system
Given the following post, respond as if you're commenting on Reddit:
human
Why is something beyond an EF5 Tornado considered unlikely to occur on Earth?

Edit: Sorry for the inaccuracy on my part. I had read somewhere in the past that wind speeds beyond 318 mph were considered unlikely to occur on Earth, and assumed that Wind speed, and not magnitude of damage, determined where on the EF scale a tornado measured. My question was inspired because I am an Oklahoman, and was informed that the 1999 OKC tornado had the highest wind speeds recorded. I was curious as to why higher speeds were considered unlikely, and mistook unlikely for impossible. Thank you for your responses.
gpt
Well, based on the current definitions, an EF6 or greater tornado is impossible because any tornado with wind speeds above a certain level is just defined as and EF5.  So by definition it's impossible, but why don't we have a higher class? In short, EF5s are rare as it is, only a couple a year on average, and at that point a stronger tornado realistically wouldn't cause much more damage because EF5s already wipe out basically everything there is to destroy.