A report from the National Weather Service was issued on Sunday at 6:03 a.m. for dense fog until 8 a.m. for Westmoreland Ridges, Fayette Ridges and Higher Elevations of Indiana as well as Mercer, Venango, Forest, Lawrence, Butler, Clarion, Beaver, Allegheny, Armstrong, Washington, Greene, Westmoreland, Fayette and Indiana counties.