22 Dec 2022 | 04:03 PM UTC
US: Adverse winter weather forecast over northwestern regions through at least Dec. 25 /update 1
Adverse winter weather forecast across parts of the northwestern US through at least Dec. 25. Hazardous travel conditions likely.
Event
A storm system is expected to bring a mix of wintry precipitation, including freezing rain, snowfall, and rain, as well as strong winds across parts of the Northwest US through at least Dec. 25. Snowfall is expected initially late Dec. 22 before transitioning to freezing rain Dec. 23. Ice accumulations of more than 0.6 cm (0.25 inches) are expected across parts of western Washington and Oregon over the coming days. Snowfall accumulations of more than 15 cm (6 inches) are possible in elevated parts of the affected area. Hazardous travel conditions are likely due to icy roads and reduced visibility caused by blowing snow.
Government Advisories
As of Dec. 22, the National Weather Service (NWS) has issued ice storm warnings for parts of western Oregon. Winter storm warnings have been issued across parts of central and southern Washington and central and northern Oregon. Winter storm watches have been issued for parts of central, northern, and western Washington and winter weather advisories for parts of southeastern Washington, much of Oregon, far northern California, and western Idaho. Wind chill warnings and watches are also in effect across parts of the affected area. Officials could update and possibly extend the coverage of weather alerts over the coming days.
Hazardous Conditions
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 are 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.
Transport
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.
Advice
Monitor local media for updated weather information. Verify road conditions before driving in areas where heavy snowfall is forecast. Allow extra time to reach destinations in these areas and carry an emergency kit and warm clothes if driving is necessary, especially on secondary or rural routes that could become impassable. If routing shipments by truck through the affected area, plan accordingly for delivery delays. Confirm flights. Charge battery-powered devices in the case of prolonged electricity outages.
