If clouds aren't too thick, heat indices could climb to about 105. Second, severe thunderstorm potential. This looks most likely during the afternoon and evening hours. Damaging winds and frequent lightning are possible with the storms.
Third, the storms should evolve into a big cluster of storms over northern Missouri. Extremely heavy rain rates of 3"/hr are possible. Widespread rain totals of 1-3" with pockets of higher amounts likely. Stay weather aware today/tonight.