Canada: Adverse winter weather forecast across parts of southeastern Canada through at least Dec. 22 /update 1

Adverse winter weather is forecast over parts of southeastern Canada through at least Dec. 22. Heavy rainfall that has been affecting the region in recent days will transition to snowfall through Dec. 21, with freezing rain also possible in places. Snowfall accumulations of 20-50 cm (8-20 inches) are possible across parts of the affected region, as well as strong winds gusting up to 100 kph (62 mph). Hazardous travel conditions are likely due to slippery roads and reduced visibility caused by blowing snow.

As of early Dec. 21, Environment Canada is maintaining red rainfall warnings (the highest level on a three-tier scale) across parts of central, southern, and western Newfoundland and eastern and southeastern Nova Scotia. Red winter storm warnings have been issued across parts of central, northern, southern, and western Newfoundland and freezing rain warnings for parts of central and eastern Nova Scotia. Red wind warnings are in place for parts of eastern Newfoundland and western and west-central Nova Scotia. Special weather statements and advisories for blowing snow are in place for parts of southeastern Labrador and eastern and northwestern Newfoundland. Officials could update and possibly extend the coverage of weather alerts over the coming hours.

Snow accumulations are likely across the parts of the affected area. Lesser snowfall totals are possible where sleet and freezing rain mix with snow. In addition to the heavy snow, strong wind gusts could lead to periods of blowing and drifting snow. Blizzard conditions are possible. Sporadic power outages may occur throughout the affected area.

The inclement weather will likely cause widespread ground and air transport disruptions across the affected areas. Traffic and commercial trucking delays are probable along regional highways. Dangerous and challenging driving conditions are likely, especially on secondary and rural roads, as maintenance crews prioritize clearing major routes. Authorities will likely close stretches of highways if driving conditions become too hazardous. Gusty winds will threaten to topple high-profile vehicles throughout the affected areas. Mountain passes and tunnels will probably be closed as a precaution during periods of intense snowfall. The disruptive weather will likely cause delays and cancellations at airports in the affected regions. Heavy, wet snow and strong winds could bring down power lines and trees with foliage.