Due to the La Nina in place since the Fall, it means the jet stream is pushed farther north for the eastern half of the US, which means unusually warm air masses have been in place. In areas right along the boundary of this, like MN, it's basically spring-like conditions occurring earlier than normal. And aren't tornados mostly a Spring thing? So I'd say this is to be expected.
What are the defining characteristics of Spring in Tornado Alley? Warm, humid air from the Gulf of Mexico colliding with the cold, dry arctic air in place over the Winter. That's exactly what is happening now, just earlier than usual.
They're talking about snow for us this weekend, and yet it's like 75 degrees today. Weird weather, but hardly unprecedented.