1 heavy rain, 1 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 San Diego, CA wrote its last area forecast discussion before the first event at Aug 13, 1:00 PM PST, 2 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO 200 PM PDT FRI AUG 13 2004 .SYNOPSIS...SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS AND DESERTS WILL BE LESS WIDESPREAD OVER THE WEEKEND AS THE MONSOON FLOW DECREASES. A WEAK UPPER TROUGH WILL BRING SLIGHT COOLING AND A DEEPER MARINE LAYER EARLY NEXT WEEK. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES. SEVERAL CONVECTIVE COMPLEXES DEVELOPED TODAY IN A VERY MOIST ATMOPSHERE. AT 18Z THE PW AT NKX WAS 1.74 INCHES. OUTFLOW BOUNDARIES TRIGGERED CONVECTION OVER THE INLAND EMPIRE THIS MORNING...AND OVER THE SAN DIEGO AND RIVERSIDE COUNTY MTNS THIS AFTERNOON. LOW LEVEL MOISTURE SUFFICIENT FOR AFTERNOON HEATING TO KEEP STORMS GOING INTO EARLY EVENING OVER THE MTNS AND DESERTS WITH FLASH FLOODING FROM VERY HEAVY RAIN. THE POTENTIAL ALSO EXISTS FOR OUTFLOW BOUNDARIES FROM THE STORMS OVER SAN DIEGO AND RIVERSIDE COUNTIES TO PRODUCE ISOLATED STORMS IN THE INLAND VALLEYS. STAGNANT UPPER FLOW TONIGHT BEGINS TO TRANSITION TO A DRIER SW FLOW OVER THE WEEKEND...BUT IT WILL BE A SLOW PROCESS. ENOUGH RESIDUAL MOISTURE WILL LINGER INTO SATURDAY FOR CONTINUED CHANCES OF THUNDERSTORMS OVER THE MTNS AND DESERTS...THEN DRIER SW FLOW LOOKS LIKE IT WILL PUSH MOST OF THE THUNDERSTORM ACTIVITY EAST SUNDAY ALTHOUGH ENOUGH MOISTURE WILL BE AROUND FOR MOUNTAIN CUMULUS TO FORM IN THE AFTERNOON. .LONG RANGE...MODELS STILL IN SOME DISAGREEMENT BEYOND MONDAY...BUT ARE TRENDING TOWARD A WEAK RIDGE BUILDING OVER THE WEST FOR WARMER WEATHER THE MIDDLE OF NEXT WEEK FOR A POSSIBLE RETURN OF MONSOON SOUTHEAST FLOW. .SGX WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH...SEE FFASGX. && MAXWELL/MOEDE
HAZARDOUS WEATHER OUTLOOK...UPDATE NATIONAL WEATHER SERVICE SAN DIEGO CA 400 PM PDT FRI AUG 13 2004 CAZ042-043-048-050-057-141300- ORANGE COUNTY COASTAL AREAS- SAN DIEGO COUNTY COASTAL AREAS- SAN BERNARDINO COUNTY AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS- SANTA ANA MOUNTAINS AND FOOTHILLS- 400 PM PDT FRI AUG 13 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ORANGE COUNTY...THE SAN DIEGO COUNTY COASTAL AREAS...THE INLAND EMPIRE...AND THE SANTA ANA MOUNTAINS. .DAY ONE... TODAY THROUGH TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED. CAZ056-061-141300- RIVERSIDE COUNTY MOUNTAINS- COACHELLA VALLEY- 400 PM PDT FRI AUG 13 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE RIVERSIDE COUNTY MOUNTAINS AND THE COACHELLA VALLEY. .DAY ONE... TODAY THROUGH TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO AND THREE... SATURDAY AND SUNDAY. SCATTERED THUNDERSTORMS ARE POSSIBLE SATURDAY AFTERNOON..AND ISOLATED THUNDERSTORMS ARE POSSIBLE ON SUNDAY AFTERNOON. THUNDERSTORMS HAVE DEADLY LIGHTNING AND WILL HAVE BRIEF HEAVY RAIN...STRONG GUSTY