Canada, US: Adverse winter weather conditions forecast across parts of southeastern Ontario, Canada, and the interior northeastern US Dec. 19

Adverse winter weather conditions are forecast across parts of southeastern Ontario, Canada, and the interior northeastern US Dec. 19. Lake-effect snow is expected downwind of the Great Lakes and snowfall accumulations over the central Appalachian mountains early Dec. 19 before conditions improve throughout the day. Strong winds are forecast across the region and the combination of heavy snowfall and gusty winds may cause blizzard conditions in the affected region. Cold temperatures are also expected across the region. Hazardous driving conditions are likely across the affected areas due to icy roads and reduced visibility caused by blowing snow.

As of early Dec. 19, Environment Canada has issued red snow squall warnings across parts of the Ontarip Peninsula; snowfall totals of 5-20 cm (2-8 inches) and winds gusting up to 80 kph (50 mph) are expected in these areas. Special weather statements for heavy snowfall, blowing snow, and icy roads are in place across other parts of southeastern Ontario.

The US National Weather Service (NWS) has issued winter storm warnings for parts of northeastern Ohio, northwestern and southern Pennsylvania, far western New York, and central West Virginia. Winter weather advisories are in place across the rest of the affected area in the US.

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. 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.