Patchy, dense fog is ongoing across Laramie County tonight with visibilities at and below one half mile along Interstate 80 from mile marker 355 to mile marker 380. Patchy dense fog is also ongoing along Interstate 25 from mile marker 5 to mile marker 35. Fog may slowly spread eastward overnight. Patchy, dense fog will continue into the morning hours with the potential for brief visibility improvements overnight. Motorists are urged to use caution while traveling along Interstate 80 and Interstate 25. Be prepared for sudden drops in visibility.