Locally dense fog continues into this evening... As of 330 PM, visibility across portions of southeast Pennsylvania is less than a half mile, and even locally down to a quarter mile. from portions of Bucks County across the Delaware River into northern New Jersey, the fog is more dense, where a Dense Fog Advisory remains until 6 PM. Visibility across the region may continue to vary overnight, with periods of fog, but light rain moving in later tonight into Thursday may help improve visibility at least above 1 mile in most locations. When traveling in and around dense fog, use caution driving, take it slow, and give extra distance to the vehicle ahead of you. Use extra caution in areas where pedestrians are near roadways.