Marine heatwave Bulletin Forecasts for November 1, 2025 by Mercator International
Key Takeaways Tropical Atlantic The extent and intensity of the marine heatwave in the Gulf of Mexico are decreasing, shifting from strong and moderate categories to mostly moderate. In the Caribbean Sea, the strong and moderate marine heatwave has almost completely disappeared. The marine heatwave around 30°W is decreasing in area and intensity, shifting overall… Read More
National HAB Observing Network Enhances Coastal Bloom Monitoring
The National Harmful Algal Bloom Observing Network (NHABON) is advancing efforts to improve how the U.S. observes and responds to Harmful Algal Blooms (HABs). By connecting regional networks, researchers, and observing systems such as CARICOOS, NHABON strengthens national coordination and data sharing to better protect marine life, public health, and coastal economies. Through continuous monitoring… Read More
Marine heatwave Bulletin Forecasts for October 25, 2025 by Mercator International
Key takeaways Tropical Atlantic The marine heatwave in the Gulf of Mexico and the Caribbean Sea is decreasing in intensity and is now mostly in the moderate category. The marine heatwave around 30°W is increasing in extent but remains moderate overall.
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 14-20
Marine heatwave Bulletin Forecasts for October 18, 2025 by Mercator International
Key Takeaways Mediterranean Sea -1°C à 2°C Tropical Atlantic -1°C à 1.5°C North Pacific – 3°C < 3°C Tropical Pacific -2°C à 2.5°C India Ocean -1°C à 1.5°C
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 7-13, 2025
Experimental Weekly Sargassum Inundation Risk (SIR v1.3) By the National Oceanic and Atmospheric Administration (NOAA), and the University of South Florida (USF) Status: Sep 30-Oct 6, 2025
Marine heatwave Bulletin Forecasts for October 11, 2025 by Mercator International
Key takeaways North Tropical Atlantic The marine heatwave in the Gulf of Mexico and in the Caribbean Sea remains stable with strong category. The marine heatwave extent around 30°W and near the equator decreases, only a few scattered areas remain. Mediterranean Sea -1°C à 2°C Tropical Atlantic -1°C à 1.5°C North Pacific -1°C à 2.5°C … Read More
Outlook of 2025 Sargassum blooms- September 30, 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 September 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
