Key takeaways Tropical North Atlantic The marine heatwave in the Gulf of Mexico and south of Cuba persists in extent but decreases in intensity, with moderate and locally strong categories observed. The marine heatwave east of Florida is decreasing in extent but increasing in intensity, with the emergence of strong and locally severe categories.  North… Read More

Tropical North Atlantic The marine heat wave in the Gulf of Mexico, around Cuba and Florida increases in intensity with strong and locally sever categories Tropical Pacific The marine heatwave presents in the South China Sea increases in intensity, with moderate to strong categories.  North Pacific The marine heat wave presents in the centre of… Read More

The map above shows average Sargassum abundance for the month of July 2025, with warm colors representing higher abundance. The top color (red) indicates that 0.4% of the ocean surface is covered by Sargassum, meaning that Sargassum clumps and mats are scattered here and there in the location. The Sargassum abundance for each region is… Read More

The marine heatwave bulletin provides forecasts and analysis of marine heatwave events across the globe and throughout the year. Used datasets include observations (satellite sea surface temperature maps) and numerical model analyses (assimilating satellite and in situ observations) to derive marine heatwave forecasts for a 10-day period. This week’s forecasts were produced using as a comparison the marine… Read More