A cold front is sagging southeast through Missouri and Illinois this afternoon. Ahead of the front, it is warm and humid. Temperatures at noon range in the upper 80's to 90° across southeast Missouri, southern Illinois, and western Kentucky. Dew points range in the lower to middle 70's. (Cape Girardeau Airport reported a dew point of 77°.)
As the front gets closer, temperatures continue to climb, and humidity is in place, we could see a few strong thunderstorms develop. In fact, the Storm Prediction Center has parts of southeast Missouri and southern Illinois in a "Slight Risk" for severe thunderstorms. The main threat should be damaging wind and large hail.
Here is the Day 1 Outlook from the Storm Prediction Center. This outlook covers through 7am Tuesday.
Below is the Day 2 Outlook from the Storm Prediction Center. This covers the time period from 7am Tuesday through 7am Wednesday.
The main threat Tuesday afternoon will be large hail and damaging wind.