Tornadoes

How many F5 tornadoes have occurred in Oklahoma?

According to Significant Tornadoes 1680-1991, by Thomas P. Grazulis, 1993, Environmental Films, St. Johnsbury VT, pp. 462-476, there have been eight F5 tornadoes in Oklahoma between 1880 and 1991. A ninth F5 occurred on May 3, 1999, in the communities of Bridge Creek and Moore. The deadliest Oklahoma tornado, the one that struck Woodward on April 9, 1947, was also an F5. It is important to remember that the F-scale is somewhat subjective, which can lead to some disagreement between experts as to the true rating of a given storm. Also, most of these tornadoes were given ratings long after they occurred, based on surviving reports of the storm-related damage.