Summary

Sea levels in California are set to rise by as much as a foot (30 centimeters) in the coming days as an enormous wave washes up the U.S. West Coast. The huge surge of energy, known as a "coastal trapped wave" or a "Kelvin wave," is part of El Niño , a months-long phenomenon in the Pacific Ocean that scientists say could generate powerful storms and floods in some parts of the world while leaving others in drought.

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