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

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