Intense fires can heat up the atmosphere so much that the smoke plume rises and creates a pyrocumulus cloud, said Brian Nieuwenhuis, meteorologist with the National Weather Service in Medford, Ore.
“If you can get the right atmospheric conditions at the same time, it basically creates its own sort of circulation,” he said. “I’ve heard people refer to it as a large heat pump before because it's taking all the heat and shooting it up into the atmosphere.”
At one point Tuesday, the pyrocumulus cloud generated by the Lava fire grew to 38,000 feet — more than twice as tall as Mt. Shasta itself, according to the weather service.
end partial quote from:
https://news.yahoo.com/crews-tried-couldnt-stop-lava-180049877.html
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