From August 29th through the end of the month, abundant monsoonal moisture produced strong thunderstorms across the mountains and deserts of Southern California.
Every event with a place to put it. 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.
From August 29th through the end of the month, abundant monsoonal moisture produced strong thunderstorms across the mountains and deserts of Southern California.
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, 1:55 PM PST, 2 hours 16 minutes earlier.
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 255 PM PDT FRI AUG 31 2007 .SHORT TERM...(TONIGHT-MON) TEMPERATURES CONTINUED TO HEAT UP ONCE AGAIN TODAY. DOWNTOWN ALREADY AT 97 DEGREES AT 2 PM. MOST ALL OTHER AREAS ARE ON TRACK TO BE COMPARABLE TO YESTERDAYS TEMPS. THE RECORD FOR DOWNTOWN LOS ANGELES THIS DAY IS 103 DEGREES SET IN 1967. DONT EXPECT THAT RECORD TO BE BROKEN TODAY. HOWEVER THERE COULD BE SOME RECORDS BROKEN OR TIED BEFORE THE DAY IS DONE. WITH UPR LVL HIGH WELL IN PLACE ACROSS THE SOUTHERN CA AND AZ...TEMPS WILL CONTINUE TO SIZZLE ACROSS THE INTERIOR SECTIONS INCLUDING THE VALLEYS....LOWER MOUNTAIN ELEVATIONS AND THE ANTELOPE VALLEY. SATURDAY AND SUNDAY WILL CONTINUE TO BE JUST AS HOT. THE EXCESSIVE HEAT WARNING WAS EXTENDED THROUGH SATURDAY AND WILL LIKELY HAVE BE EXTENDED THROUGH SUNDAY AS WELL. BOTH WRF AND GFS ARE IN PRETTY GOOD AGREEMENT IN REGARDS TO CONVECTIVE PARAMETERS OVER THE NEXT SEVERAL DAYS. THERE WILL BE PLENTY OF MID LVL MOISTURE ACROSS THE LOCAL MOUNTAINS AND THE ANTELOPE VALLEY AS ANOTHER SURGE OF MID LVL MOISTURE MOVES INTO THE AREA SUN AND MON. THEREFORE ADDED 20 PERCENT POPS THROUGH MONDAY EVENING. IN FACT...ADDED SLIGHT CHANCE POPS FOR SUNDAY NIGHT ACROSS THE LA/VTA VALLEYS AND COASTAL AREAS AS UPPER LVL DEFORMATION ZONE IS FORECAST TO MOVE ACROSS THE AREA SUNDAY EVENING. BOTH SUN AND MON INDICATE A BROAD AREA OF LIFTED INDEX VALUES BETWEEN -2 TO NEAR -4 ACROSS INTERIOR SECTIONS...WITH K-INDEX VALUES NEAR 40 (VERY CONVECTIVE) FOR THIS AFTERNOON AND AGAIN ON SUN AND MON AFTERNOONS. LATEST SOUNDER PWAT GOES IMAGERY INDICATED 1.5 INCHES ACROSS MUCH OF SOUTHERN CAL WHILE WRF MODEL DATA CONCURS. BOTTOM LINE IS THAT THIS PATTERN WILL CONTINUE THROUGH LABOR DAY WITH RECORD OR NEAR RECORD HOT TEMPS AND MUGGY CONDITIONS. .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...31/1820Z GOOD CONFIDENCE IN MOST LOCATIONS SOUTH OF POINT CONCEPTION REMAINING CLEAR OVERNIGHT...EXCEPT FOR KOXR WHICH WILL BE AFFECTED BY A FINGER OF FOG PUSHING THROUGH THE SANTA BARBARA CHANNEL. THE LOW CLOUDS AND FOG WILL BE LOCALLY DENSE ON THE CENTRAL COAST. KLAX...CLEAR THROUGH SATURDAY WITH NORMAL SEA BREEZES. KBUR...CLEAR THROUGH SATURDAY WITH NORMAL SEA BREEZES. .LOX WATCHES/WARNINGS/ADVISORIES... EXCESSIVE HEAT WARNING (SEE LAXNPWLOX). SMALL CRAFT ADVISORY (SEE LAXCWFLOX). HIGH RIP CURRENT RISK (SEE LAXSRFLOX). && PUBLIC...KAPLAN AVIATION...SWEET 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.
1 flash flood. Local standard time, as filed.
Strong monsoonal thunderstorms produced flash flooding across the Antelope Valley. A trained spotter in the Palmdale area reported flash flooding from the intersection of 180th St and Palmdale Boulevard to the San Bernardino county line.
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, August 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: 47283.