A push of monsoonal moisture produced thunderstorms across the Antelope Valley. Some of these thunderstorms were severe, producing damaging wind gusts which downed power lines.
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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.
A push of monsoonal moisture produced thunderstorms across the Antelope Valley. Some of these thunderstorms were severe, producing damaging wind gusts which downed power lines.
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 Aug 19, 12:49 PM PST, 2 hours 41 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 149 PM PDT MON AUG 19 2013 .SYNOPSIS... ISOLATED THUNDERSTORMS OVER THE INLAND AREAS WILL END LATE THIS EVENING. A LOW PRESSURE SYSTEM OVER THE EASTERN PACIFIC THIS AFTERNOON WILL GRADUALLY SHIFT NORTHEAST TUEDAY AND MOVE OVER NORTHERN CALIFORNIA EARLY THURSDAY. MONSOON MOISTURE IS EXPECTED TO MOVE NORTH SATURDAY THROUGH NEXT WEEK MONDAY. AND A SLIGHT CHANCE OF THUNDERSTORMS ARE EXPECTED OVER THE HIGHER ELEVATIONS AND DESERT EACH AFTERNOON SATURDAY THROUGH MONDAY. && .SHORT TERM (TODAY-THU)...THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE EAST PORTION OF THE CWA THIS AFTERNOON. WITH A STRONG MID LEVEL CIRCULATION CENTER WEST OF POINT CONCEPTION THE THUNDERSTORMS WILL MOVE NORTHWEST OVER SANTA BARBARA...SAN LUIS OBISPO AND VENTURA COUNTIES AND NORTH OVER LOS ANGELES COUNTY AND BETWEEN 15-20KT THROUGH THE EVENING. DO NOT EXPECT THE ACTIVITY TO CONTINUE OVERNIGHT AS A RELATIVELY STRONG MID LEVEL CAP DEVELOPS WHICH WILL LIKELY INHIBIT DEVELOPMENT. OTHERWISE WILL CONTINUE DRY TUESDAY. CONFIDENCE IS RELATIVELY HIGH AND AS THE LOW SHIFTS WEST A MID LEVEL CAP WILL DEVELOP AND STABILITY WILL INCREASE OVER THE AREA. WHILE THE STABILITY INCREASES A MID LEVEL CLOUD FIELD MAY DEVELOP AND MOVE OVER THE AREA WITHIN MODERATE SOUTHWEST WINDS. TEMPERATURES WERE 5 TO 15 DEGREES COOLER THAN SUNDAY AT THIS TIME OVER VENTURA AND LOS ANGELES COUNTIES AND AREAS OF SANTA BARBARA AND SAN LUIS OBISPO COUNTIES. A MIXED TREND IS EXPECTED TUESDAY AND TEMPERATURES WILL DIFFER BY AS MUCH AS 3 DEGREES TUEDAY. THEN A SLIGHT WARMING TREND IS EXPECTED WED THROUGH THU OVER THE ENTIRE AREA AND TEMPERATURES WILL RANGE 4 TO 8 DEGREES BELOW NORMAL NEAR THE COAST TO SEVERAL DEGREES ABOVE NORMAL INLAND. .LONG TERM (FRI-MON)...HAVE INCLUDED A SLIGHT CHANCE OF THUNDERSTORMS OVER THE VENTURA...LOS ANGELES COUNTY MOUNTAINS AND ANTELOPE VALLEY EACH AFTERNOON SATURDAY THROUGH MONDAY. THERE IS LOW CONFIDENCE IN THE ENSEMBLE SATURDAY THOUGH CONFIDENCE INCREASES THROUGH THE PERIOD. AND LATEST ANALOG GUIDANCE INDICATED HIGHEST POPS MONDAY AFTERNOON. LATEST OPERATIONAL GFS INDICATED MID LEVEL MOISTURE DEEPENING OVER THE AREA SATURDAY THROUGH MONDAY WITH THE OF THE MOISTURE ARRIVING MONDAY. THOUGH THE LATEST RUN DIFFERED FROM PREVIOUS RUNS AND HAD CENTERED THE MOISTURE OVER THE AREA MON MORNING WHERE THE PREVIOUS RUNS CENTERED THE MOISTURE OFF THE CENTRAL BAJA COAST. CONFIDENCE IS LOW AND HAVE INCLUDED A SLIGHT CHANCE POPS EACH AFTERNOON SAT THROUGH MON. A COOLING TREND IS EXPECTED THROUGH THE PERIOD WITH THE GREATEST COOLING SUNDAY THROUGH MONDAY WHERE TEMPERATURE WILL RANGE 5 TO 10 DEGREES BELOW NORMAL MONDAY. && .AVIATION...19/1800. CLEARING TIMES FOR TODAY HAVE BEEN DELAYED