"To my knowledge, not a single scientist at the Hurricane Research Division, the National Hurricane Center, or the Joint Typhoon Warning Center believes...that there is any measurable impact on hurricane numbers or activity from global warming."

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It is well known that strong to violent tornado activity in the US has decreased markedly since statistics began in the 1950s, which has also been a period of average warming. So, if anything, global warming causes FEWER tornado outbreaks...not more. In other words, more violent tornados would, if anything, be a sign of 'global cooling,' not 'global warming.'

— Roy Spencer