The combination of remnant moisture from Hurricane Blanca and an upper level low pressure system off the Central California coast brought strong thunderstorms to interior sections of San Luis Obispo and Santa Barbara counties. Flash flooding and mud/debris flows were reported just east of the community of Cuyama.
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The episode as NWS LOX wrote it up.
The combination of remnant moisture from Hurricane Blanca and an upper level low pressure system off the Central California coast brought strong thunderstorms to interior sections of San Luis Obispo and Santa Barbara counties. Flash flooding and mud/debris flows were reported just east of the community of Cuyama.
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 10, 4:15 PM PST, 2 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 515 PM PDT WED JUN 10 2015 UPDATED AVIATION SECTION .SYNOPSIS... WITH LOW PRESSURE MOVING THROUGH THE AREA AND TROPICAL MOISTURE STILL IN PLACE...THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS OVER THE MOUNTAINS TODAY. THERE IS ALSO A SLIGHT CHANCE OF THUNDERSTORMS OVER THE MOUNTAINS ON FRIDAY. SEASONABLE CONDITIONS WITH NIGHT THROUGH MORNING LOW CLOUDS AND FOG ALONG THE COASTAL PLAIN WILL LIKELY RETURN FOR THE WEEKEND AND NEXT WEEK. && .SHORT TERM (TODAY-SAT)...LINGERING MOISTURE AND INSTABILITY FROM BLANCA COMBINED WITH THE UPPER LOW NEAR PT CONCEPTION IS GENERATING SOME BUILDUPS AND ISOLATED STORMS THIS AFTERNOON. WINDS ALOFT FAIRLY STRONG FROM THE WEST/SOUTHWEST ACROSS LA/VENTURA COUNTIES BUT WEAKER CLOSER TO THE LOW SO IF THERE'S A CHANCE FOR SOME ISOLATED FLOODING FROM THESE STORMS IT WOULD BE ACROSS SLO/SBA COUNTY MTNS. PWATS STILL PRETTY HIGH SO CERTAINLY PLENTY OF MOISTURE TO GENERATE SOME HEAVY RAIN. ACTIVITY EXPECTED TO TAPER OFF AFTER SUNSET WITH A STANDARD MARINE LYR PATTERN SETTING IN OVERNIGHT. WITH THE UPPER LOW MOVING EAST TONIGHT WE SHOULD SEE QUIET WEATHER THURSDAY WITH STILL A DEEP MARINE LYR IN PLACE. PWATS STILL ABOVE NORMAL BUT LOWER THAN TODAY SO IT SHOULDN'T FEEL QUITE AS STICKY AS THE LAST COUPLE DAYS. TEMPERATURE TRENDS WILL VARY FROM SIMILAR NORTH OF PT CONCEPTION TO SLIGHTLY WARMER IN THE SOUTH WITH BETTER CLEARING OF LOW CLOUDS EXPECTED. ON FRIDAY WE GET A LITTLE MOISTURE CREEPING IN FROM THE NORTHEAST WITH SOME UPPER LEVEL ENERGY AS WELL. MOISTURE AND INSTABILITY DON'T LOOK QUITE AS GOOD AS THEY DID ON YESTERDAY'S MODELS BUT STILL ENOUGH FOR A SLIGHT CHANCE OF AFTERNOON CONVECTION IN THE MTNS. COAST/VALLEYS STILL DEALING WITH NIGHT/MORNING MARINE LYR AND NOT MUCH CHANGE IN DAYTIME HIGHS EXPECTED. ON SATURDAY WE GET A LITTLE RIDGE POPPING UP THAT WILL WARM INLAND AREAS UP BUT PROBABLY NOT MUCH CHANGE FOR THE COAST DUE TO THE PERSISTENT ONSHORE FLOW AND MARINE LYR. .LONG TERM (SUN-WED)...PRETTY QUIET NEXT WEEK WITH A SLIGHT WARMING TREND FOR INLAND AREAS. WARMER COASTAL VALLEYS SHOULD BE CLOSE TO 90 EACH DAY WHILE INTERIOR MTNS AND ANTELOPE VALLEY WARM UP INTO THE MID 90S. HOWEVER NOT MUCH CHANGE FOR THE COAST. SOME COOLING EXPECTED THE LATTER HALF OF NEXT WEEK AS A WEAK TROF MOVES INTO THE PAC NW. && .AVIATION...10/0015Z. AT 0000Z...THE MARINE INVERSION AT KLAX WAS BASED AROUND 1000 FEET. THE TOP OF THE INVERSION WAS AROUND 3000 