En 2008, on croyait que le réchauffement climatique allait faire augmenter le nombre de tornades aux États-Unis:

Global Warming

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A 2008 report from the U.S. Global Change and Research Program, a federal interagency research program overseen by the White House Office of Science and Technology Policy, found that more greenhouse gases in the atmosphere could lead to an increase in severe storm conditions that make tornadoes possible.

En 2012, on croit maintenant que le réchauffement climatique va faire diminuer le nombre de tornades aux États-Unis:

Preliminary data gathered at the NOAA show that the summer of 2012 may break the record for the fewest tornadoes for any U.S. summer. […] As the summer progressed, the drought just more intense. There was no chance to develop the storm systems that produce any kind of precipitation, let alone tornadoes.

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Global Warming

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