This scale contained six categories, where F0 denoted the weakest ... absolute certainty that Twisters’ EF5 tornadoes are stronger than their F5 counterparts. The two scales still have many ...

from F0 or EF0 for the lowest-strength tornado to F5 or EF5, which are considered the strongest. Here’s a look back at some of the most devastating tornadoes by county: The most damaging tornado ...