A slope top shelter can offer you necessary protection during tornado season, including during winter.
Oklahoma Storm Shelters

3 Things Norman and OKC Locals Need to Know About Winter Tornadoes

For residents of OKC and Norman, tornado season isn’t a surprise; mostly safe to expect, you can see tornadoes anywhere from March through August, sometimes later too. But these weather events are incredibly unpredictable and can often come as a second wave during the winter months as well.