Remnant moisture from Hurricane Linda generated strong thunderstorms across Los Angeles county. Heavy rain from these thunderstorms resulted in flash flooding as well as mud/debris flows across parts of Los Angeles county.
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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 episode as NWS LOX wrote it up.
Remnant moisture from Hurricane Linda generated strong thunderstorms across Los Angeles county. Heavy rain from these thunderstorms resulted in flash flooding as well as mud/debris flows across parts of Los Angeles county.
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 9, 12:55 PM PST, 2 hours 20 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 155 PM PDT WED SEP 9 2015 .SYNOPSIS... THERE IS A CHANCE OF THUNDERSTORMS AND SHOWERS IN THE MOUNTAINS AND DESERTS THROUGH SATURDAY. TEMPERATURES AND HUMIDITY WILL PEAK IN MOST LOCATIONS TODAY AND THURSDAY THEN TAPER OFF ON FRIDAY AND INTO THE WEEKEND. THE MARINE LAYER WILL RETURN AND TEMPERATURES WILL BE NEAR NORMAL BY THE MIDDLE OF NEXT WEEK. && .SHORT TERM (TODAY-SAT)... AFTERNOON TEMPERATURES ARE INTO THE TRIPLE DIGITS IN MOST OF THE SAN FERNANDO AND SAN GABRIEL VALLEYS AS WELL AS IN MANY OTHER LOCATIONS AROUND THE REGION. TODAY AND TOMORROW CONTINUE TO LOOK LIKE THE PEAK OF THE TEMPERATURES... SOME LOCATIONS A BIT HIGHER TODAY AND SOME A BIT HIGHER TOMORROW... WITH SLIGHT COOLING INTO THE WEEKEND. HUMIDITY LEVELS WILL REMAIN ELEVATED INTO THE WEEKEND SO EVEN WITH SLIGHTLY COOLER TEMPERATURES IT WILL NOT FEEL AS THOUGH THERE IS MUCH OF A DIFFERENCE. ELEVATED MOISTURE LEVELS AND MARGINAL INSTABILITY THROUGH SATURDAY WILL KEEP A SLIGHT CHANCE OF THUNDERSTORMS AND SHOWERS IN THE VENTURA AND LOS ANGELES COUNTY MOUNTAINS THROUGH SATURDAY WITH A SLIGHT CHANCE OF THUNDERSTORMS IN SANTA BARBARA COUNTY TODAY AND THURSDAY. THE INSTABILITY LOOKS BETTER TODAY AND TOMORROW BUT THE ACCESS TO MOISTURE IMPROVES FRIDAY AND SATURDAY SO IF EITHER OF THOSE PARAMETERS IMPROVES THERE COULD BE AN ENHANCED CHANCE OF THUNDERSTORMS. .LONG TERM (SUN-WED)... TEMPERATURES WILL COOL MORE READILY BEGINNING LATE SUNDAY AND WILL BE NEAR NORMAL BY THE MIDDLE OF NEXT WEEK. AS HURRICANE LINDA MOVES WESTWARD THE HUMIDITY LEVELS WILL DIMINISH AND OVERALL CONDITIONS WILL BE QUITE COMFORTABLE. ONSHORE FLOW WILL INCREASE BY EARLY IN THE WEEK AND THIS WILL COOL TEMPERATURES ALONG THE COAST MORE QUICKLY THAN INLAND. && .AVIATION...09/1800Z. AT 1800Z...THERE WAS NO MARINE LAYER AT KLAX. VFR CONDITIONS ARE EXPECTED THROUGHOUT THE PERIOD. THERE IS A LESS THAN 10 PERCENT CHANCE OF COASTAL CLOUDS OVERNIGHT. THERE IS A 20 PERCENT CHANCE OF THUNDERSTORMS FOR THE DESERT TERMINALS TODAY...MAINLY BETWEEN 20Z AND 04Z. KLAX AND KBUR...HIGH CONFIDENCE IN VFR CONDITIONS THROUGHOUT THE PERIOD. && .MARINE...09/200 PM. LIGHT TO LOCALLY MODERATE WEST TO NORTHWEST WINDS WILL OCCUR ACROSS THE COASTAL WATERS THROUGH LATE WEEK. THE SWELLS FROM LINDA WILL BUILD OVER THE