US: Adverse winter weather forecast across north-central regions through at least early Dec. 10

Adverse winter weather is forecast across parts of the north-central US through at least early Dec. 10. A low-pressure system just north of the US-Canada border will bring strong winds and heavy snowfall across parts of the northern plains and into the western Great Lakes. Blizzard conditions are possible in parts of eastern Montana and snowfall accumulations of 10-18 cm (4-7 inches) are likely in parts of northern Minnesota, with higher accumulations of over 30 cm (12 inches) possible in mountainous areas. Hazardous travel conditions are likely due to reduced visibility caused by blowing snow.

As of early Dec. 10, the National Weather Service (NWS) has issued blizzard warnings for parts of eastern Montana and winter storm warnings across parts of northern Minnesota, north-central Montana, far northeastern Wyoming, and far western South Dakota. Winter advisories are in place across much of the rest of the affected area, and high wind warnings and wind advisories have been issued across parts of the affected area. Officials could update and extend the coverage of the weather alerts over the coming days.

Snow accumulations are likely across the affected region, especially at higher elevations. Lesser accumulations are possible where sleet and freezing rain mix with the snow, and precipitation is less intense. In addition to the heavy snow, strong wind gusts will likely lead to periods of blowing and drifting snow in some areas. Sporadic power outages could occur throughout the affected region.

The winter weather will likely cause ground and air transport disruptions across the region. Traffic and commercial trucking delays are probable along regional highways. Dangerous and challenging driving conditions are likely on secondary and rural roads in the affected states as maintenance crews prioritize clearing major routes. Authorities will probably close stretches of highways if driving conditions become too hazardous. Flight delays and cancellations are likely due to ground stops and deicing operations at regional airports.