Too much heat in the atmosphere is forced down where is causes too much rising air which is spun by the natural Coriolis effect which becomes a tornado as trapped cold air is pushed down. If intense enough a tornado is formed. Particulates in the atmosphere mitigate the excessive heat but when air is scrubbed of it’s natural particulates it cannot moderate the heat from the sun. 

Scientists have long known that particles serve to block incoming solar radiation and temporarily cool the planet, and an international team of scientists has quantified that cooling effect, saying the earth would be 0.5 to 1.1 degree C (0.9 to 2 degrees F) warmer if those particles were to disappear.

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