US: Adverse winter weather forecast over south-central regions through at least Dec. 15

Adverse winter weather is forecast across parts of the south-central US through at least Dec. 15. A low-pressure system is expected to bring heavy snowfall over mountainous parts of the affected region, as well as rain and mixed wintry precipitation at lower elevations. Snowfall accumulations of more than 15 cm (6 inches) are likely over parts of the Southern Rockies and High Plains. Snowfall at lower elevations is likely in parts of the Texas and Oklahoma panhandles late Dec. 14-15. Heavy snowfall may combine with blustery winds to cause low visibility and hazardous driving conditions across parts of the affected area.

As of early Dec. 13, the National Weather Service (NWS) has issued winter storm warnings across parts of northern New Mexico and southern Colorado. Winter storm watches are in place for parts of the northwestern Texas Panhandle and western Oklahoma Panhandle. Winter weather advisories have been issued across much of the rest of the affected area and freezing fog advisories are in place for parts of southeastern Wyoming. 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. Blizzard conditions are possible. 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.