Every weather pattern goes through regular cycles of roughly 60 years, building up to an extreme maximum and then declining to an extreme minimum. The records only go back through 1953 which means one cycle or less has been observed in detail with weather satellites.
Here's the graph of the number of tornadoes in Colorado vs the number of hurricanes in the US from an earlier post. You can see that the number of tornadoes peaked in the 1990's and is currently declining toward a minimum.
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