Environment Canada has issued fog advisories for most of Alberta on Sunday morning.
The department asks travellers to be cautious as dense fog patches create conditions for very low visibility while driving.
This can occur suddenly with visibility being reduced to near zero.
If visibility is reduced while driving, Environment Canada recommends slowing down, watching for tail lights ahead and being prepared to stop.
The fog is expected to improve for most regions by noon but may redevelop into the evening.
The advisory is in effect for the following regions:
Bonnyville - St. Paul - Cold Lake - Lac La Biche
Brooks - Strathmore - Vulcan
Cardston - Fort Macleod - Magrath
Drumheller - Three Hills
Fort Saskatchewan - Vegreville - Redwater - Smoky Lake
Grande Prairie - Beaverlodge - Valleyview
Hanna - Coronation - Oyen
Leduc - Camrose - Wetaskiwin - Tofield
Lloydminster - Wainwright - Vermilion - Provost
Medicine Hat - Bow Island - Suffield
Peace River - Fairview - High Prairie - Manning
Red Deer - Ponoka - Innisfail - Stettler
Whitecourt - Edson - Fox Creek - Swan Hills