US: Adverse winter weather forecast across central, southern, and eastern regions through at least early Jan. 7 /update 1

As of early Jan. 5, the National Weather Service (NWS) has issued winter storm warnings, winter storm watches, and winter weather advisories for adverse winter weather that is forecast across parts of the central and eastern US through at least early Jan. 7. A major winter storm will affect Kansas to Ohio Valley/Central Appalachians Jan. 5. The storm will reach the Mid-Atlantic region late Jan. 5 and impact the region through early Jan. 7. Heavy snowfall accumulations exceeding 15 inches (38 cm) and wind gusts exceeding 40 mph (64 kph) are expected. Hazardous travel conditions are likely across the affected area due to slippery roads and reduced visibility caused by blowing snow. There is an Enhanced Risk of severe thunderstorms over parts of the Lower Mississippi Valley through early Jan. 6 and a Marginal Risk of severe thunderstorms over parts of the Southeast into early Jan. 7. 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 disrupt ground and air transport 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.