Tuesday could be summer’s hottest day yet, but thunderstorms possible

Get ready for a steamy, stormy Tuesday. Soaring temperatures could bring us the hottest day yet this year, but strong thunderstorms might hit the Chicago area in the evening.

Highs will be in the lower 90s under a partly cloudy sky, according to the National Weather Service office in Romeoville. However, the heat index — a measure of how hot it feels when humidity is added to the air temperature — could reach 95 or even 100 degrees.

That could make it the hottest day this summer for most of northeastern Illinois and northwest Indiana, the weather service said.

Tuesday evening brings a chance of thunderstorms, and possibly rainfall heavy enough to cause flash flooding, the weather service said. The storms could also bring severe wind gusts or large hail.

Lows will drop to the upper 60s Tuesday night before a high Wednesday in the mid-70s, the weather service said. Another round of thunderstorms are possible again Friday night through Sunday.

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