“Extreme fire activity” explained.
A distressing effect of pyrocumulus clouds is “spotting,” Hockenberry said.
Running fires are when fires accelerate at a rate faster that can be controlled. Crown fires take place when fires climb a tree; they usually spread below the tree line before making their way upward, Hockenberry says. All of the air rushing upward has to be replaced at the surface, said Dawn Johnson, a senior meteorologist at NWS Reno to USA TODAY earlier this week. As air comes in it sometimes starts to rotate.
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