The "Santa Ana Wildfire Threat Index" categorizes fire risk.
Numerous horses died or were injured Thursday when flames from the wind-driven Lilac Fire swept through the San Luis Rey Training Center in Bonsall, according to a trainer at the facility in northern San Diego County.
Firefighters battled other vast fires in the state as well.
Officials warned the worst is yet to come, as 30 miles per hour to 50 miles per hour winds are expected to fan the flames.
Ken Pimlott, director of the California Department of Forestry and Fire Protection, had said Wednesday that a color-coded danger scale had reached purple, which was never used previously.
"Emergency evacuation happened nearly immediately and at this time, we are doing all we can but it's extremely hard", the post stated.
State officials said the military was assisting with helicopters. "But they are also days that show the resilience of our city". The blaze appears to be moving and growing extremely rapidly.
Cal Fire has issued mandatory evacuations in the area of W. Lilac Rd.
The Liberty Fire was one of six affecting the region and prompting at least 160,000 people to flee their homes.
A climate expert at UC San Diego says Santa Ana winds typically peak during the coldest months of the year, adding to the concern of fire danger extending late into the year. The blaze was 5 percent contained.
Various reports indicated that the fire crossed some of the main roads around the training center.
Los Angeles Fire Capt. Branden Silverman told the Los Angeles Times 110,000 were evacuated in the path of the fire.
Two residents were taken to a hospital for treatment of trauma suffered during the blaze.
"Some of the lower barns-portable barns-caught on fire", Machowsky said, relaying a phone conversation he had with trainer Michele Dollase a half-hour earlier. The blaze in Bel-Air destroyed four homes and damaged 11 others.