Winter storm alerts in Oregon and Nevada are warning of "extensive" power line damage due to wet snow and high winds, the National Weather Service (NWS) has warned.
In Oregon, winter storm warnings are in place across Siskiyou County where the NSW warns "strong winds could cause extensive damage to trees and power lines." The warnings are in place until 4 p.m. PST on Wednesday.
Winds of up to 65 mph and heavy wet snow accumulations of between 5 and 10 inches are expected in western, north-central and southeastern parts of the county.
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Wind gusts in the southern central areas of Siskiyou County are estimated to be up to 60 mph.
Across the county, the NSW warns that travel conditions will be difficult with the Wednesday morning commute likely affected. If you must travel, the NSW advises keeping a flashlight, food and water in your car in case of emergency.
In Nevada across the Greater Lake Tahoe area, a winter storm warning is in place until Thursday 1 a.m. PST. Extensive damage to power lines and trees is expected due to winds gusting up to 50mph in the Sierra valleys and over 100 mph along the Sierra crest.
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Snow accumulations of 1-4 inches are expected on the western side of Tahoe and up to 2 inches on the east side. Areas between 6,000 and 7,000 feet could see a mix of rain, snow and sleet.
NSW Reno warns travel may be difficult in mountainous areas and advises that all travel restrictions in the area should be heeded.
There is a winter weather advisory in place across the Lassen-Eastern Pluma and Eastern Sierra Counties in Nevada. This is expected to bring wet snow above 7,000ft and winds of up to 45 mph. However, power line damage is not expected.
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Storm warnings are also in place across Washington state and Northern California.
The NWS warns that in Washington, the West Slopes North Cascades and Passes could expect winds up to 45 mph and snow accumulations of between 12 and 24 inches above 4,000ft. Power outages, the service warns, may be likely and travel "very difficult." This warning is in place until Thursday 4 p.m. PST.
In Northern California across western Plumas County and the West Slope Northern Sierra Nevada, a winter weather advisory remains in place until Friday night with the NSW warning of snow above 5,500 feet and winds of up to 45 mph.
Commutes Wednesday through Friday in this area will likely be affected due to snow-covered roads, chain controls and trees brought down by winds.
The impacts are expected to arrive in two waves—the first wave will arrive on Wednesday with snow falling between 5,500 and 6,000 feet. This will be followed by a lull in snowfall on Thursday morning. The second wave will come Thursday afternoon through Friday when snow is expected at 4,500 to 5,000 feet.
The Northern Trinity region in California will also be impacted by wet snow—above 5,000 feet on areas including the Scott Mountain Pass—until 9 p.m. PST tonight.
Road conditions for each state can be accessed by calling 511.
Newsweek has emailed the NSW for comment.