Showers with areas of fog will hang around overnight Saturday and into the part of Sunday morning. Some places across the Lehigh Valley will have to navigate through some dense fog where the visibility will be less than one mile.

On Sunday at 1:23 a.m. a dense fog advisory was issued by the National Weather Service in effect until 9 a.m. for Eastern Montgomery and Upper Bucks as well as Delaware County.

A dense fog advisory was issued by the National Weather Service on Saturday at 11:28 p.m. in effect until Sunday at 7 a.m. for Northern Worcester and Southern Worcester as well as Franklin, Middlesex,