Federal meteorologists confirmed Thursday that El Niño conditions have intensified into a very strong event, with effects expected to persist through at least spring 2027. The National Oceanic and Atmospheric Administration’s Climate Prediction Center (CPC) reported a greater than 79% chance of a strong-to-very strong El Niño through January-March 2027, with weakening likely to begin early next year.
The agency also noted a 60% chance that this event could surpass all previous El Niños dating back to 1950 for the October-December and November-January periods. Sea surface temperature anomalies in the eastern equatorial Pacific Ocean have exceeded 4.0°C, extending farther westward than in prior months.
What is El Niño?
El Niño is a naturally recurring climate pattern characterized by warmer-than-average sea surface temperatures in a specific region of the Pacific Ocean near the equator. It occurs every two to seven years and typically lasts nine to 12 months. While not an official term, a “super” El Niño describes an especially intense event, though agencies like NOAA and the World Meteorological Organization do not use the phrase.
Global and U.S. Impacts
El Niño alters weather patterns worldwide, often leading to:
- Increased global temperatures, with researchers at the University of Chicago estimating 451,000 additional heat-related deaths globally this year compared to a typical year.
- Altered hurricane activity, including amplified storms in the Pacific and suppressed activity in the Atlantic.
- Regional weather shifts, such as wetter conditions in the southern U.S. and warmer, drier conditions in the northern U.S. during winter.
- Economic consequences for industries like fishing, agriculture, and utilities, which depend on predictable weather patterns.
The CPC emphasized that while a very strong El Niño increases the likelihood of these impacts, they are not guaranteed. The event’s strength is measured by sea surface temperature anomalies in the tropical Pacific, with current readings exceeding historical benchmarks.
Timeline and Forecast Strength
The CPC’s latest update indicates El Niño has continued to strengthen since its October assessment, when there was an 83% chance of a strong-to-very strong event through January-March 2027. The agency now projects a 54% chance that this El Niño will exceed the strength of all prior events from 1950 for the September-November period.
Forecasters warn that if current trends persist, 2027 could become the hottest year on record, with El Niño playing a significant role in global temperature anomalies. The event’s duration and intensity are being closely monitored, as its effects may extend into early 2028 before weakening begins.