We are looking at extreme heat and humidity again today. And, also the chance of an isolated severe storm this afternoon and tonight. We have a chance of a shower or thunderstorm today with a high of 93 and a heat index value of 106. An Excessive Heat Warning remains in effect until 7 pm. Tonight we have a chance of showers and storms wtih a low of 73. In their situation report for today, the National Weather Service in St. Louis says isolated severe storms are possible this afternoon and tonight, with damaging winds to 60 miles per hour and large hail the size of quarters being the primary threats from the storms that will develop.