US Braces for Unprecedented ‘Super’ El Niño Winter as Climate Thresholds Are Broached

The ongoing El Niño phenomenon is breaching critical thresholds, pushing Earth into unprecedented climate territory. Officially beginning on June 11, this climate pattern is injecting additional heat into an already warming world, threatening disruptive weather globally and potentially triggering humanitarian crises in vulnerable regions. Scientists note that while El Niño is a natural multiyear cycle, it has been intensifying at an unprecedented rate due to human-driven climate change, placing immense strain on fragile natural systems.

In a recent update, the National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Center projected a 75% probability that this event will surpass the strength of any El Niño recorded since 1950, the earliest year for which NOAA has comparative data. The event is also on track to become a “super” El Niño, a classification long anticipated by meteorologists.

Weekly data from NOAA indicates that sea surface temperatures in the eastern Pacific El Niño region have risen by 3.8 degrees Fahrenheit (2.1 degrees Celsius) above average, exceeding the 3.6 F (2 C) benchmark for a very strong event. Although NOAA typically relies on three-month averages to account for temporary weekly anomalies, the latest readings suggest a greater than 90% likelihood of a very strong event solidifying during the fall and winter.

The implications for the United States are significant. During El Niño phases, warmer waters accumulate east of the equatorial Pacific, steering the jet stream southward. This shift typically brings stormy winter conditions and increased rain and snow to California and southern states, while northern regions tend to experience milder winters with fewer storms. Additionally, NOAA warns of heightened risks for high-tide flooding, particularly along the West Coast. However, the severity of these impacts varies by region, and a stronger El Niño increases the certainty of expected outcomes without guaranteeing them.

The last “super” El Niño occurred during the 2015-2016 period, which was linked to a historic hurricane season in the central North Pacific and severe droughts in the Caribbean. Prior to that, the 1997-1998 super El Niño produced extreme weather across the US, including flooding in the Southeast, an ice storm in the Northeast, and tornadoes in Florida.

Domestic effects are already becoming visible. CNN reported that tropical storms in Hawaii this year have been attributed to El Niño, coinciding with warming waters in areas where such storms typically form. Meanwhile, the Pacific’s intensification has corresponded with unusual calmness in the Atlantic. According to Ars Technica, the Atlantic hurricane season passed its traditional peak without producing a single tropical storm or hurricane, marking a historic period of quiet.

NOAA defines El Niño conditions using a diagnostic flowchart, requiring sea surface temperatures in the eastern tropical Pacific to be at least 0.9 F (0.5 C) warmer than average, alongside consistent wind, pressure, and rainfall patterns. Events exceeding 3.6 F (2 C) above average are colloquially termed “super,” though this is not a formal scientific classification. Models from the European Centre for Medium-Range Weather Forecasts suggest temperatures may exceed 6.3 F (3.5 C) by year’s end, with daily readings reaching 5.5 F (3.06 C) as of September 20, according to The Climate Brink.

On September 3, the World Meteorological Organization (WMO) issued fresh warnings alongside a Global Seasonal Climate Update. “For September-November 2026, WMO multi-model forecasts indicate an increased likelihood of above-normal temperatures across almost all land areas, alongside rainfall patterns showing a pronounced and classic atmospheric response to the strong Pacific El Niño,” the WMO stated.

While much of the world faces higher temperatures, the most severe consequences are expected outside North America. Liz Stephens, a professor of climate risks and resilience at the University of Reading, highlighted that the Indian monsoon has seen below-normal rainfall, while satellite data shows record-dry conditions in parts of East Africa, Central America, and Southeast Asia. “During the large El Niño event of 1997/1998 the associated flooding in Somalia killed over 2000 people,” Stephens noted. “With a bigger El Niño event on the way, and global temperatures now 0.7°C [1.26 F] higher and capable of holding even more moisture as a result of climate change, scientists are concerned that there is potential for even more severe flooding.”