Overview

• The first wave of showers and thunderstorms moved through overnight into Sunday, with activity easing by midday in parts of the Midwest, Great Lakes and Ohio Valley as winds gust 30–50 mph and briefly higher in spots.
• Forecast guidance points to renewed impacts late Sunday night into Monday morning, including heavy rain bands, embedded thunder and a low severe risk focused on damaging straight-line winds.
• Rainfall will vary widely, with many areas near 0.5–1.5 inches and locally higher totals northwest of some metros like Detroit, while other zones see only a few tenths; isolated urban and poor‑drainage flooding is possible.
• Temperatures fall sharply behind the front, dropping from unseasonably warm levels into the 50s Sunday afternoon and into the 40s by early Monday in several regions.
• Marine and lake headlines are in effect in spots, including a Lake Wind Advisory in the CSRA and Small Craft Advisory/Gale Warning on Lake Michigan, as rough waters accompany the strongest gusts.