRAL AND NORTHWEST PINAL COUNTY...AND SOUTHERN GILA COUNTY...WILL CONTINUE TO KEEP A DRY FORECAST FOR THIS AREA...WITH ISOLATED SHOWERS AND THUNDERSTORMS FROM WESTERN MARICOPA COUNTY WEST ACROSS SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA THROUGH THIS EVENING. SOME OF THE THUNDERSTORMS COULD BE SEVERE ALONG WITH BLOWING DUST AND PRODUCE LOCALLY HEAVY RAIN. ENOUGH MOISTURE IS EXPECTED TO REMAIN FOR A SLIGHT CHANCE OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS IN SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA THURSDAY...THEN CONFINED TO SOUTHEAST CALIFORNIA FRIDAY. DRY AIR WITH MOSTLY CLEAR NIGHTS AND SUNNY DAYS WILL RETURN OVER THE ENTIRE AREA BY THE WEEKEND. THE DRY AIR AND STRONG HIGH PRESSURE ALOFT WILL BRING SOMEWHAT HOTTER WEATHER BY THE WEEKEND. THE SOUTHERN END OF A PACIFIC LOW PRESSURE SYSTEM WILL CAUSE TEMPERATURES TO DROP BACK EARLY NEXT WEEK. && .PSR WATCHES/WARNINGS/ADVISORIES... AZ...NONE. CA...NONE. && ELLIS
The Yuma radar (KYUX), 23 km away, was scanning. The volume nearest the first event began at 02:47 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorms moved westward across parts of Yuma County after 6 pm. Strong winds and dense blowing dust resulted across much of Yuma, with tree limbs blowing down onto power lines. At the Yuma Proving Ground, winds were clocked at 52 mph at 8 pm.
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, September 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: 5422842.