Most areas have remained fairly dry since late last night, except for the far southeastern sections of the Tri-States, as the disturbance that models were showing bring a greater threat of precipitation last night into this morning ended up displaced into central and southwestern Illinois.
Yet another disturbance (these are common this time of summer) that has gyrated east-southeast out of Iowa and Nebraska towards the Tri-States has brought in just enough mid to high-level clouds to mollify surface air temperatures to several degrees below those which were originally forecast. Most locations have hit the mid to upper 80s, but most areas may struggle to reach the 90 degree mark today (though it's not entirely out of the question yet). Heat indices are nonetheless running in the middle to upper 90s due to ambient moisture return into the region, and as of early this afternoon some parts of the southern and western sections are already seeing heat indices in the low 100s! How high these get this afternoon will depend on how much more cloud cover lingers in your area.
The presence of this disturbance, a weak surface wave and the approach of a warm front will continue to bring a threat of precipitation tonight and especially Monday. Some of you in the central and southern sections will see light showers with this wave moving through on radar, although it has decayed considerably since early this morning. This will be another system where some areas may seen several tenths of an inch of rain from thundershowers whereas others stay mostly dry.