FEET WITH A TEMPERATURE OF 17 DEGREES CELSIUS. NORTH OF POINT CONCEPTION...LOW TO MODERATE CONFIDENCE IN THE CURRENT FORECAST. IFR CONDITIONS WILL SPREAD INTO COASTAL TERMINALS BETWEEN 03Z AND 08Z...THEN DETERIORATE TO LIFR THROUGH 10Z. CONDITIONS SHOULD IMPROVE ONE CATEGORY BETWEEN 15Z AND 16Z. VFR CONDITIONS SHOULD REDEVELOP BETWEEN 16Z AND 18Z. SOUTH OF POINT CONCEPTION...IFR TO MVFR CONDITIONS AT THE BEACHES WILL SPREAD OVER THE AREA THROUGH 09Z. PREDOMINANT MVFR CONDITIONS SHOULD DEVELOP BY 09Z. IT IS LIKELY THAT COASTAL TERMINALS WILL STRUGGLE TO CLEAR ON THURSDAY. KLAX...LOW TO MODERATE CONFIDENCE IN THE CURRENT FORECAST. THERE IS A 70 PERCENT CHANCE OF MVFR CONDITIONS DETERIORATING TO IFR BETWEEN 01Z AND 06Z. OTHERWISE...MVFR CONDITIONS SHOULD PERSIST THROUGH AT 20Z...OR AS LATE AS 22Z. KBUR...LOW TO MODERATE CONFIDENCE IN THE CURRENT FORECAST. MVFR CONDITIONS WILL SPREAD BACK IN TO KBUR BETWEEN 05Z AND 09Z. VFR CONDITION SHOULD REDEVELOP BETWEEN 18Z AND 20Z. && .MARINE...10/200 PM. FOR THE OUTER WATERS...MODERATE TO HIGH CONFIDENCE IN NORTHWEST WINDS REMAINING BELOW SMALL CRAFT ADVISORY LEVELS THROUGH THE WEEKEND. LOCAL GUSTS TO 25 KT WILL BE POSSIBLE IN THE AFTERNOON AND EVENING HOURS AROUND POINT CONCEPTION...BUT NOT WIDESPREAD ENOUGH TO WARRANT ANY ADVISORIES. FOR THE INNER WATERS...HIGH CONFIDENCE IN WEST TO NORTHWEST WINDS REMAINING BELOW SMALL CRAFT ADVISORY LEVELS THROUGH THE WEEKEND. && .LOX WATCHES/WARNINGS/ADVISORIES... NONE. && PUBLIC...MW AVIATION...HALL MARINE...SWEET SYNOPSIS...SUKUP WWW.WEATHER.GOV/LOSANGELES
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 600 AM PDT WED JUN 10 2015 CAZ034>041-044>046-051>054-059-087-088-547-548-111300- 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 JUN 10 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE MOUNTAINS AND THE INTERIOR THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE MOUNTAINS AND THE INTERIOR FRIDAY AFTERNOON AND EVENING. RORKE
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OXNARD CA
331 PM PDT WED JUN 10 2015
CAZ037-051-102300-
SAN LUIS OBISPO COUNTY INTERIOR VALLEYS CA-
SAN LUIS OBISPO COUNTY MOUNTAINS CA-
331 PM PDT WED JUN 10 2015
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN SAN LUIS OBISPO
COUNTY UNTIL 400 PM PDT...
AT 331 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG AND NEARLY
STATIONARY THUNDERSTORM NEAR SHANDON 25 MILES EAST OF PASO ROBLES.
DIME SIZED HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THIS STORM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS.
HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.
&&
LAT...LON 3561 12019 3561 12009 3553 12009 3552 12007
3551 12007 3551 12005 3548 12003 3548 12002
3547 12001 3547 12000 3544 11999 3544 11991
3541 11988 3534 12038 3567 12054 3575 12020
TIME...MOT...LOC 2231Z 287DEG 6KT 3553 12023
RKThe Los Angeles radar (KVTX), 67 km away, was scanning. The volume nearest the first event began at 00:18 UTC.
1 flash flood. Local standard time, as filed.
Strong thunderstorms produced flash flooding and mud/debris flows in southeast San Luis Obispo county. California Highway Patrol reported flash flooding at the intersection of Highway 33 and Highway 166.
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: 592745.