Patchy Dense Fog Early This Morning... Patchy dense fog will persist through the overnight hours. The lowest visibilities are expected near the Michigan border in Lucas County and along the lakeshore, where visibility may drop to a half mile or less at times. Motorists may encounter fluctuating visibilities ranging from good to poor in short distances. Conditions will begin to improve by mid-morning. If driving, slow down, use your low beam headlights, and leave plenty of distance ahead of you.