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The “F” scale actually goes up to F12… F6 or greater was never expected to be reached, so it isn’t commonly shown on most scales. Since the “F” scale is purely a damage scale, and F5 is the worst damage you can have (everything swept away), it would be near impossible to reach F6 damage…
Since the Fujita scale is based on the severity of damage resulting from high winds, an F6 or an F7 tornado is a theoretical construct. A tornado with wind speeds greater than 319 miles per hour (513 km/h) is theoretically possible, and the 1999 Bridge Creek-Moore Tornado may have been such an event.
As the max “F5” is 318 mph, the upper wind-speed range for this tornado is actually slightly beyond an F5, although it is officially listed as an F5. If you extended the “F-scale” based on winds, an F7 would be something like 380 to 450 mph, and would be several miles across.
As a factual statement, claiming that EF5 tornadoes can’t be survived above ground is wrong. After the 3 May 1999 tornado that hit Moore, Oklahoma, survey work indicated that 1% of people who were in houses that were rated F4 or F5 were killed, as reported by Hammer and Schmidlin.
Officially rated EF5 event. Many homes were swept from their foundations in West Erie, some houses only had bare slab remaining, a heavy sign that EF6 winds could have occurred, the tornado was listed as a EF6 in the 2030 NWS SPC list of EF6 tornadoes in the US. Mobile, Alabama. May 14, 2030.
F6 tornadoes had a wind speed of 300+ mph. EF6 tornadoes have a wind speed of 319 mph or more. (This is just an article that I made for fun.) A tornado tore through Flint, leaving only bare slabs of homes; rated low-end F6.
Are EF6 Tornadoes officially recognized on the fujita scale or not, I have been quite confused on this and I have been very curious about it. Basically the de facto best operational source would probably be the Storm Prediction Center website. They provide this table: It caps out at EF5.
An F6 Tornado (EF6) is Becoming More and More Likely To Be Confirmed .. In addition to this, an F6 Tornado by Tetsuya Fujita’s defenition, not only required the wind speed to confirm such a storm, but as well confirmation of this speed via damage on the ground (as both the enhanced scale, and original scale adhere).