tl;dr: French firefighters are battling a pyrocumulonimbus ("fire cloud") for the first time in France—a phenomenon previously confined to Australia and North America, where extreme ground heat drives a convective column that generates its own winds, lightning, and unpredictable multi-directional fire fronts. Officials say the blaze cannot be fought directly and have declared "operational impossibility," resorting to defensive tactics and hoping either for prolonged heavy rain or to steer the fire toward the sea.