How strong is a tornado in tornado alley?

Answer 1

The strongest winds ever recorded in a tornado (302 mph +/- 20) occurred in the Moore, Oklahoma F5 tornado of May 3, 1999.
However, actual wind measurements from tornadoes are rare, so other tornadoes may have been stronger, but never had their winds measured.
Another good candidate for the strongest tornado in Tornado Alley is the Jarrell, Texas tornado of May 27, 1997, which produced the most extreme tornado damage ever documented.

Answer 2

That is difficult to say. The highest wind speed recorded in a tornado (302 mph+/- 20) was in the Oklahoma City F5 tornado of May 3, 1999. However, actual wind measurements of tornadic winds are rare so it is quite possible that other tornadoes may have been stronger. Two possible candidates for this are the Jarrell, Texas tornado of May 27, 1997 and the Xenia, Ohio tornado of April 3, 1974. Both were also rated F5.

Answer 3

A tornado in Tornado Alley can be any strength. As with everywhere else the majority of tornadoes there are of EF0 or EF1 strength. However, Tornado Alley also has more tornadoes of EF4 and EF5 strength than anywhere else in the world.