PATCHY DENSE FOG TONIGHT AND WEDNESDAY MORNING... The combination of cooler ground temperatures, recent rainfall and milder air overspreading the surface will lead to patchy dense fog tonight into early Wednesday morning. If you are traveling, allow for extra time, use your low beam headlights and leave plenty of distance ahead of you. The areas of dense fog may expand overnight...a Dense Fog Advisory may be issued if observations and reports indicate greater coverage of areas with low visibility.