King Tides Inundate Both U.S. Coasts: Flooding and Erosion Threaten Communities
King tides—exceptionally high tides that occur when the moon is at perigee (its closest point to Earth) and aligns with the sun—are currently bringing flooding and erosion to coastal communities on both the East and West Coasts of the United States. These tides, also known as perigean spring tides, can be significantly higher than normal high tides, according to NOAA. When perigee coincides with a full or new moon, the gravitational effects of the moon and sun reinforce each other, producing tides that can inundate low-lying areas. Streets that are dry for most of the year can suddenly resemble shallow canals, with water bubbling up through storm drains and pooling across roads, sidewalks, and parking lots. The situation is exacerbated if a storm strikes during a perigean spring tide, as the flooding can be significantly worse than it would be otherwise.
On the East Coast, Central Florida’s coastal counties are experiencing flooding and beach erosion due to a combination of king tides and strong winds. In Brevard County’s Satellite Beach, beach crossovers are closed through Sunday, and rough surf has carved out steep cliffs and created dangerous drop-offs near the stairs. The flooding has raised new concerns about beach erosion, which can weaken coastal infrastructure and habitats. Local officials are urging residents to avoid flooded areas and to stay informed about changing conditions.
On the West Coast, coastal flooding warnings and advisories remain in effect across much of Southern California as officials brace for more high tides and possible weekend rain. The National Weather Service offices in Los Angeles and San Diego have warned that water levels could remain well above normal, increasing the risk of flooded roads, beach erosion, and seawater inundation in low-lying coastal communities. Orange and San Diego counties remain the greatest concern, where officials warn that homes, businesses, and infrastructure near the shoreline could flood during high-tide periods. Advisories also remain in effect along portions of the coastlines of Los Angeles, Ventura, Santa Barbara, and San Luis Obispo counties.
As king tides become more frequent and intense with sea level rise, coastal communities face growing challenges in adapting to these recurring events. The combination of high tides, storm surge, and heavy rain can overwhelm drainage systems
Shimanta Das 
