US: Adverse winter weather forecast over eastern and northeastern regions through at least early Jan. 17 /update 1

Adverse winter weather is forecast across parts of the eastern and northeastern US through at least early Jan. 17. A fast-moving winter storm system moving up from the southern US is expected to move quickly over the region Jan. 16, bringing heavy snowfall accumulations across much of the affected area, as well as some mixed wintry precipitation to coastal areas. Snowfall accumulations of 2.5-15 cm (1-6 inches) are likely across the affected area, with localized higher amounts. Hazardous driving conditions are likely across the region due to slippery roads and reduced visibility caused by blowing snow.

As of early Jan. 16, the National Weather Service (NWS) has issued winter storm warnings across parts of eastern Kentucky, northern and far western Virginia, West Virginia, Maryland, southeastern Pennsylvania, and central and northern Maine. Winter weather advisories have been issued across much of the rest of the affected area. Officials could update and possibly extend the coverage of weather alerts over the coming days.

Snow accumulations are likely across the affected area, 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 area.

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 regional airports.