Marine heatwave Bulletin Forecasts for December 6, 2025
Key takeaways Marine heatwave categories Tropical Atlantic The marine heatwave affecting the basin is decreasing in extent while remaining in the moderate and strong categories. The marine heatwave west of Liberia is decreasing in extent, and only one scattered area remains in the moderate and strong categories. Weekly temperature anomalies Tropical Atlantic 0°C to 2°C… Read More
Marine heatwave Bulletin Forecasts for November 29, 2025 by Mercator International
Key takeaways Tropical Atlantic The extent and the intensity of the marine heatwave impacting the basin are stable in moderate to strong categories, except for marine heatwave along the African coast around 15°N which is diminishing in both intensity and area, and is now in moderate category. Weekly temperature anomalies Tropical Atlantic 0°C to 2°C South… Read More
Marine heatwave Bulletin Forecasts for November 22, 2025 by Mercator International
Key takeaways Tropical Atlantic The extent of the marine heatwave in the Gulf of Mexico and the Caribbean Sea is decreasing, but its intensity remains moderate overall. The extent of the marine heatwave in the center of the basin is decreasing, but its intensity remains stable overall. The marine heatwave along the African coast around… Read More
Experimental Weekly Sargassum Inundation Risk (SIR v1.3) By the National Oceanic and Atmospheric Administration (NOAA), and the University of South Florida (USF) Status: Nov 11-17, 2025
Marine Heatwave Bulletin Forecasts for November 15, 2025 by Mercator International
Key takeaways Tropical Atlantic The extent and intensity of the marine heatwave in the Gulf of Mexico and the Caribbean Sea are decreasing. Only a few scattered areas remain under the moderate category. The marine heatwave around 30°W is decreasing in extent, falling into the moderate category, and locally into the strong category. The marine… Read More
Experimental Weekly Sargassum Inundation Risk (SIR v1.3) By the National Oceanic and Atmospheric Administration (NOAA), and the University of South Florida (USF) Status: Nov 4-10, 2025
Marine Heatwave Bulletin Forecasts for November 8, 2025 by Mercator International
Key takeaways Tropical Atlantic The extent and intensity of the marine heatwave in the Gulf of Mexico and in the Caribbean Sea decreasing with moderate category. The marine heatwave around 30°W is decreasing in area and intensity, shifting overall to a moderate category. The marine heatwave off the African coast around 8°N is increasing with… Read More
Experimental Weekly Sargassum Inundation Risk (SIR v1.3) By the National Oceanic and Atmospheric Administration (NOAA), and the University of South Florida (USF) Status: Oct 28-Nov 3, 2025
Outlook of 2025 Sargassum blooms- October 31, 2025
A perspective for the Caribbean Sea and Gulf of America* by the University of South Florida Optical Oceanography Lab The map above shows the average Sargassum abundance for the month of October 2025, with warm colors representing higher abundance. The top color (red) indicates that 0.4% of the ocean surface is covered by Sargassum, meaning… Read More
