The heat wave which started at the end of August continued into the first few days of September. The combination of above normal temperatures and relative humidity continued to produce excessive heat conditions across sections of Southern California.
Every event with a place to put it; 2 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 episode as NWS LOX wrote it up.
The heat wave which started at the end of August continued into the first few days of September. The combination of above normal temperatures and relative humidity continued to produce excessive heat conditions across sections of Southern California. At the end of the heat wave, 18 heat-related deaths were reported across 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 Aug 31, 8:25 PM PST, 3 hours 35 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 925 PM PDT FRI AUG 31 2007 .SHORT TERM (TONIGHT-MON)...ANOTHER VERY HOT DAY INLAND TODAY WITH MANY VALLEY AND LOWER MOUNTAIN LOCATIONS REACHING TRIPLE DIGITS AGAIN. THE OFFICIAL HOT SPOT FOR THE DISTRICT TODAY WAS AT WOODLAND HILLS WITH 109 DEGREES. ONE RECORD HIGH WAS TIED TODAY WHICH WAS AT BOB HOPE AIRPORT IN BURBANK AT 106 DEGREES. SEVERAL THUNDERSTORMS WITH VERY HEAVY RAIN DEVELOPED OVER THE SAN GABRIEL MOUNTAINS AND THE ANTELOPE VALLEY THIS AFTERNOON INTO EARLY THIS EVENING. SOME FLOODING WAS REPORTED IN THE ANTELOPE VALLEY ALONG WITH VERY GUSTY WINDS AT TIMES. THE THUNDERSTORMS HAVE SINCE DISSIPATED LEAVING MOSTLY CLEAR SKIES OVER THE REGION AND FOR THE BALANCE OF THE DISTRICT. LOW CLOUDS WERE MOVING INTO THE CENTRAL COAST WITH LOCAL DENSE FOG AS WELL...AND THIS SHOULD CONTINUE OVERNIGHT. LARGE UPPER HI EXTENDING FROM THE SOUTHERN GREAT BASIN INTO SRN CA WILL PERSIST OVER THE AREA THRU LABOR DAY. TEMPS WILL REMAIN EXCESSIVELY HOT SAT AND POSSIBLE EACH AFTERNOON THRU LABOR DAY. AN EXCESSIVE HEAT WARNING REMAINS IN EFFECT THRU SAT FOR THE VALLEYS AND MOUNTAINS OF VENTURA AND LOS ANGELES COUNTIES. THIS WARNING MAY NEED TO BE EXTENDED OVER THE WEEKEND AS WELL. PLEASE SEE LAXNPWLOX FOR DETAILS ON THE EXCESSIVE HEAT WARNING. NEEDLESS TO SAT...THE COOLEST PLACE OVER THE HOLIDAY WEEKEND WILL BE AT THE BEACHES...WITH HIGHS GENERALLY IN THE 70S EXCEPT EVEN COOLER FOR THE BEACHES ALONG THE CENTRAL COAST. MONSOONAL MOISTURE IS EXPECTED TO CONTINUE TO FILTER INTO THE AREA FROM THE E AND SE. WITH ENOUGH INSTABILITY EACH AFTERNOON...IT LOOKS LIKE A SLIGHT CHANCE OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS WILL CONTINUE MAINLY FOR THE MOUNTAINS AND ANTELOPE VALLEY...THOUGH SOME OF THIS ACTIVITY COULD DRIFT TO THE VALLEYS AND COAST OF VTU AND L.A. COUNTIES BY MON. EVEN SO...MOST AREAS WILL REMAIN HOT AND DRY THRU LABOR DAY. ...FROM PREVIOUS DISCUSSION... .LONG TERM (TUE-FRI)...BOTH GFS AND ECMWF ARE IN FAIRLY GOOD AGREEMENT WITH OVERALL PATTERN THROUGH FRI. UPR LVL HIGH BEGINS TO BUILD NORTH AND WEST OVER THE EASTERN PACIFIC. AND WITH THIS...A TROF WILL DIG SOUTH ON THE EASTERN PERIPHERAL OF THE HIGH FROM IDAHO INTO NEVADA ON WED. AS HIGH PRESSURE WEAKENS OVER THE AREA...THICKNESS LVLS WILL LOWER AS WELL AS 950 MB TEMPS. THIS WILL TRANSLATE INTO A COOLING TREND THROUGH THE EXTENDED PERIOD. TEMPS WILL CONTINUE TO BE ABOVE NORMAL THROUGH THURSDAY...THEN BE NEAR NORMAL BY FRI. COASTAL AREAS SHOULD CONTINUE TO BE MILD OVERALL. MODELS DO INDICATE THAT 700MB MID LVL MOISTURE COULD CONTINUE SO EXPECT A CONTINUATION OF CU BUILDUPS ACROSS THE MOUNTAINS AT THE LEAST. && .AVIATION...01/0418Z...IFR CIGS/VSBYS WILL AFFECT KSMX AND KSBP OVERNIGHT INTO SAT MORNING. OTHERWISE...GENERALLY VFR CONDITIONS SHOULD PREVAIL OVER THE DISTRICT THRU SAT. THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS AROUND KPMD AND KWJF SAT AFTERNOON. KLAX...VFR CONDITIONS EXPECTED THRU SAT WITH A TYPICAL AFTERNOON SEABREEZE NEAR 10 KT. KBUR...VFR THRU SAT WITH A NORMAL AFTERNOON SEABREEZE. .LOX WATCHES/WARNINGS/ADVISORIES... EXCESSIVE HEAT WARNING (SEE LAXNPWLOX). SMALL CRAFT ADVISORY (SEE LAXCWFLOX). HIGH RIP CURRENT RISK (SEE LAXSRFLOX). && PUBLIC...KAPLAN/SIRARD AVIATION...SIRARD WWW.WEATHER.GOV/LOSANGELES
