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 Phoenix, AZ wrote its last area forecast discussion before the first event at Aug 1, 3:15 PM MST, 45 minutes earlier.
AZZ020>028-CAZ030>033-020545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 315 PM MST FRI AUG 1 2003 .SYNOPSIS... HIGH PRESSURE ALOFT IS EXPECTED TO REMAIN OVER NEW MEXICO THROUGH NEXT WEEK. A WEAK LOW PRESSURE SYSTEM OFF THE CENTRAL CALIFORNIA COAST WILL MOVE NORTHEAST OVER NORTHERN CALIFORNIA SATURDAY. A FLOW ALOFT FROM THE SOUTH HAS BROUGHT AN INCREASE IN MOISTURE FOR A CONTINUED CHANCE OF SHOWERS AND THUNDERSTORMS THIS EVENING. DRIER AIR ALOFT FROM THE SOUTHWEST WILL MOVE INTO SOUTHEAST CALIFORNIA AND FAR SOUTHWEST ARIZONA THIS WEEKEND...SPREADING TO THE SOUTH-CENTRAL ARIZONA DESERT AREAS BY EARLY NEXT WEEK FOR MORE SUNSHINE...AND A REDUCTION IN THUNDERSTORMS. .DISCUSSION... PLENTY OF MOISTURE IN THE ATMOSPHERE WITH RELATIVELY HIGH DEW POINT TEMPERATURES. A FLASH FLOOD WARNING WAS ISSUED FOR NORTH CENTRAL RIVERSIDE COUNTY AT MID AFTERNOON DUE TO FLOODING FROM HEAVY RAIN FROM THUNDERSTORMS IN THE NORTH END OF THE PARK NEAR THE NORTH ENTRANCE...TWENTYNINE PALMS AREA. TEMPERATURES RANGED FROM NEARLY THE SAME IN IMPERIAL COUNTY CALIFORNIA TO MORE THAN 10 DEGREES COOLER FROM JOSHUA TREE NATIONAL PARK EAST TO THE PHOENIX AREA AT MID AFTERNOON TODAY COMPARED WITH THE SAME TIME YESTERDAY. THIS WAS DUE TO RAINFALL LAST NIGHT INTO THIS MORNING WITH LINGERING CLOUD COVER THIS MORNING. CLEARING FROM THE SOUTH THAT TOOK PLACE TODAY ALLOWED DAYTIME HEATING TO DEVELOP THUNDERSTORMS OVER THE HIGHER TERRAIN...BUT AT MID AFTERNOON THERE WERE LITTLE IF ANY THUNDERSTORMS IN MOST DESERT AREAS FROM FAR SOUTHEAST CALIFORNIA TO SOUTH-CENTRAL ARIZONA. WITH AS MUCH MOISTURE IN THE AIR AS THERE IS...THERE IS STILL A CHANCE OF SHOWERS AND THUNDERSTORMS REDEVELOPING INTO THE EVENING HOURS WHICH IS REFLECTED IN THE FORECAST. WITH THE WEAK LOW PRESSURE SYSTEM OFF THE CENTRAL CALIFORNIA COAST EXPECTED TO WEAKEN FURTHER AND MOVE NORTHEAST OVER NORTHERN CALIFORNIA SATURDAY...DRIER AIR ALOFT FROM THE SOUTHWEST WILL MOVE INTO SOUTHEAST CALIFORNIA AND FAR SOUTHWEST ARIZONA THIS WEEKEND...SPREADING TO THE SOUTH-CENTRAL DESERT AREAS BY EARLY NEXT WEEK FOR MORE SUNSHINE...AND A REDUCTION IN THUNDERSTORMS. .PSR...NONE. ELLIS
AZZ020>028-CAZ030>033-020100- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 600 AM MST FRI AUG 1 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST AND SOUTH-CENTRAL ARIZONA...AND SOUTHEAST CALIFORNIA. .DAY ONE...TODAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.
The Phoenix radar (KIWA), 52 km away, was scanning. The volume nearest the first event began at 23:02 UTC.
1 flash flood. Local standard time, as filed.
Several homes near Golder Ranch Road were impacted when water in Canada del Oro wash rose 2 to 6 feet. A gauge near Oracle Ridge reported 1.10 inches of rain.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2003Every state in 2003This day in weather historyWarnings in Arizona, August 2003
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: 5374729.