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 Los Angeles, CA wrote its last area forecast discussion before the first event at Sep 3, 7:30 AM PST, 5 hours earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 830 AM PDT SUN SEP 3 2001 LATEST SATELLITE/SURFACE OBS INDICATE WIDESPREAD MARINE LAYER SOUTH OF POINT CONCEPTION...EXTENDING INTO MOST COASTAL VALLEY AREAS... WITH EVEN SOME LOCALIZED DRIZZLE. ALONG THE CENTRAL COAST...MARINE LAYER NOT AS EXTENSIVE INLAND. EXPECT THE STRATUS/FOG TO BURN OFF NICELY LATER TODAY...WITH ALL AREAS SEEING PLENTY OF SUNSHINE. AS FOR MOUNTAIN/DESERT CONVECTION...CURRENT 20% POPS FOR 53/54/59 LOOK FINE. 12Z KNKX SOUNDING INDICATES SOME DECREASE IN PRECIPITABLE WATER...BUT STILL PLENTY ENOUGH TO PRODUCE SOME AFTERNOON CBS OVER OUR MOUNTAINS. ALSO...WEAK UPPER LOW IS PROGGED TO MOVE ACROSS THE AREA TODAY...WHICH SHOULD HELP THE POSSIBILITY OF SOME THUNDER DEVELOPMENT. AS FOR TEMPS...TEMP STUDY INDICATES SLIGHTLY COOLER BOUNDARY LAYER THIS MORNING ACROSS THE LAX BASIN. THEREFORE...WITH MORE WIDESPREAD MARINE LAYER...TEMPS ACROSS LAX/VTU COUNTIES SHOULD BE PERSISTENT OR A COUPLE DEGREES COOLER. NORTH OF POINT CONCEPTION...12Z KVBG SOUNDING INDICATED WARMER BOUNDARY LAYER. THIS WARMING...COMBINED WITH LESS WIDESPREAD MARINE INFLUENCE SHOULD ALLOW FOR SOME SLIGHT WARMING ACROSS SBA/SLO COUNTIES. OVERALL...CURRENT ZONES HAVE A GOOD HANDLE ON TEMPS...CLOUDS AND CONVECTION. THEREFORE...NO UPDATES PLANNED AT THIS TIME. LAX 000. THOMPSON .LAX...NONE.
The Los Angeles radar (KVTX), 8 km away, was scanning. The volume nearest the first event began at 20:28 UTC.
1 flash flood. Local standard time, as filed.
Strong monsoonal thunderstorms produced heavy rain and flash flooding across the mountains of Ventura county. Flash flooding was reported along Lockwood Valley Road about 2 miles west of Mutau Flat Road. Some shoulder damage occurred.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2001Every state in 2001This day in weather historyWarnings in California, September 2001
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: 5263828.