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Areas of dense freezing fog will persist over portions of northern and central Illinois through mid to late this morning before likely dissipating. Be alert for rapidly changing visibility and possible slick/icy conditions on some roadways. Reduce speed, increase following distance, and use low beams when driving in dense fog. Check road conditions and allow extra travel time for your commute.
Areas of dense freezing fog have formed between Chicago and Rockford. This area of dense freezing fog is forecast to expand in coverage over the next several hours.
Those traveling tonight, should be prepared to encounter drastically reduced visibilities. In addition, temperatures are well below freezing, which will result in patchy icy spots forming, mainly on bridges and overpasses.