Tropical Storm Rachel Remnants Cause Coastal Flooding in Southern California

The remnants of Tropical Storm Rachel, combined with large ocean swells and an El Niño-enhanced Kelvin wave, have triggered significant coastal flooding in Southern California. Newport Beach declared a local emergency on Saturday as streets and beachfront areas experienced inundation from what officials described as "unusually high ocean water levels."

Main thoroughfares such as Balboa Boulevard and adjacent streets in Newport Beach have been submerged by floodwaters since Friday. The city's beaches and piers were closed until further notice, and residents were advised to avoid flooded areas due to safety risks. The coastal flood warning issued by the National Weather Service for Orange County beaches extends through Tuesday afternoon, anticipating potentially substantial flooding and beach erosion.

Other coastal cities, including Laguna Beach, Huntington Beach, and San Clemente, were distributing sandbags on Sunday in anticipation of possible flooding. In Seal Beach, parking lots at the beach were closed as a precautionary measure against elevated surf and coastal flooding concerns.

Tropical Storm Rachel officially became post-tropical late Saturday night, but its remnants, along with a separate storm system over the Western U.S., continue to pose a flash flood threat to parts of the Southwest, including Southern California, northwest Arizona, southern Nevada, and southwest Utah. Gusty winds and heavy rain from the storm's outer bands also brought isolated flooding and debris flow to parts of Southern California, with wind gusts exceeding 60 mph reported in Menifee and Temecula. Near Phoenix, Arizona, Saturday saw a dust storm with near-zero visibility.

The highest tides were anticipated on Sunday, exacerbating concerns for beach erosion and further flooding of coastal roads and paths.