Easing winds delivered a brief but much-needed reprieve to firefighters Tuesday as they battled two massive blazes burning in the Los Angeles area, and the National Weather Service pushed back its unusually dire warning of critical fire weather until early the following day.

Containing wildfires—never mind extinguishing them—in parched and windy conditions can be monstrously difficult. Dry vegetation is rocket fuel for blazes and wind both feeds the flames and spreads the embers. “The winds are like pointing an air blower at a fireplace,” says Gershunov, “except it’s not contained and it’s on a much larger scale.”