What you need to know: There have been a few studies done about the changing frequency of tornadoes and tornado-favorable environments in the country, showing a notable shift to the east for the most active regions. A big reason why tornado environments seem to be less common on the Plains, aka traditional Tornado Alley, could be because June has seen tornado activity plummet.
A more inconsistent season: Overall, activity on the Plains (classified as OK/TX/KS/CO/NE for this video) seems to have plummeted for June over the last decade. Typically this has been because a ridge of high pressure sets in very quickly over the middle of the country by the end of May. Historically, June has been a month that is on-par if not more active than April, so taking a month away from the peak of tornado season can mean seasons are more inconsistent and quieter overall.
Will it last? This could be a temporary blip in the arc of history of tornado counts. There is still a lot we do not know about long-term trends for tornadoes -- though some of the shifts we are seeing do fit within models of what a warmer planet might look like. While fewer tornadoes for anywhere is good news typically, in an area that experiences much of its rain during storm season -- quiet storm seasons can lead to major droughts over the Plains. It seems to be two-sides of the same coin.
Further Reading: Check out this paper by Vittorio A. Gensini & Harold E. Brooks entitled "Spatial trends in United States tornado frequency".
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