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 heatwave situation on 08/04/2025.

Tropical Atlantic Ocean

The marine heatwave in the Gulf of Mexico and the Caribbean Sea is decreasing in extent, and only a few scattered areas remain in moderate category. Towards the equator and off the coast of Africa, the moderate to locally strong marine heatwave is intensifying and is now predominantly strong.  Off the coast of Brazil, the marine heatwave of moderate category is diminishing in extent, and only a few scattered areas remain. 

Mean sea surface temperature anomalies in each global ocean region for the week 13 to 19 April, 2025.

Mediterranean Sea	0°C to 2°C
Tropical Pacific Ocean	-1°C to 3°C
North Atlantic Ocean	-3°C à 3°C
Tropical Atlantic Ocean	-1°C to 2°C
Indian Ocean	0°C to 3°C

Access the Daily Global Physical Bulletin for a 9-day forecast here.