A heat wave looks to begin Thursday, followed by a worsening of the heat into the weekend. A few random storms will increase during the weekend, followed by more widespread rainfall, then some slight relief from the high humidity & heat.
The NWS released a detailed radar showing what’s expected....
A few spotty showers/thunder showers will continue to be possible into evening, followed by areas of fog developing.
A large complex or two of storms with some severe weather & lots of flash flooding will pass southwest & south of us through Missouri & southern Illinois & Indiana. This will only enhance the oppressive heat ahead as our winds will be blowing off all of that saturated, flooded ground, carrying moisture to evaporate into the heat. Add the rapidly-growing & even tasseling corn & lush vegetation into the mix (from all of the rain) & it all equals very high humidity as heat from the Southwest U.S. & Mexico overspreads our area. Temperatures at 5,000' will climb to near 80, signaling intense heat over the area Saturday-Sunday.
The moisture & lush vegetation will keep it at 90-95, rather than surging to like 95-100.