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It's hard to say. Alabama has had more F5s than any other state. Decatur alone has had three come through over the years. North of Birmingham has had two. If I lived in Northwest Alabama over to Huntsville, I wouldn't own a house without an underground shelter.
Oklahoma averages more a year than Alabama, but once you figure in tornadoes per square mile, they're roughly even. Meanwhile, Kansas has more per square mile than either, but fewer F5s.
So I guess it depends on what your criteria would be.
According to this map, the greater OKC metro has had 3 EF5s, while Birmingham has had 2 and Dallas has had 0. Also, somewhere in the OKC metro gets hit by a tornado about every year I think. I'm not sure how Dallas or Birmingham compare in that respect. But I think there's a good chance OKC could be considered the tornado capital of America (or the world for that matter).
Top 10 counties that have recorded the most tornadoes since 1950:
Weld County Colorado
Harris County Texas
Adams County Colorado
Palm Beach County Florida
Polk County Florida
Caddo County Oklahoma
Hillsborough County Florida
Oklahoma County Oklahoma
Miami-Dade County Florida
Pinellas County Florida
Based on this and conventional knowledge of tornado strength tendencies in different areas, it would seem to be Oklahoma City. (Harris County, TX is located on the coast - nowhere near the Plains.)
It seems like Dallas is just as prone, if not more prone, to tornadoes as OKC. Is this true?
What about Central Alabama's Dixie Alley? Is it as bad as OKC?
I would say that since Dallas is more solidly a Cfa (Humid Subtropical) climate, that Dallas is considerably more prone to both tornadoes and also to the impact of inland moving tropical storms or hurricanes from the gulf coast. I would also tend to agree that central alabama's dixie alley is also quite prone to twisters and inland bound tropical storms or hurricanes. So i would say that in a nutshell it is true about Dallas being just as prone to twisters as OKC.
Birmingham also had a very high end EF-4 on April 27, 2011. This was the same tornado that hit Tuscaloosa and continued into the Birmingham area. There was also an EF-4 tornado in the 1950's. Interestingly, both EF-5 tornadoes and the two EF-4's affected some of the same areas on the west to northwest sides of the metro area. Without looking at a map, all of the EF-5 tornadoes documented in Alabama have been from Birmingham to the north and northwest. One EF-5 on 4/27/11 did hit far northeast Alabama up on Sand Mountain.
We here in East Texas get more tornadoes than Dallas.
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