Image caption
Animation of maps of sea surface temperatures in the Pacific Ocean compared to the long-term average over five-day periods from the end of May to early August 2023. The waters in the key monitoring region, which scientists call "the Niño-3.4 region," progressively become warmer than average (red) as El Niño builds. NOAA Climate.gov, based on Coral Reef Watch maps available from NOAA View.