Another inconvenient truth.
Via economist Mark J. Perry:
Chart of the Day I (above) shows the annual number of strong to violent tornadoes (F3+) tornadoes in the US back to 1954. We are way past the main tornado season (March through June) and there have only been 15 F3+ tornadoes this year. With fewer than 12 weeks left in the year, the US is on track to possibly have the fewest annual number of strong/violent tornadoes in 2017 in more than 60 years. In the period above, the year with the fewest number of F3+ tornadoes was 1987, with 17. The trend line in the chart above shows that the frequency of strong/violent tornadoes in the US has been declining over time. For example, the average number of annual F3+ tornadoes in the first half of the sample above was almost 56 compared to an average annual count of 34.5 tornadoes during the second half of the sample.
Q: According to Al Gore, isn’t there supposed to be a connection between global warming and extreme weather? If so, shouldn’t the frequency of F3+ tornadoes be trending up over time, instead of down?