1 funnel cloud, 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 Oct 20, 1:00 PM PST, 3 hours 18 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 200 PM PDT WED OCT 20 2004 .SYNOPSIS...A STRONG FRONTAL SYSTEM WAS MOSTLY OUT OF THE AREA WITH THE BACK EDGE OF THE FRONT MOVING THROUGH NORTHERN SAN DIEGO COUNTY. THE UPPER LEVEL LOW AND COLD AIR ALOFT WILL MOVE OVER TONIGHT AND THURSDAY WITH A CHANCE OF THUNDERSTORMS AND SOME SNOW IN THE HIGHEST ELEVATIONS. SHOWERS AND POSSIBLE THUNDERSTORMS ON THURSDAY WILL DECREASE FROM THE NORTH THURSDAY NIGHT AND EARLY FRIDAY MORNING. THE TROUGH WILL WEAKEN OVER THE AREA WITH HIGHER PRESSURE ALOFT LATE FRIDAY THROUGH MONDAY. ANOTHER COLD FRONT IS EXPECTED TUESDAY INTO WEDNESDAY. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES. THE FRONT WAS WEAKENING AND MOVING OUT OF SAN DIEGO COUNTY EARLY THIS AFTERNOON. SHOWERS WILL MOVE IN AS THE UPPER LEVEL LOW DROPS SOUTH. GUSTY WINDS WERE DECREASING ALSO. LOCAL AREAS COULD RECEIVE ABOUT AN HALF INCH TO ONE INCH FROM SHOWERS AND THUNDERSTORMS TONIGHT THROUGH THURSDAY. COLD AIR FROM THE UPPER LEVEL LOW WILL MOVE OVER THE AREA TONIGHT AND THURSDAY WITH SHOWERS AND POSSIBLE THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL. SOME SHOWERS MAY LINGER INTO FRI MORNING THEN THE TROUGH WILL WEAKEN WITH HIGHER PRESSURE ALOFT OVER SOCAL. A WEAK TROUGH WILL REMAIN OVER THE AREA SATURDAY THROUGH MONDAY. A LARGE TROUGH DEEPENS INTO THE AREA TUE THRU WED WITH ANOTHER COLD FRONT MOVING THRU SOCAL. && .SGX WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH AND WARNINGS...SEE LAXFFASGX...LAXFFWSGX AND LAXFLSSGX. WIND ADVISORY...SEE LAXNPWSGX. HAZARDOUS WEATHER OUTLOOK...SEE LAXHWOSGX. && WHITLOW
HWOSGX HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 200 PM PDT WED OCT 20 2004 CAZ042-043-048-050-211300- ORANGE COUNTY COASTAL AREAS- SAN DIEGO COUNTY COASTAL AREAS- SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS- 200 PM PDT WED OCT 20 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR COASTAL AND VALLEY AREAS IN SOUTHWESTERN CALIFORNIA. .DAY ONE... TONIGHT. FLASH FLOOD WATCH CONTINUES IN EFFECT UNTIL 200 PM THURSDAY. RIP CURRENT POTENTIAL IS HIGH FOR THE ORANGE AND SAN DIEGO COUNTY BEACHES. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY. A TROUGH OF LOW PRESSURE WITH BRING SCATTERED SHOWERS AND POSSIBLE THUNDERSTORMS THURSDAY. PERIODS OF HEAVY RAIN WITH FLASH FLOODING AND MUDSLIDES ARE POSSIBLE. CAZ055-056-057-058-211300- SAN BERNARDINO COUNTY MOUNTAINS- RIVERSIDE COUNTY MOUNTAINS- SANTA ANA MOUNTAINS AND FOOTHILLS- SAN DIEGO COUNTY MOUNTAINS- 200 PM PDT WED OCT 20 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MOUNTAIN AREAS IN SOUTHWESTERN CALIFORNIA. .DAY ONE...TONIGHT. FLASH FLOOD WATCH CONTINUES IN EFFECT UNTIL 200 PM THURSDAY. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY. POSSIBLE PERIODS OF HEAVY RAIN WITH FLASH FLOODING AND MUDSLIDES THURSDAY. CAZ060-061-062-211300- APPLE AND YUCCA VALLEYS- COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 200 PM PDT WED OCT 20 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR DESERT AREAS IN SOUTHWESTERN CALIFORNIA. .DAY ONE...TONIGHT. FLASH FLOOD WATCH CONTINUES IN EFFECT FOR APPLE AND YUCCA VALLEYS UNTIL 200 PM THURSDAY. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY. POSSIBLE PERIODS OF HEAVY RAIN WITH URBAN AND SMALL STREAM FLOODING THURSDAY. MOEDE
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1122 AM PDT WED OCT 20 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
1050 AM FLASH FLOOD RIVERSIDE 33.94N 117.40W
10/20/2004 RIVERSIDE CA DEPT OF HIGHWAYS
FLOODED LANE ON WESTBOUND HWY 60 AT ROUBIDOUX RD.
1050 AM FLASH FLOOD TUSTIN 33.73N 117.81W
10/20/2004 ORANGE CA DEPT OF HIGHWAYS
FLOODING ON HWY 241 AT HWY 261 NORTHEAST OF TUSTIN.
1050 AM FLASH FLOOD VALLEY CENTER 33.22N 117.01W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODING ROADS IMPASSABLE AT WOODS VALLEY RD AT COOL
WATER RANCH RD.
0321 AM FLASH FLOOD WRIGHTWOOD 34.36N 117.63W
10/20/2004 SAN BERNARDINO CA DEPT OF HIGHWAYS
HWY 2 WASHED OUT AT SHEEP CREEK DR. 2 FEET OF MUD AND
ROCKS ON ROADWAY. VEHICLE STUCK. BRIDGE WASHED OUT. ROAD
CLOSED FROM HWY 138.
1050 AM FLASH FLOOD ESCONDIDO 33.14N 117.07W
10/20/2004 SAN DIEGO CA NWS EMPLOYEE
ESCONDIDO CREEK AT HARMONY GROVE RD IS 1 FOOT FROM
COVERING ROAD. SEVERAL INTERSECTIONS IN VICINITY WITH UP
TO 4 INCHES WATER.
1045 AM FLASH FLOOD HESPERIA 34.42N 117.30W
10/20/2004 SAN BERNARDINO CA TRAINED SPOTTER
FLOODED ROADWAYS WITH 6 TO 8 INCHES OF WATER, AND 1 FOOT
DEEP IN LOW SPOTS.
1013 AM NON-TSTM WND GST VALLEY CENTER 33.22N 117.01W
10/20/2004 0 MPH SAN DIEGO CA TRAINED SPOTTER
WINDS 40 TO 45 MPH.
1018 AM FLASH FLOOD COSTA MESA 33.67N 117.91W
10/20/2004 ORANGE CA TRAINED SPOTTER
FLOODING, 3.52 INCHES SINCE MIDNIGHT.
1035 AM FLASH FLOOD VALLEY CENTER 33.22N 117.01W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODED ROADWAY OF HWY 76 AT COLE GRADE RD.
1035 AM FLASH FLOOD CHULA VISTA 32.64N 117.08W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
ROADWAY FLOODING ON OTAY LAKES RD. NEAR HWY 94.
1035 AM FLASH FLOOD RIVERSIDE 33.94N 117.40W
10/20/2004 RIVERSIDE CA DEPT OF HIGHWAYS
MUD SLIDE ON HWY 60 AT PEDLEY RD.
1037 AM FLASH FLOOD CHINO HILLS 33.97N 117.75W
10/20/2004 SAN BERNARDINO CA DEPT OF HIGHWAYS
MUD SLIDE 6 INCHES DEEP COVERING HWY 142, CARBON CANYON
RD. AT CANON LN.
1037 AM FLASH FLOOD ONTARIO 34.05N 117.61W
10/20/2004 SAN BERNARDINO CA DEPT OF HIGHWAYS
FLOODED LANE CLOSURE WESTBOUND I-10 AT MILLIKEN AV. DUE
TO MUD AND DEBRIS.
1037 AM FLASH FLOOD MIRA LOMA 33.98N 117.51W
10/20/2004 RIVERSIDE CA DEPT OF HIGHWAYS
FLOODING AT FLESPAR ST. AND 56TH ST. CAR STUCK IN WATER.
1115 AM FLASH FLOOD SAN DIEGO 32.72N 117.16W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
ROADS SLIGHTLY FLOODED ON HWY 163 JUST SOUTH OF I-8.
