A big blaze produces a lot of hot, rising, pyrocumulonimbus clouds—or “pyroCb”—that in turn produce lightning, that then sparks new wildfires as the clouds move across the landscape. In other words, a wildfire can become a runaway, self-proliferating machine.
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Cloud formed by Canadian wildfire illuminates how nuclear winter works
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Lightning - Wikipedia
Cloud formed by Canadian wildfire illuminates how nuclear winter works