Lingering subtropical moisture produced strong thunderstorms and flash flooding across the mountains of Southern California. Reports of significant mud/debris flows as well as flash flooding were reported by law enforcement.
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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.
Lingering subtropical moisture produced strong thunderstorms and flash flooding across the mountains of Southern California. Reports of significant mud/debris flows as well as flash flooding were reported by law enforcement.
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 Jun 12, 12:00 PM PST, 1 hour 15 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 100 PM PDT FRI JUN 12 2015 .SYNOPSIS... THUNDERSTORMS DEVELOPING OVER THE MOUNTAINS THIS AFTERNOON THROUGH EARLY IN THE EVENING. THESE THUNDERSTORMS WILL RESULT IN A POTENTIAL FOR FLASH FLOODING. OTHERWISE A TROUGH OF LOW PRESSURE OVER THE REGION WILL LINGER THROUGH EARLY SATURDAY...KEEPING A PERSISTENT MARINE LAYER AND ONSHORE FLOW IN PLACE THROUGH SATURDAY MORNING. HIGH PRESSURE WILL BEGIN TO BUILD OVER THE AREA SATURDAY AFTERNOON...PRODUCING A WARMING AND DRYING TREND THROUGH THE WEEKEND. && .SHORT TERM (TODAY-MON)...THUNDERSTORMS FIRING UP ON SCHEDULE WITH THE BULK OF THE ACTIVITY SO FAR OVER VENTURA COUNTY AND EXTREME ERN SBA COUNTY. MODELS DID A GOOD JOB INDICATING THIS WOULD BE THE FOCUS AREA TODAY BUT CERTAINLY ENOUGH INSTABILITY AND MOISTURE TO KEEP A RISK GOING FOR LA MTNS/AV AS WELL AS SOUTHEASTERN SLO COUNTY. FLOODING THE MAIN RISK TODAY WITH PWATS AROUND 1.3" AND STEERING WINDS UNDER 10 KT FROM THE NORTH. ACTIVITY EXPECTED TO SUBSIDE SHORTLY AFTER SUNSET. HOWEVER, MODELS STILL INDICATING FAVORABLE CONDITIONS FOR CONVECTIVE DEVELOPMENT SATURDAY AFTERNOON, ESPECIALLY ERN LA COUNTY, WITH LI'S AROUND -4 AND 850 DEWPOINTS AROUND -13. SO SOME SLIGHT CHANCE POPS HAVE BEEN ADDED TO THAT AREA. NOT AS MUCH OF A CHANCE ACROSS VENTURA COUNTY SATURDAY AS THE AIR MASS IS MUCH DRIER THERE, BUT SHOULD AT LEAST SEE SOME CU IN THE AFTERNOON. MARINE LYR EXPECTED TO SHRINK A BIT OVERNIGHT AS HEIGHTS START TO BUILD AND WARMER AIR MOVES IN ALOFT FROM THE WEST. LOW CLOUDS SHOULD STILL PUNCH WELL INTO THE VALLEYS TONIGHT, BUT WITH EARLIER CLEARING. HOWEVER, A STRONG INVERSION AND CONTINUED ONSHORE FLOW WILL LIKELY KEEP JUNE GLOOM CONDITONS AT MANY BEACHES THROUGH THE WEEKEND. DAYTIME HIGHS WILL START WARMING SATURDAY, MAINLY INLAND, WITH A SLOW WARMING TREND CONTINUING THROUGH MONDAY. .LONG TERM (TUE-FRI)...MODELS MAINTAIN STRONG HIGH PRESSURE ACROSS THE AREA THROUGH MOST OF THE WEEK FOR DRY WEATHER AND VERY WARM TEMPS INLAND. COASTAL AREAS EXPECTED TO REMAIN UNDER THE INFLUENCE OF THE MARINE LYR, AND IT'S VERY POSSIBLE THAT BEACH CLEARING WILL REMAIN LIMITED MOST OF THE WEEK, ESPECIALLY NORTH AND WEST OF MALIBU. ANTELOPE VALLEY HIGHS EXPECTED TO REACH 100 BY LATER IN THE WEEKEND AND REMAIN THAT WAY MOST OF THE WEEK. GFS BRINGS 40C 950 TEMPS NEAR THE LA/SBD COUNTY LINE BY WED AND THU, WHICH IF TRUE COULD LEAD TO TEMPS CLOSER TO 105, BUT ECMWF IS NOT QUITE AS WARM SO WILL LEAVE TEMPS AROUND 100 FOR HIGHS THERE AND MID 90S FOR THE WARMER COASTAL VALLEYS. && .AVIATION...12/1800Z... AT 1730Z...THE MARINE INVERSION AT KLAX WAS BASED AT 2500 FEET. THE TOP OF THE INVERSION WAS AT 4800 