California Governor Gavin Newsom has deployed fire engines, water-dropping aircraft and hand crews across the region—to enable a rapid response if a new fire does break out, according to The Associated Press.

Santa Anas are the desiccating winds that are common in winter, blowing out of Nevada and Utah and into southwestern California. Carrying dry desert air, they push over the mountains in the Transverse Ranges and accelerate as they move downslope, howling into the canyons and valleys.