From the 29th through the 31st, strong high pressure built over the southwest United States. With this pattern, above normal temperatures developed across the mountains and valleys of Southern California. An influx of monsoonal moisture from northern Mexico increased the relative humidity across the area. The combination of very hot temperatures and increased relative humidity produce heat index values between 105 and 112 degrees. The excessive heat resulted in numerous heat-related injuries and deaths. The heat wave extended into the first few days of September.

Excessive Heat in VENTURA COUNTY MOUNTAINS, CALIFORNIA
From 31-AUG-07 08:00:00 to 31-AUG-07 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The combination of above normal temperatures and relative humidity produced excessive heat across the mountains of Ventura county. Heat index values between 105 and 112 degrees were reported.

Excessive Heat in VENTURA COUNTY INTERIOR VALLEYS, CALIFORNIA
From 31-AUG-07 08:00:00 to 31-AUG-07 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The combination of above normal temperatures and relative humidity produced excessive heat across the interior valleys of Ventura county. Heat index values between 105 and 112 degrees were reported.

Excessive Heat in VENTURA COUNTY COASTAL VALLEYS, CALIFORNIA
From 31-AUG-07 08:00:00 to 31-AUG-07 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The combination of above normal temperatures and relative humidity produced excessive heat across the coastal valleys of Ventura county. Heat index values between 105 and 112 degrees were reported.

Excessive Heat in LOS ANGELES COUNTY VALLEYS, CALIFORNIA
From 30-AUG-07 00:00:00 to 31-AUG-07 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The combination of above normal temperatures and relative humidity produced excessive heat across the San Fernando and San Gabriel Valleys with heat index values between 105 and 112 reported.

Excessive Heat in SANTA CLARITA VALLEY, CALIFORNIA
From 30-AUG-07 00:00:00 to 31-AUG-07 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The combination of above normal temperatures and relative humidity produced excessive heat across the Santa Clarita Valley with heat index values between 105 and 112 reported.

Excessive Heat in SANTA MONICA MOUNTAINS RECREATION AREA, CALIFORNIA
From 30-AUG-07 00:00:00 to 31-AUG-07 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The combination of above normal temperatures and relative humidity produced excessive heat across the Santa Monica Mountains with heat index values between 105 and 112 reported.

Excessive Heat in LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE, CALIFORNIA
From 30-AUG-07 00:00:00 to 31-AUG-07 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The combination of above normal temperatures and relative humidity produced excessive heat across the mountains of Los Angeles county with heat index values between 105 and 112 reported.