War drama Pressure depicts D‑day's weather forecast—what we found when we recreated the challenge using modern systems

On June 6th 1944 the largest armada ever assembled was hovering off the coast of Normandy waiting for just the right break in the weather to invade Nazi occupied Europe and change the course of the Second World War.

Meteorologist James Stagg gave what many regard as the most important weather forecast in history in June 1944. The fate of more than 150,000 Allied troops preparing to invade the Normandy beaches on D-Day and the future of the war in Europe depended on Stagg and his forecasting…