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 San Diego, CA wrote its last area forecast discussion before the first event at Sep 8, 1:45 PM PST, 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 245 PM PDT WED SEP 8 2004 .SYNOPSIS...WARM MOIST AIR WILL CONTINUE INTO THE WEEKEND AS HIGH PRESSURE ALOFT REMAINS OVER THE REGION AND DRAWS MOISTURE FROM MEXICO. SOME THUNDERSTORMS ARE POSSIBLE OVER THE MOUNTAINS MAINLY DURING THE AFTERNOONS THROUGH FRIDAY. A SHALLOW MARINE LAYER WILL PRODUCE PATCHY COASTAL LOW CLOUDS AND FOG IN THE NIGHTS AND MORNINGS. LOW PRESSURE ALOFT WILL BRING COOLER WEATHER AND MORE EXTENSIVE COASTAL CLOUDS EARLY NEXT WEEK. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES. UPDATED ZONES TO MAKE THUNDERSTORMS ISOLATED FOR THIS AFTERNOON IN THE HIGHER MOUNTAINS AND DESERTS. MOISTURE FROM MEXICO PRODUCED A FEW SHOWERS OVER THE OCEAN THIS MORNING. SOME CONVECTIVE CLOUDS HAVE DEVELOPED TODAY MAINLY IN THE MTNS...BUT THEY ARE BASED RATHER HIGH SO NO PRECIP HAS BEEN DETECTED YET. RH VALUES INCREASED A LOT THIS MORNING IN THE COLORADO DESERT AND UP TO A LESSER EXTENT IN THE MTNS AND MOJAVE DESERT. THE MOISTURE SLOWLY DECREASES EACH DAY THROUGH SAT. AFTER THE CHANCE POPS TODAY...IT APPEARS SLIGHT CHANCE POPS IN MTNS LOOK GOOD FOR THU AND FRI. THE UPPER FLOW TURNS FROM SOUTHEAST TO WESTERLY ESCORTING THE MOISTURE AWAY OVER THE WEEKEND. THE COASTAL FOG WILL BE PATCHY AT BEST EACH NIGHT AND MORNING AT LEAST UNTIL THE DISRUPTING MID LEVEL MOISTURE DEPARTS. TEMPS WILL STAY UP PROBABLY THROUGH SAT. HEIGHTS GRADUALLY LOWER OVER THE WEEKEND LEADING TO A PERSISTENT WEAK TROUGH PATTERN EARLY NEXT WEEK. ALTHOUGH HIGH THICKNESSES PERSIST THROUGH SUN...INCREASED ONSHORE FLOW WILL BRING A COOLING TREND OVER THE WEEKEND...MAINLY WEST OF THE MTNS. SEA TEMPS ARE IN THE LOWER 70S WHICH WILL HELP KEEP COASTAL OVERNIGHT TEMPS RATHER WARM EVEN AS THE COOLING TREND BEGINS. AS THE TROUGH SLOWLY DEEPENS...THE COASTAL CLOUDS WILL BECOME MORE EXTENSIVE. && .SGX WATCHES/WARNINGS/ADVISORIES...NONE. && MM/ATKIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 815 AM PDT WED SEP 8 2004 CAZ042-043-048-050-055>058-060>062-091300- ORANGE COUNTY COASTAL AREAS- SAN DIEGO COUNTY COASTAL AREAS- SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS- SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS- SANTA ANA MOUNTAINS AND FOOTHILLS- SAN DIEGO COUNTY MOUNTAINS- APPLE AND YUCCA VALLEYS- COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 815 AM PDT WED SEP 8 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY THROUGH TONIGHT. HIGH PRESSURE ALOFT WILL CONTINUE HOT WEATHER INLAND THROUGH THE END OF THE WEEK. A SHALLOW MARINE LAYER WILL CAUSE PATCHY COASTAL LOW CLOUDS AND FOG IN THE NIGHTS AND MORNINGS. MOISTURE IN SOUTHEAST FLOW ALOFT WILL BRING A CHANCE OF THUNDERSTORMS TO THE MOUNTAINS TODAY. DUE TO THIS WEATHER PATTERN...THE FOLLOWING HAZARDOUS WEATHER EVENTS ARE OCCURING... A CHANCE OF THUNDERSTORMS WHICH MAY CONTAIN DANGEROUS LIGHTNING...SMALL HAIL...STRONG GUSTY WINDS...BRIEF HEAVY RAIN AND LOCAL FLASH FLOODING... INCREASED FIRE WEATHER HAZARD DUE TO DRY LIGHTNING... FOR SAN BERNARDINO COUNTY MOUNTAINS... RIVERSIDE COUNTY MOUNTAINS... SAN DIEGO COUNTY MOUNTAINS... .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY. HIGH PRESSURE ALOFT WILL CONTINUE HOT WEATHER INLAND THROUGH THE END OF THE WEEK. A SHALLOW MARINE LAYER WILL CAUSE PATCHY COASTAL LOW CLOUDS AND FOG IN THE NIGHTS AND MORNINGS. MOISTURE IN SOUTHEAST FLOW ALOFT WILL BRING A SLIGHT CHANCE OF THUNDERSTORMS TO THE MOUNTAINS DURING THE AFTERNOONS THURSDAY AND FRIDAY. UPPER LEVEL LOW PRESSURE WILL BRING COOLER WEATHER WITH AN INCREASING MARINE LAYER EARLY NEXT WEEK. DUE TO THIS WEATHER PATTERN...THE FOLLOWING HAZARDOUS WEATHER EVENTS ARE OCCURING... A CHANCE OF THUNDERSTORMS WHICH MAY CONTAIN DANGEROUS LIGHTNING...SMALL HAIL...STRONG GUSTY WINDS...BRIEF HEAVY RAIN AND LOCAL FLASH FLOODING... FOR SAN BERNARDINO COUNTY MOUNTAINS... RIVERSIDE COUNTY MOUNTAINS... SAN DIEGO COUNTY MOUNTAINS... THURSDAY THROUGH FRIDAY. MM
The San Diego radar (KNKX), 134 km away, was scanning. The volume nearest the first event began at 22:31 UTC.
1 flash flood. Local standard time, as filed.
A thunderstorm dropped 1.15" of rain in one hour in the Pine Cove area. Some sheet flow and rock slides were observed along Hwy 74 east of Lake Hemet.
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, 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: 5422708.