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 01/04/2025.

North Atlantic Ocean

The marine heatwave off the coast of Europe, between southern Ireland and northern Portugal, is intensifying, with an increase in the area covered by strong and severe categories, and the local appearance of extreme categories. To the west of Ireland and north of the British Isles, the marine heatwave remains in the moderate category. Off the coast of Morocco, a moderate to severe marine heatwave is developing. 

Mean sea surface temperature anomalies in each global ocean region for the week 6 to 12 April, 2025.

Mediterranean Sea	0°C to 1.5°C
Tropical Pacific Ocean	-1°C to 3°C
North Atlantic Ocean	-3°C à 3°C
Tropical Atlantic Ocean	-2°C to 2°C
Indian Ocean	0°C to 3°C

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