A Dense Fog Advisory continues for north-central and southern Minnesota, as well as northwest Wisconsin, through Monday afternoon. I know this might be hard to believe, but the visibility is ...

Poor visibility creates challenges to pilots and hampers flight operations. Aircraft uses a ground-based navigation called the Instrument Landing System (ILS).

A dense fog advisory was issued by the NWS Hanford CA on Friday at 9:41 p.m. Visibility one quarter mile or less in dense fog for Merced - Madera - Mendota until 10 a.m. Saturday. "Low visibility ...