Weekend thunderstorms wreaked havoc Sunday across Chicago, resulting in flooding the National Weather Service described as “potentially life-threatening,” swamping highways, halting some Chicago Transit Authority services and damaging dozens of homes.

       Flash flood warnings were in effect throughout the day Sunday and a flood warning remained in effect until 1 a.m. Monday, the weather service said. High water was expected to recede slowly.

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       More than 250 residents had submitted basement flooding complaints to 311 since Saturday afternoon when the weather service began issuing storm warnings. The vast majority stemmed from Austin.