The first significant snow of the season will arrive on Sunday, with 10 to 20cm possible from Montreal north and west into the Ottawa Valley and the Laurentians. Travel will be difficult at best.
Snowfall Warning in effect for metro Montreal, eastern Ontario and the Ottawa Valley for Sunday.
The first significant snowfall of the season is expected Sunday into Monday across portions of southern Ontario into southwestern Quebec. Low pressure will move down the St. Lawrence Valley on Sunday and east of Montreal into New England on Monday.
The warmer temperatures of early Saturday are gone for at least the next week if not longer. Montreal reached 10C (50F) during the overnight hours as a warm front lifted across the region. That was quickly followed by a cold front, gusty northwest winds, flurries and dropping temperatures for most of Saturday. Overnight lows by Sunday morning will be near -1C (30F) and remain nearly stationary all day Sunday.
Snow will overspread the region Sunday morning, possibly mixed with freezing rain or rain south of the St. Lawrence River, with all snow north of the valley. Expect 5 to 10cm of snow on Sunday in Montreal, with an additional 5 to 10cm by Monday morning. Roads will become snow covered and slippery. Northeast winds of 20-40km/h will make it feel even colder, and lower visibilities in steady snow. This will be a shock for many, as Montreal has barely had a snowflake or any frost so far this fall.
Driving conditions will become very poor on area highways, especially as this is the first snow of the season, and most drivers are not prepared. Leave the car at home if you do not have winter tires installed. Consider changing travel plans if possible and perhaps working from home on Monday.
Colder air will filter in behind the low Sunday night, changing any mixed precipitation back to all snow. Temperatures will remain at or below 0C (32F) throughout Monday. The week ahead will remain unsettled and cold with more flurries possible through Wednesday.
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