A large Kelvin wave moving north along the West Coast is temporarily raising sea levels and increasing the risk of coastal flooding from California to Washington. The wave formed after strong winds near the equator pushed warm water east across the Pacific, causing sea levels along parts of the coast to rise several inches above normal. Scientists say the effect could combine with high tides and incoming storms over the next week, increasing the chance of flooding in low-lying coastal areas. Kelvin waves are a normal part of the Pacific climate system, but researchers say this one is unusually strong and is arriving as El Niño conditions continue developing.
Why This Matters:
Several inches of additional sea level may not sound dramatic, but it can make a major difference when high tides, heavy rain, and strong surf arrive at the same time. Higher baseline water levels allow flooding to reach farther inland, overwhelm drainage systems more quickly, and make roads or coastal neighborhoods harder to access. With the Kelvin wave expected to affect communities from California through Oregon and Washington, households in flood-prone areas should be ready for transportation disruptions, power outages, and temporary loss of normal services. Keeping emergency supplies on hand and having backup power available can help families stay prepared when coastal flooding disrupts everyday routines.
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Source: PBS NewsHour / Associated Press
By: Martha Bellisle
