Experts warn strong El Niño could bring record sea levels to California coast with flooding concernsExperts are warning that a strengthening El Niño could trigger coastal flooding, beach erosion and record sea levels along the California coast. Experts are warning that a strengthening El Niño could trigger coastal flooding, beach erosion and record sea levels along the California coast. Experts are warning that a strengthening El Niño could trigger coastal flooding, beach erosion and record sea levels along the California coast. Experts are warning that a strengthening El Niño could trigger coastal flooding, beach erosion and record sea levels along the California coast. MORE: El Niño is strengthening: Here's what it means for the USSwain said the current El Niño is expected to intensify significantly.