Two rounds of strong thunderstorms are expected in Illinois on Saturday and Sunday, forecasters said. | Graphic: NWS Chicago

Following record-breaking warmth earlier this week, forecasters say thunderstorms are expected Saturday and snow is possible on Monday in the northern Illinois area.

The National Weather Service (NWS) said that the summer-like warmth on Thursday in the Chicagoland area broke records.

The highest recorded temperature was in Wheeling at 85 degrees.

At O’Hare Airport, the weather service recorded 83 degrees, which was a record high for April 13 in Chicago.

The old record was 82 degrees on that same date in 1887 and 1941.

The NWS said thunderstorms are expected to lift into the area Saturday evening.

Some of the storms could be strong to severe, especially west and southwest of the Chicago metro.

Damaging winds, damaging hail and frequent lightning are the main threats. Timing is expected between 7 p.m. Saturday and 12 a.m. Sunday.

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Another round of strong storms is possible Sunday morning.

The NWS said temperatures will quickly drop during the day on Sunday behind a cold front.

Blustery conditions are expected with possibly some snow mixing in at times Sunday evening into Monday morning, the NWS said.