The upper limit for F5 winds were originally set at 318 mph. This is somewhat of a tricky thing, though, as tornado ratings are based on the severity of the damage, which is used to estimate wind speed. The problem is, damage caused by F5 winds is so complete, it is impossible to determine if winds were faster.
When the Enhanced Fujita scale replaced the Fujita scale in 2007, the new EF5 category had no set upper limit for wind speed.
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The highest wind speed recorded in an F5 tornado is estimated to be around 261-318 mph (420-512 km/h). These tornadoes are extremely rare and destructive, causing catastrophic damage.
As the original Fujita scale estimated, the maximum wind speed for an F5 tornado was 318 mph. However, it would be impossible for a tornado to be rated higher than F5 as actual ratings are based on damage and F5 damage leaves no room of a higher category. On the newer Enhanced Fujita scale the highest category, EF5, has no upper bound for wind speeds.
The Highest wind speed ever recorded in a tornado was 302 mph (some sources say 318 mph) in the F5 tornado that struck Moore and Bridgecreek Oklahoma on May 3, 1999. This tornado is sometimes referred to as the Oklahoma City tornado
The highest tornado category on the Enhanced Fujita Scale is EF5, which indicates tornadoes with estimated wind speeds of over 200 mph and causing extreme damage.
A F5 tornado is the most intense on the Fujita scale, with wind speeds exceeding 200 mph. Very few natural phenomena can rival the speed of an F5 tornado, but some examples include the speed of a jet stream at high altitudes or the velocity of a high-speed bullet.
The highest Fujita rating for a tornado is F5, which represents winds of 261-318 mph (419-512 km/h). F5 tornadoes are considered to be the most powerful and destructive, capable of causing catastrophic damage.