06 Mar 2023 | 10:03 AM UTC
US: Adverse winter weather forecast to continue over western regions through at least March 8 /update 1
Adverse winter weather forecast across parts of the western US through at least March 8. Hazardous travel conditions likely.
Event
Adverse winter weather is forecast to continue across parts of the western US through at least March 8. Rounds of light to moderate snowfall are expected in parts of northern and central California and southwestern Oregon over the coming days before a more organized weather system moves in from the Pacific Ocean, bringing heavier snow especially over elevated areas. Additional snowfall accumulations of 30-60 cm (12-24 inches) are expected in some mountainous parts of the affected area March 6-8. Strong winds could also combine with snowfall to cause blizzard conditions, especially in elevated areas. Hazardous driving conditions are likely across the affected area due to icy roads and reduced visibility caused by blowing snow.
Authorities in California declared a state of emergency March 1 for 13 counties affected by a series of winter storms that have struck the state over recent days. Some elevated areas have received more than 250 cm (100 inches) of snowfall over the past week.
Government Advisories
As of early March 6, the National Weather Service (NWS) has issued winter storm warnings for parts of northeastern and eastern California and avalanche warnings have been issued for parts of eastern California. Winter weather advisories are in place across much of the rest 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 possible 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.
