Monday's afternoon high of 89° marked our hottest in the River City in just over two weeks - the last time we dealt with a temperature this warm was on the afternoon of August 29th when we hit 91°. Despite the warmer day, our evening ahead looks as though it will remain quite pleasant; after seeing temperatures dip toward the low 80s by dinnertime, we'll see the mercury fall to 75° around 10PM. Our southerly wind flow however, is expected to keep temperatures fairly mild overnight and early Tuesday morning; many of us will wake up to morning lows in the upper 60s - we'll only fall as low as 69° in Evansville early tomorrow. The combination of more sunshine and southerly winds tomorrow morning and afternoon will drive temperatures even higher for our Tuesday.
Tuesday's anticipated high of 90° could feel more like 93° or 94° in spots as those aforementioned southerly winds drive not only more heat northward into the Ohio Valley, but more of that gulf humidity as well. An advancing cold front is expected to interact with that heat and humidity combo Tuesday and produce potentially Severe storms across Central Illinois and Indiana. That cold front will continue to inch closer to the Tri-State throughout the day, eventually supplying portions of our region with scattered showers and storms after midnight Wednesday. While a few of those storms could be strong during the predawn hours Wednesday, our greatest chance for strong or Severe storms won't arrive util late Wednesday morning. Current model data suggests that a broken line of storms may roll through the Tri-State between the hours of 6AM and 2 PM that day. Some of the storms embedded within that line may generate wind gusts in excess of 50 mph and small hail; as a result, the Storm Prediction Center has placed portions of the Tri-State under a "1" on the Threat Index For late Wednesday morning and early that afternoon.