A record-breaking, astonishingly expansive marine heatwave is underway in the Pacific Ocean, stretching about 5,000 miles from the U.S. west coast to waters around Japan which contributed to its hottest summer on record, 107.2 degrees Fahrenheit. The sea temperature difference from average across the North Pacific smashed August’s all-time record. There’ve been multiple die-offs of marine mammals, seabirds and forage fish in Alaskan waters.
https://www.cnn.com/2025/09/19/climate/pacific-ocean-blob-hot-water-global-warming