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 Dec 31, 9:15 AM PST, 4 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 915 AM PST FRI DEC 31 2004 .SYNOPSIS...A COLD FRONT MOVING ACROSS SOUTHERN CALIFORNIA WILL BRING RAIN...WIND AND MOUNTAIN SNOW TODAY. A CONTINUED DEEP MARINE LAYER AND INSTABILITY WILL KEEP A THREAT OF SHOWERS THROUGH THE HOLIDAY WEEKEND. FORECAST MODELS ARE HINTING AT A LARGER AND STRONGER STORM EARLY NEXT WEEK. THIS SHOULD BRING PERIODS OF HEAVY RAIN AND SNOW AREA MONDAY...WITH OFF AND ON SHOWERS CONTINUING THROUGH THURSDAY. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES. .SHORT TERM...A COLD FRONT MOVED PAST PT CONCEPTION AROUND 12Z THIS MORNING AND WILL CONTINUE ITS TREK SOUTH DURING THE DAY. SHOWERS WITH EMBEDDED HEAVY RAIN WERE OVER LA COUNTY AT 1630Z. THIS PRECIP WAS MOVING EAST AT 30 MPH AND WILL AFFECT SAN BERNARDINO AND ORANGE COUNTIES THROUGH THE MORNING...THEN SPREAD SOUTHEAST DURING THE AFTERNOON. THE BEST UPPER LEVEL DYNAMICS...COLD AIR ALOFT AND HIGHEST MOISTURE CONTENT WILL BE OVER SAN BERNARDINO COUNTY WHERE THE HEAVIEST PRECIP WILL FALL. WEAKER DYNAMICS FARTHER SOUTH OVER SAN DIEGO COUNTY WILL RESULT IN LESS PRECIP. SNOW LEVELS THIS MORNING WERE AROUND 6500 FEET. SNOW LEVELS WILL FALL IN NORTHERN AREAS AFTER FROPA THIS AFTERNOON WHERE SNOW ACCUMULATIONS IN EXCESS OF 4 INCHES POSSIBLE IN THE RESORT LEVELS. SNOW LEVELS WILL REMAIN FAIRLY HIGH THROUGH THE DAY IN SAN DIEGO COUNTY BEFORE DROPPING THIS EVENING WITH LIGHTER SNOW AMOUNTS ABOVE 6000 FEET. ONCE THE COLD FRONT PASSES THE THREAT FOR SHOWERS WILL DECREASE OVERNIGHT. NO MAJOR SHORTWAVES WILL AFFECT SOCAL THIS WEEKEND...BUT A DEEP MARINE LAYER AND CYCLONIC FLOW ALOFT WILL KEEP THE THREAT FOR ISOLATED SHOWERS SATURDAY AND SUNDAY. .LONG TERM...ANOTHER STRONG SHORTWAVE WILL MOVE DOWN THE COAST SUNDAY NIGHT BRINGING MORE HEAVY RAIN MTN SNOW THROUGH MONDAY. ALL MEDIUM RANGE MODELS ARE HINTING AT ANOTHER VERY COLD UPPER LOW CUTTING OFF EITHER OVER THE STATE OR JUST TO THE W NEXT WEEK. THIS MAKES IT VERY DIFFICULT TO FORECAST ANY DRY WEATHER UNTIL THE FOLLOWING WEEKEND. AN EXTENDED WET PERIOD APPEARS LIKELY TO START OFF THE NEW YEAR. && .SGX WATCHES/WARNINGS/ADVISORIES... RIVER STATEMENT...SAN LUIS REY RIVER RECEDING...SEE LAXRVSSGX HAZARDOUS WEATHER OUTLOOK...SEE LAXHWOSGX. SPECIAL WEATHER STATEMENT...SEE LAXSPSSGX. WINTER WEATHER ADVISORY...SEE LAXWSWSGX. && MOEDE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 1130 AM PST FRI DEC 31 2004 CAZ042-043-048-050-055-056-057-058-060-011400- 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 LUCERNE VALLEYS- 1130 AM PST FRI DEC 31 2004 A WINTER STORM WILL BRING RAIN...WIND AND SNOW TODAY. ANOTHER STORM WILL BRING MORE WINTER WEATHER SUNDAY NIGHT AND MONDAY. THE WEATHER PATTERN WILL REMAIN UNSETTLED WITH PERIODS OF RAIN THROUGH THURSDAY. .DAY ONE... TODAY THROUGH TONIGHT. WINTER WEATHER ADVISORY IN THE MOUNTAINS ABOVE 5000 FEET. AN URBAN AND SMALL STREAM FLOOD ADVISORY IS IN EFFECT FROM THE MOUNTAINS WEST UNTIL 230 PM... POSSIBLE PERIODS OF BRIEF HEAVY RAIN WITH LOCAL URBAN AND SMALL STREAM FLOODING POSSIBLE. SKYWARN ACTIVATION STATEMENT...WEATHER SPOTTERS HAVE BEEN ACTIVATED. .DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY. LARGE SWELL...HIGH SURF AND STRONG RIP CURRENTS POSSIBLE SUNDAY. MONDAY THROUGH THURSDAY... ANOTHER WINTER STORM WILL BRING MORE RAIN AND SNOW MONDAY. OCCASIONAL SHOWERS ARE EXPECTED TUESDAY THROUGH THURSDAY.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 830 AM PST FRI DEC 31 2004 CAZ042-043-048-050-055>058-060>062-312100- 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 LUCERNE VALLEYS- COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 830 AM PST FRI DEC 31 2004 ...STORM SYSTEM WILL AFFECT THE AREA TODAY... A COLD FRONT WILL MOVE THROUGH SOUTHERN CALIFORNIA THIS AFTERNOON. WHILE THIS SYSTEM WILL BE MUCH WEAKER THAN THE STORM TUESDAY AND WEDNESDAY...IT WILL STILL PRODUCE PRECIPITATION OVER MOST OF THE REGION. RAINFALL AMOUNTS WILL BE BETWEEN 1/2 AND 3/4 INCH NEAR THE COAST AND GENERALLY BETWEEN 3/4 AND 1 1/2 INCHES IN THE MOUNTAINS. LOCAL RAINFALL MAY EXCEED 2 INCHES ON SOME OF THE SOUTHWEST SLOPES. THE DESERTS WILL SEE LESS THAN 1/2 INCH. LOCAL SMALL STREAM OR STREET FLOODING WILL BE POSSIBLE WITH THIS STORM... ESPECIALLY NEAR THE BURN AREAS. THE SNOW LEVEL WILL BE LOWER TO AROUND 5000 FEET THIS AFTERNOON. SEVERAL INCHES OF SNOW WILL FALL ABOVE 6000 FEET WITH THE HEAVIEST SNOW IN THE SAN BERNARDINO AND RIVERSIDE COUNTY MOUNTAINS. GUSTY WINDS WILL OCCUR IN THE MOUNTAINS WITH GUSTS EXCEEDING 50 MPH AT TIMES. NEXT WEEK ANOTHER WINTER STORM WILL BRING MORE RAIN AND SNOW MONDAY. WATERSPOUTS WILL BE POSSIBLE OVER THE COASTAL WATERS AS WELL. PEOPLE WITH OUTDOOR OR TRAVEL INTERESTS IN SOUTHWESTERN CALIFORNIA OVER THE NEXT WEEK SHOULD MONITOR THE WEATHER CLOSELY. MOEDE
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Flash Flooding closed Etiwanda Ave.
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, December 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: 5431424.