I've been in a tornado warning probably 30 times in my life, and never once would anything bad have happened to me if I hadn't taken cover.
https://www.google.com/maps/place/Oklahoma/@35.856529,-97.81... randomly grabbed from outside of Oklahoma City. Looks mind-numbingly boring.
Ft Collins in Colorado looks like a calmer, more affordable place than Boulder.
West/N.West of OKC is very flat. The further you move east the more terrain you have including the Ouchita Mts (http://en.wikipedia.org/wiki/Geography_of_Oklahoma#mediaview...), the Arbuckle Mts (http://en.wikipedia.org/wiki/Arbuckle_Mountains#mediaviewer/...), and the Wichita Mountains (http://en.wikipedia.org/wiki/Wichita_Mountains#mediaviewer/F...).
Now none of these hold a candle to the spectacular geography of Western Colorado, but they offer nice reprieve from the office for nature lovers. And plenty of lakes for those that prefer swimming, sailing, etc.
https://www.google.com/maps/@46.2468,-114.177067,3a,75y,254....
The view of the thousand foot granite cliffs a few miles up in the mountains is blocked by the trees growing along the blue ribbon trout stream.
I moved to the Missoula area from Seattle. Summer is hotter but drier, winter is colder but drier and sunnier and I can ski powder most weekends.
I've come to enjoy a 20 degree dry day more then a 40 degree and drizzling day like we would get lots of in Seattle.