Computational study reveals machine-learning ensemble weather models misplace storm tracks before D-Day, suggesting potential risks of overconfidence in extreme weather predictions.
The new film ‘Pressure’ brings renewed attention to one of the most dramatic weather forecasts ever. In June 1944, James Stagg faced the unenviable task of advising whether conditions would allow the D‐Day landings to proceed, with the lives of 160 000 troops and the fate of the war in the balance. Using AIFS‐ENS, the ECMWF machine‐learning ensemble forecast system, we recreate the forecasts in the days before 6th June. Even at short range, AIFS‐ENS moves the storm too rapidly into the Norwegian Sea giving undue confidence for favourable conditions for the landing in Normandy.
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Charlton‐Perez et al. (2026) studied this question.
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