The San Diego area is the newest front in California's statewide battle against raging wildfires after a new blaze erupted there late Thursday.
The inferno extended six square miles in a matter of hours, burning dozens of houses as it ripped through the small city of Fallbrook and its tightly packed Rancho Monserate Country Club community.
Firefighters in Ventura, California 130 miles north were also scrambling Friday to contain largest and most devastating wildfire in the state, which has obliterated 430 buildings.
The so-called Thomas Fire has expanded to 180 square miles since starting Monday, while other fire crews had curbed enough of a conflagration near Los Angeles to lift most evacuation orders there.
Dry, hot, windy conditions across California this week have produced a number of fire this week, and conditions there are extreme for any season, especially so near to winter.
The Associated Press contributed to this report.