Redding, CA – Northern California is expected to face heavy rain, flooding risk, strong winds and widespread mountain snow from December 20 through early January, according to a briefing from the NOAA Climate Prediction Center. The agency says a strengthening Pacific storm pattern will direct multiple atmospheric rivers into the region shortly before Christmas.
Forecasters report that atmospheric river activity is likely to expand south from Oregon into Northern California by December 22, bringing a moderate risk (40–60%) of heavy precipitation from December 22–26. NOAA says the zone of concern will stretch from the northern counties through west-central California, with additional heavy-rain potential extending as far south as the Mexican border.
Given recent rainfall and already saturated soils across parts of the Sacramento Valley and coastal ranges, NOAA warns that flooding could persist into late December, especially along rivers and in low-lying areas. Mudslides and debris flows may also become a hazard in steep terrain and burn scar regions.
High winds are expected at times as enhanced onshore flow pushes into the state. Gusts may become strongest along the North Coast, coastal headlands, and high mountain ridges. Meanwhile, the Sierra Nevada is projected to receive moderate-to-heavy high-elevation snow from December 20–26, complicating holiday travel across major mountain passes.
Forecasters say the stormy pattern is supported by La Niña, which is expected to maintain periods of enhanced moisture into the New Year. Elevated precipitation probabilities continue for early January, with multiple storm waves possible.
Residents are encouraged to monitor NWS Bay Area, Sacramento and Eureka offices for flood watches, wind alerts and winter storm warnings as conditions evolve.
