What happened in this episode?
Neil deGrasse Tyson and Chuck Nice host Columbia University climate scientist Adam Sobel for a short explainer on El Niño and its links to extreme weather. Sobel describes El Niño as a naturally occurring ocean–atmosphere phenomenon centred in the eastern equatorial Pacific, where reduced upwelling warms sea-surface temperatures and shifts tropical rainfall eastward, altering global atmospheric circulation via teleconnections.
Sobel outlines how scientists track El Niño strength using sea-surface temperature anomalies in defined regions such as Niño 3.4, adding that some approaches compare the region to the broader tropics to help separate the signal from background warming. He says the current event is unusually strong, and notes forecasts suggesting it could be the largest in the modern observational record.
On impacts, Sobel stresses El Niño shifts seasonal odds rather than day-to-day weather, and he lists typical patterns including wetter conditions across parts of the southern United States, drier conditions in the Pacific Northwest, and suppressed Atlantic hurricane activity due to changes in jet-stream position and wind shear.
Asked about climate change, Sobel says warming likely influences El Niño but argues the direction and magnitude remain uncertain in the research literature, noting disagreement among models and limited statistics because major events are infrequent. He also discusses the track record of climate modelling at global scales, saying broad projections from earlier decades have been close to observed warming, while uncertainties grow for local extremes and event-specific attribution.