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 350 PM PDT FRI AUG 31 2007 CAZ034>041-044>047-051>054-059-087-088-011300- 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- LOS ANGELES COUNTY VALLEYS-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- 334 PM PDT FRI AUG 31 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA. .DAY ONE... TODAY WIDESPREAD EXCESSIVE HEAT WILL PERSIST ACROSS THE VALLEYS AND MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES TODAY. MANY VALLEY LOCATIONS WILL EXPERIENCE HEAT INDEX VALUES OF 106 TO 112 DEGREES...WHILE LOWER MOUNTAIN ELEVATIONS WILL HAVE READINGS BETWEEN 100 AND 106 DEGREES. HIGH RIP CURRENT RISK WILL BE AFFECTING SOUTH AND SOUTHWEST BEACHES TODAY AS AN INCREASING SOUTH SWELL WITH A LONG PERIOD MOVES INTO THE COASTAL WATERS. * EXCESSIVE HEAT WARNING.....SEE WWUS76 KLOX - NPWLOX FOR DETAILS * * HIGH RIP CURRENT RISK......SEE FZUS56 KLOX - SRFLOX FOR DETAILS * .DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY WIDESPREAD EXCESSIVE HEAT WILL PERSIST ACROSS THE VALLEYS AND MOUNTAINS OF LOS ANGELES AND VENTURA COUNTIES SATURDAY THROUGH SUNDAY. HEAT INDEX VALUES MAY RISE AND RANGE FROM 106 TO 113 DEGREES...WHILE LOWER MOUNTAIN ELEVATIONS MAY HAVE READINGS BETWEEN 100 AND 107 DEGREES. OTHERWISE HAZARDOUS WEATHER IS NOT EXPECTED MONDAY THROUGH THURSDAY. HIGH RIP CURRENT RISK WILL BE AFFECTING SOUTH AND SOUTHWEST BEACHES ON SATURDAY AS AN INCREASING SOUTH SWELL WITH A LONG PERIOD MOVES INTO THE COASTAL WATERS. * EXCESSIVE HEAT WARNING.....SEE WWUS76 KLOX - NPWLOX FOR DETAILS * * HIGH RIP CURRENT RISK......SEE FZUS56 KLOX - SRFLOX FOR DETAILS * .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. KAPLAN
The national radar mosaic for the moment the first event began.
12 excessive heat. Local standard time, as filed.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the interior valleys of Ventura county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the coastal valleys of Ventura county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the Santa Monica Mountains. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the lower valleys of Los Angeles county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the Santa Clarita Valley. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the mountains of Ventura county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the mountains of Los Angeles county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the valleys of San Luis Obispo county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the Cuyama Valley. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the mountains of San Luis Obispo county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat conditions across the mountains of Santa Barbara county. Heat index values between 105 and 112 were reported.
The combination of above normal temperatures and relative humidity produced excessive heat across the coastal plain of Los Angeles county. Heat index values between 105 and 112 degrees were reported.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2007Every state in 2007This day in weather historyWarnings in California, September 2007
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: 52584, 52585, 52587, 52589, 52591, 52592, 52593, 52582, 52583, 52594, 52595, 52597.