Near zero visibility in fog is expected or occurring.
Locally dense fog is expected to develop tonight and persist into early Friday morning before dissipating.
Visibility may be significantly and suddenly reduced to near zero. Travel is expected to be hazardous due to reduced visibility in some locations.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or tweet reports using #ONStorm.