A potentially powerful El Niño event is expected to emerge over the coming months, with climate scientists warning of significant disruption to weather patterns across the United States. Forecasters say there is even a possibility of a so-called “super” El Niño developing, which could amplify already serious concerns.
TheNational Oceanic and Atmospheric Administration’s Climate Prediction Center has said conditions are likely to emerge during the May to July period, with confidence among forecasters continuing to grow. The World Meteorological Organisation has confirmed that last year ranked among the three warmest on record, part of what it described as a “streak of extraordinary global temperatures”, with the last 11 years all ranking as the warmest ever recorded. A strong El Niño, scientists caution, could push global temperatures even higher into 2027.
How El Niño Reshapes the Climate
El Niño and La Niña represent the warm and cool stages respectively of the El Niño–Southern Oscillation, a natural climate cycle in the tropical Pacific that swings irregularly every two to seven years. During an El Niño event, trade winds that ordinarily blow westward along the equator weaken, pushing warm water eastward towards the West Coast of the Americas. This causes the Pacific jet stream to shift south of its usual position, producing warmer and drier conditions across parts of the northern United States and Canada, while bringing wetter weather to the Gulf Coast and south-east.
AccuWeather has forecast that this year could prove “an unusually active and potentially impactful year in the Pacific basin,” predicting an above-average number of named storms, hurricanes and major hurricanes across both the Eastern and Central Pacific. Matthew Rosencrans, NOAA’s lead seasonal hurricane forecaster, told Newsweek that El Niño is associated with greater tropical storm and hurricane activity in the eastern and central Pacific, whilst simultaneously being linked to fewer storms forming in the western Atlantic Basin.
Drought, Wildfire and Flood Concerns
Beyond the hurricane season, El Niño is expected to produce a hotter and drier summer pattern across the north-western United States, conditions that AccuWeather meteorologist Chad Merrill warns can lead to large wildfires. Merrill noted that severe drought could expand across more of the north-west into the northern Rockies should a strong to very strong El Niño develop by autumn and early winter. Large parts of the north-west are already experiencing drought conditions, with the most severe areas concentrated in south-western Idaho, adjacent parts of Nevada, and portions of Utah and Colorado, according to the US Drought Monitor.
Meanwhile, Merrill cautioned that the mid-Atlantic and south-east face prolonged dry spells along the Interstate 81 corridor, interspersed with heavy rainfall arriving in short bursts? a pattern he says offers little benefit to agricultural communities due to poorsoil absorption. The Plains and Midwest are also at risk, with repeated rounds of heavy rain potentially causing flooding from northern Texas through to western Pennsylvania.
A heightened Eastern Pacific hurricane season, combined with unusually warm waters off the West Coast, could further produce tropical downpours affecting southern California and the south-west from mid-summer into early autumn. There may, however, be some relief. Experts have previously indicated that El Niño could deliver beneficial rainfall to the long-suffering Colorado River system, which has endured years of persistent drought.
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