A Severe Thunderstorm Watch has been issued for Boone, Cook, DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall, LaSalle, Lake, McHenry and Will counties in Illinois and Lake and Porter counties in Indiana until 8 p.m. Wednesday will be very hot and humid, with highs in the low 90s.

An air quality alert in the Chicago area will stretch into a third day as pollutants continue to linger in the air at high levels.