What wind speed is F6

So, F6 on the Fujita scale? That's the big one. The one that exists only in theory. Nobody's ever actually seen it. Dr. T. Theodore Fujita cooked up his scale back in 1971, rating twisters by the mess they leave behind. An F6 would be the absolute worst thing imaginable—wind speeds pegged somewhere between 319 and 379 miles per hour (513 to 610 km/h). Here's the kicker though: they scrapped that whole scale in 2007 for the Enhanced Fujita Scale (EF-Scale). And guess what? There's no EF6. The highest you can get now is EF5, which just means winds over 200 mph (322 km/h). The F6 thing? Never actually used. Nobody's ever reliably clocked winds that high in a tornado.

What is the exact wind speed range for an F6 tornado?

The old Fujita scale said an F6 would blow at 319 to 379 mph (513 to 610 km/h). That number came from theoretical guesses about what might happen if a tornado's winds went beyond the F5 ceiling (261-318 mph). But honestly? Modern science thinks that's pretty much impossible. The cap for real-world tornadoes seems to be around 300 mph (483 km/h), which just barely squeaks into the top of F5 territory. Fujita threw in the F6 category for the sake of completeness, really. It was never meant to be something you'd actually use.

Why was the F6 rating removed from modern tornado scales?

When the Enhanced Fujita Scale (EF-Scale) rolled out in the US in 2007, the F6 rating just vanished. The whole point was to fix the problems with the original scale. Like—how do you tell the difference between damage from a 250 mph wind and a 350 mph wind? You can't. The damage is just... gone. The EF-Scale uses 28 different damage indicators (trees, houses, mobile homes, that sort of thing) to make better guesses about wind speeds. Since no tornado has ever produced damage that screams "F6," they just capped it at EF5. That covers anything over 200 mph (322 km/h) with no upper limit. The thinking was: F5 damage is already described as "incredible." An F6 would just be more of the same wreckage, just slightly worse.

Has any tornado ever been rated F6?

Nope. Not a single one. There's been talk about some tornadoes maybe hitting F6 intensity—like the 1999 Bridge Creek-Moore tornado in Oklahoma. Doppler radar clocked winds at 301 mph (484 km/h) in that one. But those measurements aren't the final word for rating purposes. The National Weather Service never gave it an F6. In fact, they never gave it to any tornado. The F6 category just sat there, unused. The 1999 tornado got an F5 rating, radar readings be damned. So F6 remains a topic for meteorologists to argue about over coffee—not something you'll ever see on a real report.

What would an F6 tornado look like?

Honestly? Unimaginable. Based on the theory, you're looking at a massive, multi-vortex beast with a damage path maybe a mile wide or more. The winds would be so intense that buildings wouldn't just be destroyed—they'd be pulverized. Cars thrown for miles. The ground itself scoured clean. The sound? A continuous roar that'd drown out everything else. Visually, it'd probably be a dark, churning wall of debris with a condensation funnel so wide you wouldn't believe it. But again—nobody's ever seen one. These are just guesses. The winds would be so extreme you probably couldn't even get close enough to look at it safely.

What is the difference between F5 and F6 tornadoes?

It's all about the wind range. F5 is 261 to 318 mph (420 to 512 km/h). F6 would be 319 to 379 mph (513 to 610 km/h). Damage-wise? Both would absolutely annihilate anything in their path. F5 damage is already called "incredible"—houses swept away, cars tossed around like toys, trees stripped bare. An F6 would supposedly be even worse. Think buildings completely ground into dust, asphalt ripped off roads. But the thing is—when everything is already destroyed, how do you tell the difference? You can't. That's exactly why the F6 category was never used and eventually dropped from the scale.

Frequently Asked Questions about F6 Tornadoes