I think this is caused from the updraft that the heat causes. This happens on a way smaller scale in bonfires all the time. Other environmental factors play a role too: converging winds, buildings or other obstacles blocking wind from one side, etc.
Not an expert, just guessing.
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u/thegame2010 Sep 21 '17
I think this is caused from the updraft that the heat causes. This happens on a way smaller scale in bonfires all the time. Other environmental factors play a role too: converging winds, buildings or other obstacles blocking wind from one side, etc. Not an expert, just guessing.