The advisory is in effect until 10 a.m. A dense fog advisory is issued by your local National Weather Service office when widespread dense fog develops. When this happens, visibilities frequently drop to one-quarter of a mile or less. These conditions make travel difficult. Take extra caution when on the road or avoid driving if possible.

On Wednesday at 2:28 a.m. the National Weather Service issued a dense fog advisory in effect until 7 a.m. for Salem, Gloucester, Camden and Burlington counties.

On Wednesday at 2:28 a.m. a dense fog advisory was issued by the National Weather Service in effect until 7 a.m. for Western Chester, Eastern Chester, Western Montgomery, Eastern Montgomery, Upper Bucks and Lower Bucks as well as Delaware and Philadelphia counties.