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

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 ...

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

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

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

Quieter hurricane season ahead? In El Niño hurricane seasons, stronger shearing winds and sinking air often occur over at least the Caribbean Sea and some adjacent parts of the Atlantic Basin. This ...

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 ...

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

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.

The Climate Prediction Center said there's a 60% chance the climate phenomenon exits between February and April this year.

El Niño–Southern Oscillation (ENSO) is a coupled ocean–atmosphere phenomenon centered in the tropical Pacific, characterized by quasi-periodic fluctuations between warm (El Niño), cold (La Niña), and ...