1115 AM FLASH FLOOD SAN DIEGO 32.72N 117.16W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODING ALONG WESTBOUND HWY 56 AT BLACK MOUNTAIN RD.
WATER ACROSS ALL LANES.
1105 AM FLASH FLOOD 2 E HESPERIA 34.42N 117.26W
10/20/2004 SAN BERNARDINO CA TRAINED SPOTTER
STREET FLOODING. MANY INTERSECTIONS 8 TO 10 INCHES OF
WATER, SOME AREAS 1 FOOT OF WATER. BACKYARD 4 INCHES OF
WATER. 1.32 INCHES OF RAINFALL SINCE MIDNIGHT.
1112 AM FLASH FLOOD BONSALL 33.28N 117.22W
10/20/2004 SAN DIEGO CA TRAINED SPOTTER
MUD AND DEBRIS ON HWY 76 ONE MILE WEST OF OLIVE HILL.
&&
MMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1252 PM PDT WED OCT 20 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
1215 PM FLASH FLOOD CUYAMACA PEAK 32.95N 116.61W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
MUD SLIDE ON HWY 79 AT LAKE CUYAMACA.
1215 PM FLASH FLOOD DULZURA 32.64N 116.78W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
MUDSLIDE ON HWY 94 AT DULZURA.
1215 PM FLASH FLOOD ALPINE 32.84N 116.76W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
MUDSLIDE IN CREST WESTBOUND I-8 AT DUNBAR LN.
1215 PM FLASH FLOOD PAUMA VALLEY 33.30N 116.98W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODED ROADWAY ON HWY 76 IN TWO SPOTS NEAR RICE CANYON
RD., AND 3 INCHES OF FLOWING WATER AT EL CINDO.
1155 AM FLASH FLOOD ESCONDIDO 33.14N 117.07W
10/20/2004 SAN DIEGO CA NWS EMPLOYEE
FLOODING AT COUNTRY CLUB RD. AND HARMONY GROVE RD. THE
LATTER IS CLOSED AT ESCONDIDO CREEK. 2 TO 3 FEET OF WATER
RUNNING OVER THE ROAD.
1129 AM FLASH FLOOD SAN MARCOS 33.14N 117.17W
10/20/2004 SAN DIEGO CA TRAINED SPOTTER
FLOODED ROAD AT CRAVEN. 3 TO 4 FEET OF SWIFT MOVING
WATER.
1125 AM FLASH FLOOD VALLEY CENTER 33.22N 117.01W
10/20/2004 SAN DIEGO CA TRAINED SPOTTER
FLOODING ON LAKE WOHLFORD RD. AT VALLEY CENTER RD. CLOSED
DUE TO FLOODING AND DEBRIS.
1138 AM HIGH SUST WINDS ALPINE 32.84N 116.76W
10/20/2004 0 MPH SAN DIEGO CA TRAINED SPOTTER
WIND GUST 44 MPH.
1140 AM FLASH FLOOD SAN DIEGO 32.72N 117.16W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODING ON WESTBOUND HWY 94 AT EUCLID OFFRAMP.
1141 AM FLASH FLOOD SAN DIEGO 32.72N 117.16W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODED ONRAMP ON I-5 AND 1ST AV. IN DOWNTOWN.
1141 AM FLASH FLOOD RANCHITA 33.21N 116.52W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
MUDSLIDE AT JUNCTION OF S22 AND S2 WEST OF RANCHITA.
1141 AM FLASH FLOOD NATIONAL CITY 32.67N 117.10W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODED ROADWAY ON I-805 AT PLAZA BLVD.
1141 AM FLASH FLOOD CHULA VISTA 32.64N 117.08W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODED AT NORTHBOUND I-805 JUST SOUTH OF MAIN ST.
1142 AM FLASH FLOOD RANCHO CUCAMONGA 34.12N 117.57W
10/20/2004 SAN BERNARDINO CA DEPT OF HIGHWAYS
LANES CLOSED DUE TO FLOODING ON NORTHBOUND EUCLID.
MOUNTAIN AND EUCLID CLOSED TO MT. BALDY.
