Oklahoma Tornado, May 3rd 1999 (formation of the tornado)

44 people died that day, but

Guin, AL `74, Brandenburg, KY `74, Andover, KS `91, Jarrell, TX `97... all those are believed to be members of the "300mph club" meaning they were estimated at 275-300mph...

I think Niles, OH-Wheatland, PA '85 might fall into that as well but I'm not sure.

F6-F12
319 to sonic speed
Inconceivable damage should a tornado with the maximum wind speed in excess of F6 occur, the extent and types of damage may not be conceived.
Circa 1971 This was part of the Fujita Scale Google this and see.
( Fujita Scale Circa 1971 )
Later on this part was removed . Now if you google what I put ( ) around you will see , there was a F6 Catagory at one time, but it was removed Prior to the 1999 outbreak, hence no F6 catagory is correct.
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you don't have to explain this to me, I have a BS in Meteorology ! but you are correct. The scale did go to F-12 (mach-1) but Dr. Fujita explained that if an F6 were to occur, the damage would be indisinguishable from F-5 damage. The scale is of course updated to the Enhanced Fujita scale and it maxes out at EF-5.

we need to stop arguing anyways... we live in the Enhanced Fujiate Scale world now anyways ! and it took a LONG time to put it together. In reality, it is believed that less than 10 observed tornadoes have ever acheived 300mph winds. This was obviously one of them... others that might have hit 300mph are: Andover, KS 1991, Jarrell, TX 1997, Xenia, OH & Guin, AL 1974, Tri-State 1925... incredibly rare.

true enough... and i honestly believe you about those particular tornadoes.They were pretty nasty no doubt.. tri state was extremely bad , killed a lot of people . of course without an idea it was coming , there was no way to prevent the death that storm rained down...WOW , anyways later on ..

here again Igor Google the original concieved fujita scale. Neither one , you nor Chri25 are exactly correct. Number 1 if any weather person said it was an F6 they were full of shit. They however did say it was in Oklahoma . So Chri25 is correct , it was said on air. Now Igor there was an F6 like i explained above , it was taken out of the fujita scale after fujita realized that it was inconcievable to have an F6 because the damage could get no worse in an F6 than an F5.

HEY , before you continue with your tirade, igor there was " on the original F scale " an F6 catagory , as a matter of fact it was up to F12.  After the concieved fujita scale was redone it excluded F6 - F12 because the damage past F5 was " inconcievable" according to Dr Fujita himself. hence the highest rating after the scale was redone was an F5. So technically there was an F6 catagory, but it was removed way before this tornado ever touched the dirt. Google is a wonderful thing..

no carlos , its based on damage , the association with wind speed is not true.
Its a damage related scale. the windspeed is an estimation of the wind speeds it would have to cause the damage, read u p on your F and EF scales , its called google , use it.