This image provides you with an interesting graphical view of tornado tracks across the United States for the last 61 years. The image was created by IDVsolutions. The tracks are shown by the F-scale, meaning the more severe storms are represented by the brighter lines.
For even more information on same topic, go to John Nelson’s blog.
His blog is at the following link:
At this blog site you can check out tornado tracks broken out by F-scale. There you will learn that, relatively speaking, there are not lots and lots of F-4 and F-5 tornadoes. You will also be able to breakdown the tracks by seasonality. And, you will also be able to view the tornado tracks animated by month or by year.