The National Weather Service has put in place a dense-fog advisory for most of the state until 10 a.m. Friday.
Areas of dense fog are concentrated toward the east, the weather service said. The following counties are affected: Arkansas, Baxter, Boone, Bradley, Calhoun, Clark, Cleburne, Cleveland, Conway, Dallas, Desha, Drew, Faulkner, Fulton, Garland, Grant, Hot Spring, Independence, Izard, Jackson, Jefferson, Lincoln, Lonoke, Marion, Monroe, Montgomery, Newton, Ouachita, Perry, Pike, Pope, Prairie, Pulaski, Saline, Searcy, Sharp, Stone, Van Buren, White, Woodruff and Yell.
The fog will reduce visibility to a quarter of a mile or less, the advisory says. Drivers are advised to go slowly, leave plenty of room between vehicles and use headlights.