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Marine Heatwave Bulletin Forecasts for September 26, 2026 – Reposted from Mercator Ocean International

Marine heatwave categories North Atlantic The marine heatwave extending from the English Channel to the Bay of Biscay is intensifying and is now mostly in the “strong” category, with “severe” and “extreme” conditions in some areas. The marine heatwave off the coasts of Portugal and Morocco is intensifying, with “strong” conditions covering a larger area…. Read More

Map of marine heatwave categories for the 26 September 2026 forecast across the global ocean. GLO12 forecast. Source: Mercator Ocean International

Experimental Sargassum Inundation Risk (SIR v1.3) By the National Oceanic and Atmospheric Administration (NOAA), and the University of South Florida (USF) Status: September 20, 2026

Marine Heatwave Bulletin Forecasts for September 19, 2026 – Reposted from Mercator Ocean International

GLOBAL OCEAN North Atlantic From the Azores to the coasts of Florida and the Caribbean, the marine heatwave remains stable in area but is increasing in intensity, with numerous areas in the strong category. The marine heatwave off the coast of Guinea is increasing in intensity toward the west, with strong and severe categories, and… Read More

Experimental Sargassum Inundation Risk (SIR v1.3) By the National Oceanic and Atmospheric Administration (NOAA), and the University of South Florida (USF) Status: September 15, 2026

Experimental Sargassum Inundation Risk (SIR v1.3) By the National Oceanic and Atmospheric Administration (NOAA), and the University of South Florida (USF) Status: September 8, 2026

Outlook of Sargassum Blooms – August 31, 2026

A perspective for the Caribbean Sea and Gulf of America by University of South Florida Optical Oceanography Lab (bbarnes4@usf.edu, yuyuan@usf.edu, huc@usf.edu) The map above shows the average Sargassum abundance for the month of August 2026, with warm colors representing higher abundance. The top color (red) indicates that 0.4% of the ocean surface is covered by… Read More