Parts of Chicago were under a severe thunderstorm warning Wednesday morning as a storm system moved east through northern Illinois, according to weather officials.

       Northwestern Cook County was issued a severe thunderstorm warning until 9:45 a.m.

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       The National Weather Service said that the line of thunderstorms could produce heavy local rainfall, frequent lightning and some strong wind gusts up to 70 miles per hour.

       Scott Baker, meteorologist with the National Weather Service, said they’re seeing a weakening trend with the system as it moves toward the Chicago metro area but can’t completely rule out the potential for strong winds.