A major oceanic transition is underway as warming waters in the Pacific signal a transformative shift for global weather.

A study has identified a key change that has amplified the impact of El Niño on Arctic sea ice. The effect has been observed ...

The tools scientists have relied on for decades to track El Niño and La Niña are breaking down, and the reason is ...

The El Niño Southern Oscillation (ENSO) is a natural pattern of ocean and atmospheric changes in the tropical Pacific Ocean that can influence the weather pattern ...

NORFOLK, Va. — With the 2025 Atlantic hurricane season on the horizon, meteorologist are focusing on the El Niño–Southern Oscillation (ENSO), a key driver of seasonal storm behavior. Current ...

NOAA is to start using a new index, known as 'RONI,' to classify El Niño and La Niña events.

Two major weather agencies think it's increasingly likely that El Niño will form in the eastern tropical Pacific Ocean later ...

The El Niño-Southern Oscillation (ENSO), the most prominent interannual climate variability signal, has been widely studied for its teleconnections with Antarctic sea ice variability. However, its ...

El Nino could develop later this year, increasing the risk of record-breaking global heat, according to forecasts from several major weather agencies.

While La Niña is currently holding its own, the expectation is that an El Niño will develop by the peak of hurricane season. Here's why that's a big deal.