THUNDER BAY -- The city is expected to spend the rest of Sunday under a fog advisory.
Environment Canada issued the caution just before 4 p.m., warning that the fog might become "more extensive and quite dense" into the evening hours, potentially creating conditions with zero visibility.
Motorists are advised to take their time reaching their destination and to be careful if visibility is reduced.
A number of arriving flights at the Thunder Bay International Airport have been delayed.
The fog is expected to last into Monday.
