Possible road closures tomorrow: hwy 401 ON

Forecast model depiction of precipitation type and impactful weather from Tuesday into Wednesday

A significant winter storm is set to impact southern Ontario and Quebec starting tomorrow and lasting into Wednesday. Mixed precipitation should begin tomorrow morning/afternoon and lasting into Tuesday night. Strong winds will develop on Wednesday creating reduced visibility near blizzard criteria.

Below are the forecasted road conditions around Toronto at various times:

Weatherlogics Inc road conditions forecast for 11pm (eastern time) on Tuesday

Point forecast at 10am Wednesday for hwy 401 at Newcastle, ON. Map created by Weatherlogics Inc showing 31cm of accumulated snow, heavy blowing snow and possible highway closures

Highway conditions around 5pm (eastern time) east of Toronto. Map created by Weatherlogics Inc, showing possible highway closures (in purple)

Since the amounts of snow will be minimal west-southwest of Toronto, where the strongest winds are expected to be on Wednesday, blizzard conditions may be reduced. However, any snow that has fallen will be easily blown around causing drifting of snow and reduced visibility on Wednesday.

Intensifying Low pressure on Wednesday and blizzard-like conditions on its backside