A tornado's rating is an assessment of its intensity on the Enhanced Fujita scale. Damage is analyzed to give an estimate of the tornado's peak wind speed, which is then used to assign it a rating ranging from EF0 for the weakest tornadoes to EF5 for the strongest tornadoes
A tornado anywhere is a violent event. If you mean by the technical definition of a violent tornado, one rated EF4 or EF5, such tornadoes do occur fairly regularly in Tornado Alley, but make up a very small minority of the tornadoes that occur there. As with most places, most of the tornadoes in Tornado Alley are rated EF0 or EF1.
If you mean a rating on the Fujita scale, yes. While the scale did not exist in 1925 when the tornado occurred, it was retrospectively rated F5.
A tornado with estimated winds of 100 mph would be rated EF1.
The Hallam, Nebraska tornado was rated F4
The Topeka, Kansas tornado 1966 was an F5.
The Waco, Texas tornado of May 11, 1953 was rated F5.
The intensity of a tornado is rated based on damage done on the ground.
When a storm spawns a tornado it produce a tornado.
The last confirmed tornado was in Texas on September 17, 2011. It was rated EF0
The Tuscaloosa, Alabama tornado of April 27, 2011 was rated EF4.
A tornado that stays in a field would be rated EF0 as currently there is no Standford for rating tornado damage to crops.
A tornado with estimated winds of 120 mph would be rated EF2.