SOUTH LAKE TAHOE, Calif. — A weather system affecting northwest California was expected to bring dry lightning and blustery winds through early Friday, unleashing a risk of new wildfires as thousands of firefighters have been making headway against existing blazes.
A warning for dangerous fire weather took effect in much of fire-scarred Northern California Thursday afternoon and was expected to last through at least 11 a.m. Friday.
“The combination of isolated dry lightning and gusty winds with the dry fuels will bring the potential for critical fire weather conditions,” the National Weather Service said.
Historic drought and recent heatwaves tied to climate change have made wildfires harder to fight in the American West. Scientists say climate change has made the region much warmer and drier in the past 30 years and will continue to make weather more extreme and wildfires more frequent and destructive.
The California Department of Forestry and Fire Protection said Wednesday that firefighters were making significant progress against the flames in part because the weather had improved.
More than 14,600 firefighters were on the lines of 13 active, large wildfires in California on Thursday.
The Dixie Fire in the northern Sierra Nevada and southern Cascade Range grew to about 1,451 square miles (3,758 square kilometers) but was 59% contained. It is the second-largest California fire on record. Last year’s August Complex was more extensive, at over 1,613 square miles (4,177 square kilometers).
Near Lake Tahoe, the Caldor Fire grew only slightly, to just over 341 square miles (884 square kilometers), and was 53% contained. Nationally, some 22,000 firefighters were working on 79 active, large wildfires in nine states in the West as well as Minnesota, according to the National Interagency Fire Center in Boise, Idaho.