Tornadoes are releasing 5.5% more power per year.
These twisters are also staying on the ground, on average, for more time than they did just a few decades ago. That gives tornadoes more time to do damage,…
… the overall power in gigawatts released by tornadoes in the United States has increased, at a rate of about 5.5 percent per year. … although the overall number of tornadoes hasn’t increased, the twisters are forming in bigger bunches. In these clusters, there is a higher proportion of tornadoes rated at the highest intensities, such as EF4 or EF5 tornadoes.
That shift …is linked to rising ocean temperatures in the Gulf of Mexico and the western Caribbean Sea. [emphasis mine]