Super El Niño lifts Pacific sea levels up to 15 inches, threatening coastal communities
Scientists say the ongoing Super El Niño has pushed sea levels in parts of the eastern Pacific as high as 15 inches, putting many coastal towns at risk of severe flooding.
A massive warm-water bulge linked to the Super El Niño has elevated sea levels in the eastern Pacific by as much as 15 inches (40 cm), according to ocean scientists. The rise creates a heightened risk of coastal flooding and shoreline erosion along thousands of kilometres, from Alaska to Chile, with the most pronounced increases near the equator—up to 16 inches (40 cm) in the Galápagos and 13 inches (33 cm) in parts of Peru and Ecuador.
Researchers project that sea levels will peak around November or December as ocean temperatures hit their maximum, potentially boosting extreme sea-level events by a factor of ten. In California, the combination of unusually high tides, storm surges and elevated sea levels could produce the highest water marks ever recorded on the state’s coast. Satellite data also show sea-level drops of 6-8 inches (15-20 cm) around Indonesia and northern Australia, while the Pacific’s surface colour has shifted from green to blue due to disrupted nutrient flows. NOAA assigns an 83 percent chance that this will be the strongest El Niño since records began in 1950.
Why it matters
Rising seas threaten millions of coastal residents and could trigger unprecedented flooding across the Pacific rim.
How this story developed
- Aug 31 UN warns that a record-breaking El Niño could trigger worldwide extreme weather
- Sep 3 UN says the El Niño is expected to remain in place until February 2027.
- Sep 7 Britain announced cuts of more than 80 % to bilateral aid in eight African states.
- Sep 7 UK models show a higher likelihood of stormier, wetter conditions during autumn and winter.
- Sep 9 The contiguous United States experienced its warmest June-August period on record, with an average temperature of 74.4°F, according to NOAA.
- Sep 10 August 2026 set a new all‑time monthly heat record and drought drove the two biggest western water reservoirs to their lowest historic levels.
- Sep 21 The system, now classified as a hurricane, is positioned about 270 miles south-southeast of Manzanillo and 190 miles south-southwest of Zihuatanejo, with sustained winds of 80 mph. Forecasts suggest it could reach major-hurricane strength by Tuesday and maintain a trajectory offshore while dumping 4-8 inches of rain across Guerrero and Michoacan through Thursday. Tourist hubs such as Acapulco, Puerto Vallarta and Guadalajara may experience rough seas and gusty conditions, and the moisture could trigger flash-flood threats in the U.S. Southwest later in the week.
- Sep 23 Polo intensified to Category 5 with maximum sustained winds of 175 mph.
- Sep 24 Authorities opened shelters and deployed thousands of military and Red Cross personnel to assist affected communities.
- Sep 29 Probability estimates now place a greater than 90% chance that the El Niño will remain very strong through February 2027.
- Oct 2 Manila Water Philippine Ventures is stepping up its water-supply safeguards after PAGASA projected a very strong El Niño that could last until the first quarter of 2027.
- Oct 7 The Department of Agriculture in Bicol rolled out a major aid package for farmers and fishers ahead of the El Niño.
In this story
Related stories
46 in this thread