Patchy Dense Fog Continues Into The Early Overnight Hours... Patchy dense fog continues to linger across the region into the beginning of the overnight hours. There has been improvement in overall visibilities, especially with the rainfall, but patchy dense fog may still cause travel hazards for some locations. Visibility conditions expected to improve late tonight. If you are driving and encounter fog, slow down, use your low beam headlights, and leave plenty of distance ahead of you.