COASTAL WATERS LATE TODAY AND PERSIST THROUGH FRIDAY NIGHT. && .BEACHES...09/200 PM. A 14-SECOND SOUTH TO SOUTHEAST SWELL FROM HURRICANE LINDA WILL GRADUALLY BUILD THIS EVENING. BREAKERS WILL BE 2 TO 4 FEET WITH LOCAL MAX SETS TO 6 FEET WITH A HIGH RISK OF RIP CURRENTS CONTINUING. THE SWELL FROM HURRICANE LINDA WILL LINGER INTO FRIDAY NIGHT. A HIGH SURF ADVISORY MAY BE NEEDED FOR THURSDAY AND FRIDAY FOR SOUTH FACING BEACHES. SURF AND RIP CURRENTS WILL BEGIN TO SUBSIDE OVER THE WEEKEND. && .LOX WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WARNING (SEE LAXFFALOX). EXCESSIVE HEAT WARNING (SEE LAXNPWLOX). FLASH FLOOD WATCH (SEE LAXFFALOX). && PUBLIC...KJ AVIATION...SWEET MARINE...SWEET SYNOPSIS...SETO/KJ WWW.WEATHER.GOV/LOSANGELES
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 600 AM PDT WED SEP 9 2015 CAZ034>041-044>046-051>054-059-087-088-547-548-101300- SAN LUIS OBISPO COUNTY CENTRAL COAST- SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY- SAN LUIS OBISPO COUNTY INTERIOR VALLEYS-CUYAMA VALLEY- SANTA BARBARA COUNTY SOUTH COAST-VENTURA COUNTY COAST- LOS ANGELES COUNTY COAST INCLUDING DOWNTOWN LOS ANGELES- VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS- SANTA MONICA MOUNTAINS RECREATIONAL AREA- SAN LUIS OBISPO COUNTY MOUNTAINS- SANTA BARBARA COUNTY MOUNTAINS-VENTURA COUNTY MOUNTAINS- LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE- ANTELOPE VALLEY-CATALINA ISLAND-SANTA CLARITA VALLEY- LOS ANGELES COUNTY SAN FERNANDO VALLEY- LOS ANGELES COUNTY SAN GABRIEL VALLEY- 600 AM PDT WED SEP 9 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY THE AREA WILL BAKE UNDER HAZARDOUS MUCH ABOVE NORMAL TEMPERATURES. INCREASED HUMIDITY WILL WORSE<TYPE YOUR DAY 2-7 TEXT HERE>N THE EFFECT OF THE HEAT. THERE IS A CHANCE THAT A THUNDERSTORM WILL PRODUCE FLASH FLOODING OVER THE LOS ANGELES COUNTY MOUNTAINS OR THE ANTELOPE VALLEY. * EXCESSIVE HEAT WARNING.....SEE WWUS76 KLOX - NPWLOX FOR DETAILS * * FLOOD WATCH................SEE WGUS66 KLOX - FFALOX FOR DETAILS * .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY DANGEROUS HEAT WILL CONTINUE THURSDAY. THERE WILL BE SOME COOLING FRIDAY BUT MAX TEMPS WILL REMAIN MUCH ABOVE NORMAL. * EXCESSIVE HEAT WARNING.....SEE WWUS76 KLOX - NPWLOX FOR DETAILS * .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. RORKE
The Los Angeles radar (KVTX), 70 km away, was scanning. The volume nearest the first event began at 23:12 UTC.
2 flash flood. Local standard time, as filed.
Strong thunderstorms developed over the mountains of Los Angeles county. Heavy rain from these thunderstorms generated mud and debris flows across sections of Lake Hughes Road.
Strong thunderstorms developed near the community of Llano. Heavy rain resulted in several flooded roads.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2015Every state in 2015This day in weather historyWarnings in California, September 2015
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: 596653, 596654.