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Flights leaving from O'Hare were delayed by over an hour as of 8 p.m., according to the Federal Aviation Administration. Delays were expected to increase as thunderstorms passed through.
The National Oceanic and Atmospheric Administration predicts a slightly weaker display than on Friday night, with the strongest solar shows likely visible between 7 and 10 p.m. Saturday and 3 a.m. to 6 a.m. Sunday.