The National Weather Service in Fort Worth issued a dense fog advisory Wednesday morning. All North Texas counties — including Dallas, Denton, Collin, Ellis and Tarrant — were under the advisory, which expired at 10 a.

The NWS Fort Worth TX issued a dense fog advisory at 7:12 a.m. on Tuesday in effect until 10 a.m. The advisory is for Grayson, Fannin, Denton, Collin, Parker, Tarrant, Erath, Hood, Somervell and Comanche counties.

Following a foggy Wednesday morning, visibility continued to improve as a warm front lifted north. Visibility was down to a quarter mile at times during the Wednesday morning commute while temperatures hovered in the 40s ahead of the warm front.