El Niño has officially formed. On 11 June 2026, the National Oceanic and Atmospheric Administration (NOAA) upgraded its outlook from an El Niño Watch to an El Niño Advisory and now puts the odds of a “very strong” event at 63 percent, up sharply from the roughly 1-in-4 chance flagged in our last bulletin.

A strong El Nino event is now highly likely to develop in the tropical Pacific between June and September 2026, and to persist through the Northern Hemisphere winter of 2026 to 2027. There is a real, though not certain, possibility that this event will reach “super” El Nino intensity, a category previously seen only in 1982 to 1983, 1997 to 1998, and 2015 to 2016.