That chart shows dewpoint temps at Noon, and they’ve fallen in the last hour around Lafayette and Muncie. They’d already plunged in Fort Wayne and South Bend. When the DP temp is under 60 most people don’t notice that it’s humid. When it’s 70 or above: you’re talking tropical. The Indy DP has been running right around 70 late Sunday morning.
That drier air will continue creeping southward. You should start noticing the difference in Marion County after 3pm. Not ’til this evening around Bloomington. Once the drier air is in place, it stays through the day tomorrow, increasing again Monday evening.
As expected, a range of temps at Noon. If the forecast holds, it won’t get much warmer from Indy northward.
88 Indy and the Haute