It was a hot one today, in fact our hottest of the year thus far - today's high temperature of 89° was the highest recorded in the River City since the last time we saw 90° (that was on September 10th of last year). As a result, the evening ahead will be a mild one; temperatures will only fall as low as 77° or so by 10PM. Overnight low temperatures near the mid 60s (66° in Evansville) will again give the mercury a running head start Tuesday, allowing afternoon highs to surge back into the upper 80s and low 90s tomorrow afternoon! Current model data suggests that we'll eclipse today's high of 89° and head straight to 90° Tuesday. If that forecast holds, not only will it mark our hottest day of 2021, but also our hottest day in eight and a half months!
The added warmth will be accompanied by some more moisture as well. The combination of heat and humidity tomorrow afternoon could produce a few sporadic and short-lived showers - I'm not expecting these rain chances to be all that widespread nor impact the Tri-State in any significant way. The best chance for pop-up showers tomorrow will occur between the hours of 2PM and 6PM Tuesday. Fortunately, the evening should be a primarily dry one, so as long as you don't mind spending some time in temperatures ranging between 85° and 88°, you may want to fire up the grill Tuesday evening.
Wednesday looks as though it'll be slightly cooler - afternoon highs near 86° however are still expected to be warm enough to fuel shower and thunderstorm development. The latest projections indicate that a cluster of shower and thunderstorm activity will fire up along the I-70 that afternoon and race southeastward into the Tri-State. Not all model data is in agreement however, so we're going to keep a close eye on Wednesday for the potential for strong the even Severe thunderstorms that afternoon and early evening; the more model runs we see in the coming hours will give us a much better idea of what we're looking at. Regardless of the outcome, due to the added heat and humidity Wednesday, we should prepare for scattered showers and storms that afternoon.