Thunderstorms, heat fuel wildfires burning across West

Two planes and a helicopter work on the fire in Parleys Canyon, Saturday, Aug. 14, 2021, in Utah. (Rick Egan/The Salt Lake Tribune via AP)

QUINCY, Calif. — The danger of new fires erupting across the West because of unstable weather conditions added to the burden already faced by overstretched crews battling blazes across the region.