A "super fog" warning is in effect from 3 a.m. to 9 a.m. Monday for the southeastern Polk County, where a large brush fire is still smoldering, according to Ric Kearbey, a 10Weather WTSP meteorologist.
"There will be a near zero visibility on roads in that area," he said.
A "super fog" occurs when heavy smoke mixes with heavy natural fog.
The fire, which was largely contained over the weekend, started in the middle of last week.
More than 5,000 acres were burned. The fire blanketed roads in smoke, consuming camp facilities, destroying about a dozen homes and forced 800 homes to be temporarily evacuated. Residents have since returned home.