With flames advancing toward the signature grove of ancient massive trees in Sequoia National Park, firefighters on Thursday fought fire with fire.
Fire-resistant wrap covers a historic welcome sign as the KNP Complex Fire burns in Sequoia National Park, Calif., on Wednesday, Sept. 15, 2021. The blaze is burning near the Giant Forest, home to more than 2,000 giant sequoias. LOS ANGELES —
, including the grove of about 2,000 massive sequoias, including the General Sherman Tree, the world's largest by volume.Three things influence how hot and fast a fire burns: the landscape, with fire burning faster up steep slopes; weather, with winds and dry conditions fanning flames; and fuel, the amount of material that can burn.
Historically, low- to moderate-severity fires every five to 30 years burned out excess brush and timber before deadly fires in the early 20th century led to aggressive firefighting and a U.S. Forest Service policy to suppress all fires by 10 a.m. the day after they were reported. “You need to know how to fight fire before you light fire,” said Paul Broyles, a former chief of fire operations for the National Park Service.
The convection of a fire pulls in winds from all direction, which can help. As fires climb steep terrain, burnouts are sometimes set on the other side of a ridge so any embers will land in an area where dry grasses and brush have already burned.
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