National Weather Service United States Department of Commerce

Don't burn on Monday, especially if you live in central, northeastern MO and west-central IL where there is a critical fire danger for uncontrollable fire behavior.
A strong cold front moves through the region Tuesday night, bringing the unseasonably warm weather to an abrupt end. Thunderstorms are expected to form in the vicinity of the front, some of which could be strong to severe. There is still considerable uncertainty on the timing of the front which affects the location of where the storms will form. Latest forecasts bring the front through quicker with the better chance for thunderstorms in southeast MO and southern IL.
While we see quite a dramatic warm up in temperatures early this week, that will just make the shift back to colder weather behind Tuesday night's cold front feel that much more brutal. We warm to near 80 on Tuesday, but we drop back into the the 30s on Wednesday. Thunderstorms are possible as the cold front moves through Tuesday night. Cool weather doesn't last very long, though, as we start to rebound back above normal by Friday.