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The pros of OKC are that it's much more affordable than Seattle and you'd see plenty of tornadoes. It doesn't compare to Seattle as far as nightlife and generally having things to do go, but there's actually a decent restaurant scene and if you like to get /out/ there are some hidden gems in Oklahoma. Other posters itt are right that it's kind of gross and there's a big homeless population.
If you like tornadoes and generally unpredictable and possibly violent weather, then you'll get plenty in OKC. Spring is tornado season here, but in the past few years we've been seeing more tornadoes in the fall. If you do move here then make sure you learn what to do when a tornado happens, especially if you want to storm chase because you will only have about a 10 minute warning if one is heading towards you. Don't hide under highway overpasses, where the closest tornado shelter is, that kind of thing.