Sacramento, CA – A powerful and moisture-rich Pacific storm track may impact the entire West Coast during the Thanksgiving travel window, as new federal outlooks show a 40–50%+ chance of above-normal precipitation from November 23 through November 29. The setup favors lowland rain, mountain snow, and potential travel delays across Washington, Oregon, and California during one of the busiest travel weeks of the year.
According to the Climate Prediction Center’s 8–14 Day Outlook, multiple storm systems are expected to push inland, hitting the region in waves. In Washington and Oregon, low elevation cities—including Seattle, Tacoma, Portland, Salem, and Eugene—are likely to see periods of steady or heavy rain. Winds may strengthen with each frontal passage, reducing visibility and causing delays on I-5 and coastal highways.
The Cascades in both states face the highest winter-weather impact. Snoqualmie Pass, Stevens Pass, White Pass, Santiam Pass, and Willamette Pass may see moderate to heavy snow, creating slick conditions, reduced visibility, and potential chain requirements.
Farther south, Northern and Central California will also be targeted by multiple rounds of rain. The Sacramento Valley, Bay Area, and Central Valley—including San Francisco, San Jose, Modesto, and Fresno—expect cold rain and breezy conditions. However, the Sierra Nevada faces a strong chance of accumulating snow, especially near Donner Pass, Echo Summit, and Lake Tahoe, which could see travel slowdowns on I-80 and US-50.
In Southern California, including Los Angeles, Ventura, Orange County, and San Diego, rain chances increase as the pattern deepens. While coastal areas and valleys remain too warm for snow, the San Bernardino and San Gabriel Mountains may see light to moderate snowfall, impacting higher passes such as CA-330 and CA-18.
Thanksgiving week brings heavy travel along I-5, US-101, I-80, and major airport hubs from Seattle to San Diego. Both heavy rain and mountain snow may contribute to delays.
Forecasters expect clearer system timing early next week as short-range models lock onto specific storms approaching the coast.
