|Quick moving snow showers rapidly iced roads on Montreal's South Shore on Tuesday around 11am. Police were forced to close several highways. (Photo: David Sedell - Global News)|
An arctic front will slide across the St. Lawrence Valley after midnight and usher in very cold air. From today's highs, temperatures will fall all day Thursday and reach -15C by late in the day. Overnight lows on Friday morning could be in the -20's. Strong gusty winds will occur with and after the frontal passage and result in very cold wind chill values. More light snow is forecast for Saturday with a slight moderation in temperatures before we dive into the deep freeze early next week.