Eureka, CA — Higher-than-normal tides are expected along the Northern California coastline during the first week of December, potentially causing minor coastal flooding in vulnerable low-lying areas, according to the National Weather Service in Eureka.
Forecasters say a stretch of high astronomical tides will occur from Wednesday, December 3 through Sunday, December 7, affecting Humboldt Bay, Crescent City, and the Mendocino Coast. While widespread flooding is not expected at this time, some morning high tides may reach levels capable of producing localized flooding, particularly in known trouble spots.
For Humboldt Bay, minor flooding typically begins around 8.8 feet, especially in locations such as King Salmon and the Arcata Bottoms. Tide projections for the region show several mornings approaching this threshold, with peak tides between 8.63 and 8.88 feet during the period.
Along the Del Norte Coast, including Crescent City, minor flooding can occur when tides reach 8.9 feet. Forecast highs ranging from 8.44 to 8.84 feet suggest the area may experience brief water overflows in low-lying zones.
Farther south near Mendocino County, minor flooding can start around 7.9 feet. Tide forecasts for Arena Cove show highs near and above this level throughout the week, with several mornings exceeding 7.3 to 7.6 feet.
Weak southerly winds, if they develop, could push water levels even higher than the predicted astronomical tides. Currently, strong wind-driven surges are not expected, but forecasters note that any increase in onshore flow could elevate the risk.
Residents and visitors are encouraged to stay aware of conditions, especially during morning high tides, and avoid parking or walking in low-lying coastal areas prone to flooding.