WINDS AND HAIL. HEAVY RAIN COULD CAUSE FLOODING AND MUD SLIDES...ESPECIALLY IN THE RECENTLY BURNED AREAS. .DAYS FOUR THROUGH SEVEN... MONDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED. CAZ055-058-060-062-141300- SAN BERNARDINO COUNTY MOUNTAINS- SAN DIEGO COUNTY MOUNTAINS- APPLE AND YUCCA VALLEYS- SAN DIEGO COUNTY DESERTS- 400 PM PDT FRI AUG 13 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MOUNTAINS AND DESERTS OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY THROUGH TONIGHT. FLASH FLOOD WATCH UNTIL 800 PM. MOISTURE IN SOUTHERLY FLOW ALOFT WILL CAUSE SCATTERED THUNDERSTORMS IN THE MOUNTAINS AND DESERTS INTO THIS EVENING. THUNDERSTORMS HAVE DEADLY LIGHTNING AND WILL HAVE BRIEF HEAVY RAIN...STRONG GUSTY WINDS AND HAIL. HEAVY RAIN COULD CAUSE FLOODING AND MUD SLIDES...ESPECIALLY IN THE RECENTLY BURNED AREAS. .DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY. MOIST UNSTABLE AIR WILL CONTINUE ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS IN THE MOUNTAINS AND DESERTS SATURDAY AND SUNDAY AFTERNOON. THUNDERSTORMS HAVE DEADLY LIGHTNING AND MAY HAVE BRIEF HEAVY RAIN...STRONG GUSTY WINDS AND HAIL. LOCAL HEAVY RAIN COULD CAUSE FLOODING AND MUD SLIDES...ESPECIALLY IN THE RECENTLY BURNED AREAS. DRIER SOUTHWEST FLOW ALOFT WILL DEVELOP EARLY NEXT WEEK. MAXWELL/JAD
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
234 PM PDT FRI AUG 13 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0900 AM FLASH FLOOD 7 E JULIAN 33.07N 116.47W
08/13/2004 SAN DIEGO CA LAW ENFORCEMENT
REPORTED BY CHP...HEAVY RAINS FROM HIGHWAY S2 TO 78. MUD
ON HIGHWAY 78 WITH STANDING WATER ON ROAD.
&&
PURPURAPRELIMINARY LOCAL STORM REPORT ...CORRECTED EVENT TIME...
NATIONAL WEATHER SERVICE SAN DIEGO CA
236 PM PDT FRI AUG 13 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0219 PM FLASH FLOOD 7 E JULIAN 33.07N 116.47W
08/13/2004 SAN DIEGO CA LAW ENFORCEMENT
REPORTED BY CHP...HEAVY RAINS FROM HIGHWAY S2 TO 78. MUD
ON HIGHWAY 78 WITH STANDING WATER ON ROAD.
&&
PURPURAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
409 PM PDT FRI AUG 13 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0311 AM FLASH FLOOD 15 NE JULIAN 33.23N 116.40W
08/13/2004 SAN DIEGO CA LAW ENFORCEMENT
CHP REPORTS ROCKS AND WATER ALL OVER LANES ON HIGHWAY 78
AT JEO YAQUI PASS
&&
PURPURAThe San Diego radar (KNKX), 134 km away, was scanning. The volume nearest the first event began at 23:29 UTC.
1 heavy rain, 1 flash flood. Local standard time, as filed.
Heavy rain from thunderstorms resulted in the partial collapse of an office building's roof in Indio.
A slow moving thunderstorm sent water rushing over Jefferson Street in La Quinta. The water in some spots was a little more than one foot deep.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2004Every state in 2004This day in weather historyWarnings in California, 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: 5418552, 5418553.