Washington, Oregon and Northern California Brace for 5–10 Inches of Rain as Another Atmospheric River Approaches
WASHINGTON — A new round of heavy Pacific moisture is preparing to slam into Washington, Oregon, and northern California, raising serious concerns about flooding, river rises, and landslides. Forecast models show that another intense atmospheric river will impact the region this week and into early next week, continuing an already active and saturated storm pattern across the Pacific Northwest.
Widespread 5–10 Inches of Rain Expected
Meteorologists say model guidance indicates widespread rainfall totals of 5 to 10 inches, with locally 11+ inches in higher mountain elevations. The heaviest precipitation is expected along the Washington Cascades, Oregon coastal ranges, and northern California mountains, where persistent moisture bands will repeatedly move inland.
The latest ECMWF precipitation map highlights multiple areas exceeding 8, 9, and even 11 inches of total rainfall by December 23.
Saturated Ground Increases Flood and Landslide Risk
Because the past several storms have already produced significant rainfall, the soil across much of the Pacific Northwest is fully saturated. This means any additional heavy rain could trigger flash flooding, river flooding, and landslides, especially in steep terrain and low-lying basins.
Officials warn that even moderate rainfall rates may now lead to rapid runoff and dangerous conditions, given the lack of ground absorption.
Atmospheric River Pattern Persists Into Next Week
This upcoming system is part of a broader, ongoing cycle of repeated atmospheric rivers, which may continue for several more days. Weather agencies urge residents to stay alert for watches, warnings, and localized alerts, especially in flood-prone areas.
Communities across western Washington, western Oregon, and far northern California should prepare for potential travel disruptions, rising rivers, and periods of heavy rain extending through next week. For continued updates on developing weather threats, stay connected with NapervilleLocal.com.
I’ve lived in Naperville long enough to see how quickly our community changes — from new developments downtown to sudden shifts in our Midwest weather. Reporting on Naperville news and daily forecasts gives me the chance to keep neighbors informed about what really matters. My goal is simple: deliver clear, timely updates so you always know what’s happening in our city and what to expect from the skies above.