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Meteorologists have increased the likelihood of an El Niño event developing in the coming months to 82%, with a 37% chance that it will reach “very strong” intensity. This forecast is drawing particular concern in Southern California, where residents recall the devastating 1997-98 El Niño season that caused hundreds of millions of dollars in damage and claimed 17 lives.
If these federal predictions hold true, this would mark only the fourth “very strong” El Niño in the past 50 years. Typically, El Niño brings heavy rainfall to California’s usually dry landscape, with strong events capable of shifting the subtropical jet stream-normally responsible for precipitation in Central America-toward the state.
El Niño is a natural, cyclical warming of the equatorial Pacific Ocean that significantly influences global weather patterns. Its opposite, La Niña, is characterized by cooler-than-average Pacific waters.
Jeff Berardelli, Chief Meteorologist and Climate Specialist at WFLA-TV, explained that El Niño effectively redistributes heat across the planet. Currently, warm water beneath the ocean’s surface is moving eastward and rising to the surface-an early sign of El Niño’s development.
Recent data from the World Meteorological Organization (WMO) shows rapidly increasing sea-surface temperatures, with strong confidence in El Niño’s onset and further strengthening in the months ahead, according to Wilfran Moufouma Okia, head of climate prediction at the WMO.
El Niño typically emerges every two to seven years and lasts between nine and twelve months. California Institute for Water Resources climate scientist Daniel Swain noted that current subsurface warm water anomalies are among the largest recorded, suggesting the potential for a particularly intense event. The most powerful El Niños are classified as “super El Niños.”
“One of the key building blocks to make it fully materialize is, in fact, occurring,” Swain said. “We still don’t know exactly what’s going to happen.
It’s not guaranteed it’ll be a super El Niño. But the potential is there for something genuinely remarkable.”
If the Pacific Ocean releases substantial heat, it can amplify weather extremes worldwide. Berardelli pointed out that this can mean more intense heatwaves, worsened drought in some regions, and increased moisture that leads to heavier flooding.
El Niño also tends to suppress the Atlantic hurricane season, as the Pacific’s heat dominates. This could result in a drier summer and fewer tropical storms in the Caribbean.
Historical events underscore the risks: The early 1998 El Niño triggered widespread flooding and mudslides in California, causing over $500 million in damage and delivering more rain to parts of Los Angeles in one month than usual for an entire year. Similarly, the strong 1982-83 El Niño saw coastal storms destroy dozens of homes and damage thousands more, alongside significant impacts on local businesses.
While El Niño does not always lead to disaster, its occurrence alongside the ongoing marine heat wave off the West Coast could have serious consequences for regional wildlife, according to the National Oceanic and Atmospheric Administration. As the situation develops, officials and residents alike are preparing for the potential impacts of this powerful climate phenomenon.