Patchy dense fog will develop this evening and will become more widespread near midnight resulting in visibility near zero at times.
The dense fog will persist into Monday morning and is expected to become patchy Monday afternoon.
Visibility may be significantly and suddenly reduced to near zero. Travel is expected to be hazardous due to reduced visibility.
Fog advisories are issued when near zero visibilities in fog are expected or occurring.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm.