Canada, US: Adverse winter weather conditions forecast across parts of southeastern Canada and the northeastern US through early Dec. 5

Adverse winter weather conditions are forecast across parts of far southeastern Canada and the northeastern US through at least early Dec. 5. An ongoing winter storm system over the region is forecast to bring additional snowfall accumulations of up to 25 cm (10 inches) across parts of the affected area. The system is forecast to weaken through Dec. 4 and into early Dec. 5. Hazardous driving conditions are likely across the affected areas due to icy roads and reduced visibility caused by blowing snow.

As of early Dec. 4, Environment Canada has issued red snowfall warnings across much of Nova Scotia, parts of southern Quebec, and far southeastern Ontario. Special weather statements for heavy snowfall are in place for parts of northern Nova Scotia and weather advisories for parts of southeastern Ontario.

The US National Weather Service (NWS) has issued winter storm warnings across much of Maine and parts of northern New Hampshire, northern Vermont, and northeastern New York. Winter weather advisories are in place for parts of northern and southern Maine, central New Hampshire, central and northern Vermont, and northwestern New York.

Officials will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

Snow accumulations are likely across 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 also likely 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 precautionary measure 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.