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. [1]This week’s forecasts were produced using as a comparison the marine heatwave situation on 04/03/2025.

Tropical Atlantic Ocean

The marine heatwave in the Caribbean Sea is intensifying, with most of it in the strong category, and some in the severe category. The marine heatwave to the west of the Gulf of Guinea is intensifying, with an increase in the area covered by strong categories.

Mean sea surface temperature anomalies in each global ocean region for the week 9 to 15 March, 2025.

Indian Ocean	0°C to 1.5°C
Tropical Atlantic Ocean	0°C to 2°C
South Atlantic Ocean	0°C à 3°C
Tropical Pacific Ocean	-1.5°C to 2.5°C
South Pacific Ocean	-0.5°C to 3°C
South Atlantic Ocean	0°C à 3°C

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