US: Adverse winter weather forecast across eastern and northeastern mountainous areas through at least early Nov. 23

Adverse winter weather is forecast across mountainous parts of the eastern and northeastern US through at least early Nov. 23. A low-pressure system is expected to bring heavy snowfall over elevated parts of the region over the coming days, with snowfall accumulations of over 30 cm (12 inches) possible in the central Appalachians through early Nov. 23 and accumulations of over 20 cm (8 inches) possible in the higher elevations of Pennsylvania and Upstate New York. Hazardous travel conditions are likely due to slippery roads and reduced visibility caused by blowing snow.

As of early Nov. 21, the National Weather Service (NWS) has issued winter storm warnings across parts of central and northeastern West Virginia, far northwestern Maryland, northeastern and southwestern Pennsylvania, and central New York. Winter storm watches are in place for parts of east-central and northern Pennsylvania and west-central New York. Winter weather advisories are in place across much of the rest 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 over the coming days. 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.