National Weather Service officials called an air quality alert in effect until Sunday and said a few thunderstorms are possible Saturday afternoon in portions of north central and northeast Illinois, and northwest Indiana.

       Weather officials cautioned those in sensitive groups with respiratory and pulmonary conditions to limit prolonged activities outdoors.

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       At least one tornado was confirmed by radar indicators Friday evening in suburban Wheaton, officials said.

       Friday’s storms brought damaging wind gusts to portions of northern Illinois overnight. Officials confirm at least one tornado happened near the Warrenville/Wheaton area based on radar and debris, officials said.