Storm perimeter expands: weekend to midweek severe weather threat for the Chicago region

The National Weather Service warns of periodic thunderstorms, some potentially severe, from Sunday through Wednesday across Lake and McHenry counties and the Chicago area. The first round is expected Sunday morning into early afternoon, with a risk of damaging winds and hail up to a quarter-size, plus a localized flash-flood threat as storms train. Additional rounds are anticipated Sunday evening into Monday, with the forecast remaining unsettled through Wednesday. Stay tuned to warnings and take precautions when heavy rain or thunder occurs.