If you've been following weather news, you've probably heard about El Niño. But what exactly is it, and why does something happening thousands of miles away in the Pacific Ocean matter to people in New Jersey?
In simple terms, El Niño is a natural climate pattern that occurs when surface waters in the tropical Pacific Ocean become unusually warm. That extra warmth releases heat and moisture into the atmosphere, which can alter weather patterns across much of the globe. One of the main ways it does this is by shifting the jet stream, the fast-moving river of air high in the atmosphere that helps steer storms across North America. Because the jet stream influences where storms develop and travel, El Niño can have noticeable effects on winter weather in the eastern United States, including New Jersey.
While no two El Niño events are exactly alike, the pattern often increases the chances of a more active storm track along parts of the East Coast during the cooler months. For a state like New Jersey, that matters. With more than 130 miles of Atlantic coastline, extensive bays and estuaries, and densely populated coastal communities, New Jersey is especially vulnerable to flooding.
Many residents - especially those away from the coast - think of flooding as something that happens only during hurricanes or major nor'easters, but increasingly, that's not the case. Even routine high tides can flood roads, neighborhoods, and businesses. As sea levels continue to rise, water needs less help from storms to reach places that once remained dry. A strong onshore wind, an unusually high tide, or a modest coastal storm can now produce impacts that would have been less likely decades ago.
El Niño itself is a natural phenomenon. However, it is occurring against the backdrop of a warming climate and rising sea levels. That means that El Niño may enhance the likelihood of stormy periods and persistent onshore winds, while higher sea levels mean that even minor coastal flooding events can become more disruptive. Communities along the Jersey Shore, as well as areas bordering tidal rivers and bays, are already experiencing more frequent nuisance flooding. When higher tides coincide with storms or strong winds, the impacts can be amplified.
Some of New Jersey's best flood protection already exists in nature in the form of wetlands, marshes, forests, and other undeveloped landscapes that help absorb and slow floodwaters. Wetlands act like giant natural sponges, temporarily storing water during heavy rainfall and coastal flooding before gradually releasing it back into the environment.
Protecting upland forests and open spaces is equally important. When land is covered by pavement, rooftops, and parking lots, rainfall cannot soak into the ground. Instead, it runs quickly into streams, rivers, and storm drains, increasing flood risks downstream. Investments in land conservation, wetland restoration, green infrastructure, and strategic flood-resilience programs can help communities adapt to both today's flood risks and tomorrow's changing climate.
So, what can New Jersey expect in the coming months? A seasonal forecast can't predict exactly what will happen on a particular day or month or whether any specific storm will strike New Jersey, but El Niño is expected to remain a significant influence through the winter months. That means greater potential for an active storm pattern during the cool season. There will also be an elevated risk of coastal flooding, particularly during periods of strong onshore winds and high tides. There will be increased vulnerability in low-lying coastal and tidal communities and the possibility that even moderate storms could produce outsized flooding impacts.
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