Canada, US: Adverse winter weather forecast across parts of western Canada and southeastern Alaska through at least early Dec. 4

Adverse winter weather is forecast over parts of western Canada and southeastern Alaska through at least early Dec. 4. A frontal system moving into the region from the Pacific is forecast to bring heavy snowfall to parts of southeastern Alaska, northern British Columbia, and southern Yukon, as well as strong winds and heavy rainfall for some coastal areas and freezing rain to interior areas of central, northwestern, and western British Columbia. Snowfall accumulations of up to 50 cm (20 inches) are possible through early Dec. 4 in areas of northern British Columbia and southern Yukon around Watson Lake. Hazardous travel conditions are likely across the affected region due to slippery roads and reduced visibility caused by blowing snow.

As of early Dec. 2, Environment Canada has issued red snowfall warnings (the highest level on a three-tier scale) across parts of northern British Columbia and southern Yukon. Red freezing rain warnings have been issued for parts of central, northwestern, and western British Columbia, and a grey special weather statement for heavy rainfall and strong winds is in place for coastal areas around and south of Prince Rupert, British Columbia.

The US National Weather Service has issued winter storm warnings, winter weather advisories, and special weather statements for strong winds and heavy rainfall for parts of southeastern Alaska.

Officials could update and extend the coverage of weather alerts over the coming hours.

Lesser snow accumulations 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 especially likely on secondary and rural roads as maintenance crews prioritize clearing major routes. Authorities will probably close stretches of highways if driving conditions become too hazardous. Gusty winds will threaten to topple high-profile vehicles throughout the affected areas. As a precaution, mountain passes and tunnels will likely be closed during periods of intense snowfall. The disruptive weather will probably 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.