TUCSON, Ariz. - Southern Arizona drivers should be on the lookout for fog Friday morning.
The National Weather Service issued a Dense Fog Warning for parts of Southern Arizona, including the Tucson metro area, Nogales, Sells, Green Valley, Marana, Vail, Picacho Peak State Park, Vail, Mammoth, Oracle, Sierra Vista, Benson, Willcox, Clifton and Safford.
Visibility could be restricted to less than one mile in the dense fog.
The advisory lasts until 9 a.m.
