ILLINOIS AND INDIANA — Widespread significant severe weather is likely across almost all of Illinois and into northwest Indiana on Monday, April 27, 2026, with the NWS maintaining an Enhanced Risk (Level 3 of 5) for the afternoon into overnight hours. Strong tornadoes, large hail, and damaging wind gusts are all possible across a broad and densely populated corridor.
Precise Timing by Region
Storms will develop and move through in a clearly defined sequence:
Region Storm Timing
Iowa into northwest and western Illinois 2:00 PM to 9:00 PM…