Seattle, WA – A strong Pacific system pushed across Western Washington over the past day, unloading widespread heavy rainfall that measured between 4 and 6 inches across the Cascades and nearly 7 inches in parts of the Olympic Mountains, according to the National Weather Service in Seattle. The 24-hour rainfall period ended at 10 PM PST Thursday.
The storm delivered its most intense precipitation along the windward slopes of the Olympic Peninsula, while areas under the Olympic rain shadow—including sections of the central Puget Sound and the Seattle metro—saw significantly lower totals. A new daily rainfall record was also set in Bellingham, underscoring the strength and reach of this system.
Rainfall Overview Across Western Washington
Meteorologists reported that the Olympic Mountains received the highest totals, with gauges approaching 7 inches in some locations. The Cascades followed closely behind, recording 4 to 6 inches of steady, persistent rain.
The variation in totals across regions was influenced heavily by terrain. Areas shielded by the Olympic rain shadow experienced lighter accumulations compared to the saturated foothills and mountain zones.
The weather service noted,
“This was a widespread, high-impact rainfall event with significant totals across the higher terrain,”
highlighting the potential downstream effects from the rapid runoff.
Record-Breaking Rainfall in Bellingham
Bellingham set a new daily rainfall record, marking one of the standout observations from the storm. While exact record totals will be confirmed by the National Weather Service, the milestone reflects how expansive the storm system became as it moved inland.
The record adds to an already active fall season across Northwest Washington, where several systems have brought above-average rainfall in recent weeks.
Rising Rivers and Flood Concerns
With several inches of rain falling in a short window, hydrologists warn that river levels could rise quickly, especially near the Skokomish River, a basin known to respond rapidly and often prone to flooding during high-rain events.
Localized flooding could occur in low-lying areas, along rural creek crossings, and on roadways where ponding or standing water develops. Drivers are encouraged to heed flood advisories and avoid areas where water covers the road.
Travel Impacts and Reduced Visibility
Transportation officials urge caution across Western Washington as saturated roads, reduced visibility, and isolated debris may create hazardous travel conditions. Mountain passes may continue to see difficult driving due to runoff and shifting weather patterns.
Even in areas with lighter totals, forecasters warn that overnight and early-morning travelers should stay alert for quickly changing conditions.
What Residents Should Know
• Keep watch for updated flood advisories or warnings, particularly for flood-prone rivers.
• Expect delays or slower travel in mountain areas and along rural routes.
• Avoid driving through standing water, as depth and road conditions underneath can be difficult to judge.
• Prepare for additional wet weather, as more systems may follow during the season.
Community Outlook
Forecasters will continue to monitor river responses and update advisories as needed. While the heaviest rain has moved through, lingering moisture and saturated soils mean the region is not in the clear just yet.
Residents across Western Washington are encouraged to stay weather-aware and report any significant flooding or storm impacts to local authorities.
Have you seen high water or flooding in your area after this storm? Share your experiences in the comments below.
