In fact, @NWSSPC hadn't previously issued a "moderate" #severe risk in the Upper Midwest in any winter month (Dec, Jan or Feb) since at least 2002.

Destructive winds are primary threat, but a few tornadoes are possible.

Maps: Iowa Environmental Mesonet. pic.twitter.com/w9250zkRkq

— Jonathan Erdman (@wxjerdman) December 15, 2021