A BIT BASED ON THE LATEST SATELLITE TRENDS IN COASTAL SECTIONS SOUTH OF POINT CONCEPTION. THE MARINE LAYER DEPTH RANGES FROM 900 TO 1400 FEET NORTH TO SOUTH. SKIES WILL BE CLEAR TO PARTLY CLOUDY THIS AFTERNOON EXCEPT IN THE ANTELOPE VALLEY WHERE THERE IS A DECENT CHANCE OF THUNDERSTORMS IN THE AFTERNOON AND EVENING. MARINE CLOUDS WILL RETURN TO THE COASTAL SECTIONS WITH A SLIGHTLY DEEPER MARINE LAYER TONIGHT AND LAST INTO TUESDAY MORNING. KLAX...GOOD CONFIDENCE IN IFR TO MVFR CONDITIONS FROM LATE THIS EVENING THROUGH TUESDAY MORNING. THERE IS A 30 PERCENT CHANCE OF THE LOW CLOUDS ARRIVING LATER THAN FORECAST IN THE 18Z TAF. KBUR...HIGH CONFIDENCE IN VFR CONDITIONS THROUGH TUESDAY. THERE IS A 20 PERCENT CHANCE OF THE MARINE LAYER SNEAKING INTO THE AIRFIELD EARLY TUESDAY MORNING. && .FIRE WEATHER... A CUTOFF LOW PRESSURE SYSTEM OFF THE CENTRAL COAST WILL REMAIN NEARLY STATIONARY THROUGH TUESDAY. THIS LOW PRESSURE SYSTEM CONTINUES TO DRAW UP MOISTURE INTO SOUTHERN AND CENTRAL CALIFORNIA. MOISTURE HAS INCREASED ACROSS THE FORECAST AREA THIS MORNING...ESPECIALLY LOS ANGELES COUNTY. TH GREATEST THREAT OF THUNDERSTORM ACTIVITY WITH MORE NUMEROUS LIGHTNING COVERAGE IS EXPECTED TODAY ACROSS THE LOS ANGELES COUNTY MOUNTAINS AND ANTELOPE VALLEY WHERE THERE WILL BE THE GREATEST MOISTURE AND INSTABILITY. MOST OF THESE STORMS ACROSS LOS ANGELES COUNTY ARE EXPECTED TO BE WET...HOWEVER ISOLATED DRY LIGHTNING STRIKES WILL BE POSSIBLE ACROSS THE PERIPHERY OF STORMS. THERE IS ALSO A SLIGHT CHANCE OF THUNDERSTORMS TODAY FOR OTHER MOUNTAINS AREAS...AS WELL AS THE SANTA CLARITA VALLEY AND CUYAMA VALLEY. FROM VENTURA COUNTY WESTWARD...THE ATMOSPHERE IS SOMEWHAT DRIER AND RAINFALL AMOUNTS ARE EXPECTED TO BE LESS. IF ANY STORMS DEVELOP FROM VENTURA COUNTY WESTWARD...THEY WILL HAVE A GREATER POTENTIAL FOR DRY LIGHTNING STRIKES. ANY THUNDERSTORMS THAT DEVELOP TODAY WILL ALSO HAVE THE POTENTIAL TO PRODUCE STRONG GUSTY WINDS AND HAIL. THE AIR MASS IS EXPECTED TO BE DRIER ON TUESDAY. && .LOX WATCHES/WARNINGS/ADVISORIES... SPECIAL WEATHER STATEMENT (SEE LAXSPSLOX). && PUBLIC...30 AVIATION...SWEET FIRE...GOMBERG WWW.WEATHER.GOV/LOSANGELES
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 600 AM PDT MON AUG 19 2013 CAZ034>041-044>046-051>054-059-087-088-547-548-201300- 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 MON AUG 19 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY AND TONIGHT THERE IS A SLIGHT CHANCE OF THUNDERSTORMS TODAY ACROSS THE LOS ANGELES AND VENTURA COUNTY MOUNTAINS AS WELL AS THE ANTELOPE VALLEY. ANY THUNDERSTORM THAT DOES DEVELOP COULD PRODUCE GUSTY WINDS...LOCAL FLOODING...SMALL HAIL AND DANGEROUS LIGHTNING. .DAYS TWO THROUGH SEVEN... TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. RORKE
The Edwards AFB radar (KEYX), 71 km away, was scanning. The volume nearest the first event began at 23:30 UTC.
1 thunderstorm wind. Local standard time, as filed.
California Highway Patrol reported downed power lines along 4th Street East and East Avenue L4 due to thunderstorm winds. Wind gusts were estimated to be around 60 MPH.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2013Every state in 2013This day in weather historyWarnings in California, August 2013
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: 467096.