Over a single weekend, the decaying core of Tropical Storm Rachel surged northward, delivering a rare combination of heavy rain, unusually high surf and destructive flooding to the Pacific coast of the United States and Mexico. Cities that normally enjoy mild autumn weather found themselves grappling with water levels more typical of a storm-season hurricane.
Coastal havoc in Southern California
Long Beach bore the brunt of the onslaught. Waves that exceeded five metres smashed into shoreline properties, shattering a boardwalk and forcing residents to abandon their homes. City officials later classified nine structures as unsafe, issuing red-tag warnings that barred entry until repairs could be made. The damage forced the municipality to dip into its emergency reserve, costing more than $1 million. In Newport Beach, officials declared a local emergency, temporarily closed the Balboa and Newport piers, and warned drivers to avoid the flooded Peninsula streets. By Monday, crews had reopened the piers, but repeated cautions remained in place for beachgoers.
Emergency crews worked around the clock, loading sandbags onto trucks and reinforcing weakened bulkheads with timber. Mayor Rex Richardson emphasized that the infrastructure was not built for such prolonged surf, urging residents to stay vigilant. The post-tropical cyclone nature of Rachel meant that, despite losing its official storm status, the system retained enough energy to push water several feet above predicted tide levels. The Los Angeles Harbor tide gauge recorded a peak of 7.7 feet, roughly 1.6 feet higher than forecasts.
Rainfall records and flash flooding in Nevada and Mexico
Even inland, the storm’s moisture left a mark. Las Vegas set an all-time October daily rainfall record, measuring 1.08 in (2.74 cm) before sunrise on Sunday. The National Weather Service in Las Vegas warned of continued flash-flood risk across southern San Bernardino County, noting a 40 % chance of excessive rain later that night.
South of the border, the overlapping impacts of Rachel and the nearby Hurricane Simon intensified the humanitarian crisis. In the Mexican state of Guerrero, a 71-year-old man was killed when a wall collapsed in Chilpancingo. The storm also claimed four members of a single family, including two children, whose bodies were recovered on the outskirts of Ensenada, Baja California. Local prosecutors reported that 32 people were rescued by helicopter and that more than 50 displaced residents were housed in temporary shelters.
Although Simon never made landfall, it weakened to a Category 2 system before moving away from the coast. Nevertheless, the National Hurricane Center warned that lingering rains could trigger life-threatening floods and mudslides in the Pacific states of Michoacán and Colima. Coastal communities were also advised to expect wave heights of up to five metres.
El Niño’s role and expert outlook
The extraordinary intensity of these storms aligns with a historically strong El Niño pattern that has been supercharging the Pacific Ocean this year. Researchers at Colorado State University, led by Phil Klotzbach noted that “the last month has been ‘berserk’” and that “everything that forms is just lasting a long time and getting really powerful.” NOAA’s seasonal models predict that this could become a record-breaking El Niño, bringing prolonged wet periods, increased landslide risk and higher tides across the West Coast.
In addition to immediate damage, the broader climate implications are sobering. Scientists link the amplified storm activity to both the natural El Niño cycle and anthropogenic warming, suggesting that future events may become even more severe. Communities from Long Beach to Ensenada are now reassessing building codes and emergency plans to better withstand a new normal of extreme weather.
While recovery efforts are already underway—sandbags are being placed, damaged piers are being inspected, and state agencies are coordinating aid—the true scale of the aftermath is likely to unfold over the coming weeks. Officials in Long Beach have signaled that they will seek assistance from both the state governor and federal authorities, acknowledging that the damage will not be repaired within a single weekend.
