DOZENS OF HOMES DESTROYED. OUR DANA GRIFFIN IS IN THE FIRE ZONE TONIGHT. >> Reporter: HIGH FIRE DANGER ACROSS THE WEST. >> WE HOPE THE WINDS DON'T SHIFT, AND, YOU KNOW, WE'RE STILL WORRIED. >> Reporter: FIVE MILLION PEOPLE UNDER RED FLAG WARNINGS, AS LOW HUMIDITY AND GUSTY WINDS THREATEN TO SPREAD EXISTING FIRES. >> THERE'S STILL A POTENTIAL FOR MORE PEOPLE TO BE DISRUPTED, AND HEAVEN FORBID, ANYBODY TO BE INJURED OR KILLED. >> Reporter: FIREFIGHTERS PUSHING BACK FLAMES IN FOUR SOUTHERN CALIFORNIA COUNTIES. GOVERNOR GAVIN NEWSOM EXTENDING THE EMERGENCY DECLARATION AFTER TOURING THE FIRE ZONE. AFTER THOSE FIRES EXPLODED OVERNIGHT TUESDAY, HARROWING TALES OF SURVIVOR. AS THE BRIDGE FIRE CHEWED THROUGH CALIFORNIA -- >> THE WHOLE SOUTH SIDE OF MOUNTAIN HIGH WAS FULLY ENGULFED AND HAD TRIED MULTIPLE TIMES TO CALL 911, COULDN'T GET THROUGH TO THEM. >> Reporter: SO, CHRIS DROVE TO THE FIRE DEPARTMENT. >> I SHOWED THEM PICTURES OF WHERE IT WAS AND EVERYTHING. AND THEY IMMEDIATELY SAID, OKAY, WE'RE GOING TO GET RIGHT ON IT. >> Reporter: THE SMOKE LEAVING AIR UNHEALTHY TO BREATHE, A WEEKEND MUSIC FESTIVAL NOW CANCELED. AND TODAY INVESTIGATORS HAD SUSPECTED ARSONIST, JUSTIN -- WITH NINE CHARGES, ACCUSING HIM OF STARTING THE LINE FIRE. >> I CAN ASSURE THE PUBLIC WE'RE GOING TO GO HARD ON THIS CASE. >> Reporter: IF CONVICTED, THE D.A. SAYS HE COULD GO AWAY FOR LIFE. HIS FAMILY DECLINED TO KMEBT. >> DANA JOINS US FROM RIVERSIDE COUNTY WHERE THE AIRPORT FIRE, AS IT'S KNOWN, SPREAD FROM A NEIGHBORING COUNTY. DANA, I UNDERSTAND THIS BLAZE WAS SPARKED BY ACCIDENT. >> Reporter: THAT'S RIGHT, LESTER. YOU CAN SEE DEVASTATION. THESE HOMES CAN GO UP WITHIN MINUTES. IT WAS