(OLNEY/NEWTON) With that slow-moving warm front still heading north across Illinois, those of us on the south side of the frontal boundary will have our heat and humidity levels increase today and stay in place for several more days and nights. While our daily highs will hang around the 90 degree mark, our heat index values will not quite hit 100, but the humidity levels will give us a daily chance of an isolated shower or thunderstorm today and tomorrow, just like we had last night with a few regional storms that gave those spots a few tenths of rain and some lightning and thunder. An upper level ridge will remain firmly entrenched to our southeast, continuing to give us dry and warm conditions through most all of next week. Another frontal boundary will push into our downstate area from the northwest by the end of the week, giving us rain chances Friday into Saturday. But until then, it’s a mostly dry and hot holiday weekend today through Monday, Labor Day. Stay tuned to a NOAA Weather Alert Radio for weather updates and details.