2026 El Niño: What It Could Mean for Precipitation and Its Impact on Critical Infrastructure
The National Weather Service declared the development of an El Niño on June 11, 2026, after sea surface temperatures in the central and eastern tropical Pacific reached approximately 0.5°C above average. Current conditions are also showing unusually warm water developing in the eastern Pacific near the coast of Peru. While the event is still developing, there is a possibility that it could strengthen into what is commonly referred to as a “Super El Niño,” characterized by Oceanic Niño Index values of at least +2°C.
El Niño occurs when unusually warm water develops across the tropical Pacific, shifting tropical thunderstorm activity eastward and adding additional heat and moisture to the atmosphere. These changes can influence upper-level wind patterns and, in turn, alter precipitation and temperature patterns across North America. However, El Niño impacts are probabilistic rather than deterministic; a strong El Niño does not guarantee a specific weather event in a particular location.
For the United States, El Niño generally increases the likelihood of above-average precipitation across the southern half of the contiguous U.S., with some of the most noticeable effects occurring in the Southwest. It can also increase the potential for atmospheric river events and influence hurricane activity, including a generally reduced Atlantic hurricane threat. The 2023–24 Super El Niño demonstrated that these relationships are not absolute, as the Atlantic hurricane season remained exceptionally active.
The most pronounced impacts of the 2026 El Niño are expected during the winter, although effects can begin developing earlier. The event is expected to last approximately one year, and interactions with other atmospheric and oceanic patterns could produce additional effects during the fall.
Preparing for the Season Ahead
As the El Niño pattern develops, critical infrastructure owners should anticipate the potential for more precipitation events than average and ensure that monitoring and response procedures are ready. Recommended preparations include reviewing Emergency Action Plans (EAPs) and Plans of Action (PoAs) and ensuring personnel have appropriate training to interpret and respond to alerts.
While El Niño cannot predict individual storms or flooding events, understanding the broader climate pattern provides valuable context for anticipating periods of increased precipitation and preparing infrastructure managers for potentially wetter conditions.
Prepared by Cole Rademacher, Staff Meteorologist, USES Corp.
Photo credit : NOAA
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