Scariest video ive ever watched. The wind screaming is haunting.F5s were thought to have wind speeds of up to 300mph winds. Two have had that happen. The 1999 Moore Oklahoma tornado in which a dopler radar on wheels measured over 300 mph winds. The other was El Reno. It was dropping 318 mph vortices but was still only gave an EF3 cause the EF scale is based on only damage. That's why I'm saying that Mayfield tornado was an EF5 as it swept houses away leaving nothing but a slab of concrete. I've also read these ratings are very political.