Is it a basement or a storm cellar ... EF No rating F6-F12 (319 mph to speed of sound) Inconceivable damage. Should a tornado with the maximum wind speed in excess of EF-5 occur, the extent ...

This scale contained six categories, where F0 denoted the weakest, while F6 was used to label ... approach while determining tornado intensities, as per Survive-A-Storm. However, the Enhanced ...

Dr. Ted Fujita, the father of how we rate tornadoes, initially rated the storm an F6 before it was reclassified as an F5. That scale would later become adopted nationwide as the benchmark for ...