Dense Fog in Santa Cruz County, Arizona

Widespread dense fog covered portions of Southeast Arizona, including the Tucson Metro Area. An NWS meteorologist on duty at the time reported that the visibility was down to 1/10 of a mile at the NWS Tucson office, located on the University of Arizona. Also several calls came in from spotters around the Tucson Metro area reporting areas of visibility as low as 20 feet. A cooperative observer from Picacho Peak State Park reported that visibility was down to 1/4 mile and at 5 a.m. the Nogales ASOS reported visibility down to 1/4 mile. The fog persisted until about 9 a.m.