US: Adverse winter weather forecast across west-central regions through at least early March 16

Adverse winter weather is forecast across parts of the west-central US through at least early March 16. A winter storm system is expected to bring heavy snowfall particularly in elevated areas across parts of the central Rockies March 13 before spreading into the Four Corners Region late March 14. Snowfall accumulations of more than 15 cm (6 inches) are likely over elevated parts of the region, with more than 60 cm (24 inches) possible over some mountain ranges. Snowfall rates of 2.5-7.5 cm (1-3 inches) per hour are possible across the region, even at lower altitudes, and will lead to hazardous travel conditions due to reduced visibility caused by blowing snow.

As of early March 13, the National Weather Service (NWS) has issued winter storm warnings across parts of central Montana, central, northern, and southern Wyoming, and central, northern, and southern Colorado. Winter storm watches have been issued for parts of northern and southern Colorado, southern Utah, central and northern Arizona, and central and northern New Mexico. Winter weather advisories are in place across much of the rest of the affected area and high wind warnings, watches, and advisories have been issued across parts of the region. 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 further 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.