From Miami's Biscayne Bay to the cliffs of La Jolla, coastal communities are confronting a new reality: the ocean is creeping higher, and the moon is no longer the main culprit. Meteorologists and oceanographers point to a convergence of climate-driven factors—thermal expansion, shifting atmospheric pressure, and intensifying storms—that are turning routine high tides into flood events.
Carlos Robles, a meteorologist tracking these changes, and Bob Oravec of the National Weather Service warn that the coasts of Florida and California are experiencing an unprecedented rise in sea level. While lunar cycles still play a role, they are only part of a larger, more complex picture. Warmer-than-usual waters, the lingering effects of El Niño, and coastal storms are combining to create recurring emergencies from the Gulf to the Pacific.
More than king tides
The gravitational dance between Earth, the Moon, and the Sun produces dramatic king tides, but experts say these alone cannot explain the expanding floods. In Florida, northeast winds gusting between 35 and 40 mph (56–64 km/h) are pushing massive volumes of ocean water toward inhabited beaches. Ocean temperatures remain unseasonably high, in the upper 70s Fahrenheit, adding energy to the system. The result: water levels that rival tropical storms, even without a named system.
Along the West Coast, the situation is equally dire. El Niño has warmed Pacific waters, causing thermal expansion—the physical swelling of seawater as it heats—which raises overall sea levels. Kelvin waves, vast oceanic pulses of warm water, travel from South and Central America northward, delivering heat and height to California's shores throughout summer and early autumn. This year, those waves have stacked on top of already high tides, pushing water into bayfront homes in Newport Beach and beyond.
Record-breaking water levels
The numbers tell the story. In San Pedro, part of the Port of Los Angeles, water levels hit a historic peak of over 8 feet on October 26, surpassing the previous record set in 2005 and data going back to 1923. La Jolla touched 7.79 feet, while Port Canaveral in Florida logged its highest non-tropical water level since October 1994. Miami secured four records in five days, hinting at an unprecedented ten-day streak of high-water events.
Brian McNoldy, a marine researcher at the University of Miami, and Melbourne meteorologist Megan Tollefsen have been tracking these milestones. Their data underscores a troubling trend: the baseline for what constitutes a 'normal' high tide is shifting upward. Erika Spanger of the Union of Concerned Scientists stresses that communities must prepare for compounding risks, not just single events. As USA TODAY's Dinah Voyles Pulver notes, roads on the Outer Banks have faced emergency closures, and southern California rainfall models show 250% of normal moisture for Halloween weekend—a recipe for further flooding.
Defending vulnerable coastlines
In response, government agencies are deploying advanced monitoring and mitigation strategies. The National Oceanic and Atmospheric Administration (NOAA) is using satellite sensors to conduct permanent technical evaluations across both coasts. Early warnings are being issued to residents from Miami to North Carolina, and municipal crews are reinforcing containment dikes in high-risk zones. Structural inspections of seawalls are underway to prevent major damage from heavy surf.
But experts emphasize that contingency plans must evolve constantly. The persistence of these climatic phenomena demands more agile and coordinated institutional responses. As South Florida king tides turn streets into canals, the urgency is palpable. The failed tire reef experiment serves as a cautionary tale of short-sighted coastal engineering, while flooding turns parking into a costly gamble for drivers.
For Latino communities along these coasts—from the Cuban American neighborhoods of Miami to the Mexican American barrios of San Diego—the threat is personal. Many families have deep roots in these coastal areas, and the rising waters threaten homes, livelihoods, and cultural heritage. As one California swimmer's record journey shows, the ocean is both a source of pride and a force to be reckoned with.
The message from scientists is clear: the moon is no longer the sole driver of coastal flooding. Climate change, El Niño, and atmospheric pressure are amplifying the risks, and adaptation must be swift and inclusive. The coasts of Florida and California are on the front lines of a changing planet, and the time to act is now.