1142 AM FLASH FLOOD MIRA LOMA 33.98N 117.51W
10/20/2004 RIVERSIDE CA DEPT OF HIGHWAYS
FLOODING AT LIMONITE AND LUCRETIA AVS.
1143 AM FLASH FLOOD FONTANA 34.10N 117.46W
10/20/2004 SAN BERNARDINO CA DEPT OF HIGHWAYS
FLOODING CLOSED VALLEY BLVD. AT COMMERCE.
1144 AM FLASH FLOOD COSTA MESA 33.67N 117.91W
10/20/2004 ORANGE CA DEPT OF HIGHWAYS
HARBOR BLVD. ONRAMP TO I-405 FLOODED.
1144 AM FLASH FLOOD HEMET 33.73N 117.00W
10/20/2004 RIVERSIDE CA DEPT OF HIGHWAYS
LARGE BOULDERS IN ROADWAY EAST OF HEMET NEAR THE RANGER
STATION.
1249 AM FLASH FLOOD SAN JUAN CAPISTRANO 33.50N 117.65W
10/20/2004 ORANGE CA DEPT OF HIGHWAYS
ROCKS BLOCKING THE ROADWAY ON HWY 74 JUST EAST OF LA PATA
AV. EAST OF SAN JUAN CAPISTRANO.
&&
MMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
221 PM PDT WED OCT 20 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0130 PM AVALANCHE ESCONDIDO 33.14N 117.07W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
ROCKS IN RANCHO SANTA FE ON EL CAMINO DEL NORTE AND DEL
DIOS HWY AND NEAR LAKE HODGES ON DEL DIOS HWY.
0105 PM FLASH FLOOD RAMONA 33.04N 116.87W
10/20/2004 SAN DIEGO CA COUNTY OFFICIAL
ROAD CLOSED MUSSEY GRADE SOUTHWEST OF RAMONA.
0105 PM FLASH FLOOD EL CAJON 32.80N 116.96W
10/20/2004 SAN DIEGO CA COUNTY OFFICIAL
ROAD CLOSURE AND HOUSES FLOODED IN EAST EL CAJON AT
GREENFIELD RD.
0105 PM FLASH FLOOD SPRING VALLEY 32.72N 116.99W
10/20/2004 SAN DIEGO CA COUNTY OFFICIAL
QUARRY ROAD CLOSED DUE TO 5 TO 6 FEET OF WATER.
0105 PM FLASH FLOOD CHULA VISTA 32.64N 117.08W
10/20/2004 SAN DIEGO CA COUNTY OFFICIAL
ROAD CLOSED OTAY LAKES RD. FROM 1,000 TRAILS CAMPGROUND
TO CHULA VISTA. ORCHARD RD. ALSO CLOSED.
0139 PM FLASH FLOOD FALLBROOK 33.37N 117.24W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
ROADWAY FLOODED, SANDIA CREEK RD. AT ROCK MOUNTAIN DR.
NORTH OF FALLBROOK.
0130 PM FLASH FLOOD LAKESIDE 32.85N 116.91W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
ROAD FLOODED IN LOW SPOT OF WILDCAT CANYON RD. NEAR SAN
VICENTE RD.
0120 PM FLASH FLOOD DULZURA 32.64N 116.78W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
ROAD FLOODED ON HWY 94 AT OTAY LAKES RD.
0120 PM FLASH FLOOD CHULA VISTA 32.64N 117.08W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
I-805 FLOODED AT E ST. AND TELEGRAPH CANYON RD.
0216 PM FLASH FLOOD LEMON GROVE 32.73N 117.03W
10/20/2004 SAN DIEGO CA DEPT OF HIGHWAYS
FLOODED ROAD ONRAMP LEMON GROVE AV. TO HWY 94.
0114 PM FLASH FLOOD VALLEY CENTER 33.22N 117.01W
10/20/2004 SAN DIEGO CA TRAINED SPOTTER
3 INCHES OF WATER AND DEBRIS AT LILAC AND OLD CASTLE.
&&
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</html>The Santa Ana Mts radar (KSOX), 20 km away, was scanning. The volume nearest the first event began at 00:15 UTC.
1 funnel cloud. Local standard time, as filed.
Several funnel clouds were spotted offshore from San Clemente.
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, October 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 2026-10-01. Each event’s entry at NCEI: 5427068.