FEET WITH A TEMPERATURE OF 22 DEGREES CELSIUS. OVERALL...MODERATE CONFIDENCE IN THE 18Z TAFS. LITTLE CHANGE IS EXPECTED IN THE MARINE LAYER DEPTH AND OVERALL WEATHER PATTERN FOR THE NEXT 24 HOURS...SO WENT WITH A PERSISTENCE FORECAST. CLEARING AND ARRIVAL TIMES OF STRATUS/FOG MAY BE OFF BY +/- 2 HOURS FOR COASTAL AND VALLEY SITES. THERE IS A SLIGHT CHANCE OF THUNDERSTORMS FOR KPMD AND KWJF THIS AFTERNOON...WITH A BETTER CHANCE OF THUNDERSTORMS OVER THE MOUNTAINS. OUTFLOW FROM THUNDERSTORMS COULD DELAY THE MARINE LAYER CLOUD FORMATION FOR COASTAL AND VALLEY TAF SITES THIS EVENING. KLAX...MODERATE CONFIDENCE IN 18Z TAF. ARRIVAL AND CLEARING TIMES COULD BE OFF BY +/- 2 HOURS. THERE IS A 30 PERCENT CHANCE THAT CONDITIONS WILL REMAIN MVFR TONIGHT AND NOT FALL INTO IFR. THERE IS A 20 PERCENT CHANCE OF NO CLEARING THIS AFTERNOON. KBUR...MODERATE CONFIDENCE IN 18Z TAF. ARRIVAL AND CLEARING TIMES COULD BE OFF BY +/- 2 HOURS. THERE IS A 30 PERCENT CHANCE THAT CONDITIONS WILL REMAIN MVFR TONIGHT AND NOT FALL INTO IFR. THERE IS A VERY SLIGHT CHANCE THAT A THUNDERSTORM WILL DRIFT OFF THE MOUNTAINS...BUT THE CHANCE OF THAT IS LESS THAN 10 PERCENT. && .MARINE... 12/830 AM PATCHY DENSE FOG WITH VISIBILITY 1 NM OR LESS WILL BE POSSIBLE THIS MORNING...ESPECIALLY FOR THE COASTAL WATERS N OF POINT CONCEPTION WHERE A MARINE WEATHER STATEMENT IS IN PLACE. MODERATE TO HIGH CONFIDENCE THAT WINDS AND SEAS WILL REMAIN BELOW SMALL CRAFT ADVISORY CRITERIA (SCA) THROUGH AT LEAST SATURDAY...OTHER THAN SOME LOCAL GUSTS TO 25 KT AROUND POINT CONCEPTION AND IN THE VICINITY OF THE CHANNEL ISLANDS. SEAS COULD APPROACH 10 FT BY ACROSS THE NORTHERN OUTER WATERS BY SATURDAY EVENING DUE TO STRONG WINDS OFF THE NORTHERN CA COAST. WIDESPREAD SCA CONDITIONS ACROSS THE OUTER WATERS AND WESTERN PORTIONS OF THE INNER WATERS WILL BECOME MORE LIKELY BY EARLY NEXT WEEK AS NW WINDS INCREASE. && .LOX WATCHES/WARNINGS/ADVISORIES... FLOOD WATCH (SEE LAXFFALOX). && PUBLIC...MW AVIATION/MARINE...SUKUP SYNOPSIS...SMITH WWW.WEATHER.GOV/LOSANGELES
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 915 AM PDT FRI JUN 12 2015 CAZ034>041-044>046-051>054-059-087-088-547-548-131300- 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- 915 AM PDT FRI JUN 12 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY THUNDERSTORMS ARE EXPECTED IN THE MOUNTAINS TODAY AND SOME OF THOSE COULD SPILL OVER INTO THE FOOTHILLS. HEAVY RAIN WITH THUNDERSTORMS IN THE MOUNTAINS COULD RESULT IN FLASH FLOODING. * FLASH FLOOD WATCH.........SEE WGUS66 KLOX - FFALOX FOR DETAILS * .DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MW
The Los Angeles radar (KVTX), 38 km away, was scanning. The volume nearest the first event began at 21:14 UTC.
2 flash flood. Local standard time, as filed.
Strong thunderstorms produced flash flooding in the mountains of Ventura County. The Ventura County Sheriff reported flash flooding at the intersection of Lockwood Valley Road and Boy Scout Camp road.
Strong thunderstorms produced flash flooding and mud/debris flows across the Antelope Valley. California Highway Patrol reported flash flooding along Largo Vista Road. Two vehicles were trapped by 2 to 4 feet of mud.
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, June 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: 592746, 592750.