Dense fog patches in the area.What :Local dense fog patches possibly giving zero visibility.Where: Sept-ÎlesThe North Shore of Montreal, the Laurentians, Tremblant, Lanaudière, the Mauricie, the Upper Gatineau and Mont-Laurier.When :Overnight tonight.Additional information:Fog patches could produce difficult travel conditions due to reduced visibility. The fog will dissipate in the late overnight hours or on Sunday morning.###Visibility will likely be suddenly reduced at times.Fog advisories are issued when near-zero visibility in fog is expected.Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to QCstorm@ec.gc.ca or post reports on X using #QCStorm.