US: Adverse winter weather forecast in some northern areas through at least Feb. 8

Adverse winter weather is forecast across parts of the northern US through at least Feb. 8. A low-pressure system is likely to bring a mix of snow, freezing rain, sleet, and rain across the northern plains over the coming days. Snowfall accumulations of 5-10 cm (2-4 inches) are forecast across parts of eastern Montana and western North Dakota, and light ice accumulations are possible in some areas of the affected region. Avalanches are possible in mountainous parts of the region due to precipitation loosening the snowpack. Hazardous driving conditions are likely in some areas due to slippery roads and reduced visibility caused by blowing snow.

As of Feb. 7, the National Weather Service (NWS) has issued winter storm warnings across parts of central Idaho and west-central Montana. Avalanche warnings are in place for parts of central and eastern Idaho and southwestern Montana. Winter weather advisories have been issued across much of the rest of the affected region. Officials could update and possibly 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 over the coming days. Traffic and commercial trucking delays are possible along regional highways. Dangerous and challenging driving conditions are also likely on secondary and rural roads in the affected states as maintenance crews prioritize clearing major routes. Authorities could close stretches of highways if driving conditions become too hazardous. Flight delays and cancellations are likely due to ground stops and deicing operations at airports in the region.