(Lincoln, IL) — Afternoon temperatures will be in the 90s and will combine with dew points in the 70s, resulting in heat indices in the 99-106 range today. Therefore a Heat Advisory remains in effect for the entire area through this afternoon. Storms will then develop west of the area and move into northwest and west central Illinois early this evening. Storms will spread east and southeast during the night and continue into Wednesday. There is a slight risk that some of the storms this evening northwest of the Illinois River could become severe, with large hail and damaging winds possible. A brief tornado touchdown is also possible. Locally heavy rainfall and intense cloud to ground lightning will also occur with these storms. This system will also bring an end to the oppressive heat, as high temperatures top out in the 70s and 80s for the rest of the week.