Prolonged Storm Pattern to Impact Western U.S. Through November
A significant and prolonged storm pattern is set to impact California and much of the western United States from November 13 through late November, with activity potentially extending into December (Alpha Weather Analysis, 2026-11-10). Multiple Pacific storm systems, driven by a split jet stream, will bring periods of rain, thunderstorms, gusty winds, and mountain snow to Northern, Central, and Southern California, as well as Arizona, Nevada, Utah, Idaho, and Colorado. Northern California will experience the earliest impacts, including heavy rainfall and strong winds, while higher elevations in the Sierra Nevada and Wasatch Mountains may see accumulating snow. The potential involvement of atmospheric rivers could lead to significant rainfall and localized flooding in some areas.