Why are they so difficult to put out? Extreme fires are not simply a line of fire (as low intensity fires often are). The rising hot air carries burning material up and “forward”, and dry/hot conditions allow those embers to ignite where they land. This means to stop it, you need to stop the constant ignition that may be occurring a mile (or more ahead of it). Extinguishing every flame, dozens of miles wide, a mile deep, moving a few miles an hour over inaccessible terrain? Almost impossible. The only way is to try and pre-burn an area in front of it – if weather/fuel/topological conditions allow and hope it won’t result in another uncontrollable fire.
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