D-Day Anniversary: How The Weather Forecast Changed The Tide Of War

The 79th Anniversary of D-Day commemorations in Ver-sur-Mer, France, on June 06, 2023. The historic Normandy landings on June 6, 1944, marked the largest seaborne invasion ever, launching the Allied liberation of France and shaping the Western Front towards an eventual victory in World War II. ARTUR WIDAK/ACCUWEATHER

One of the most important weather forecasts in world history would occur in early June 1944, as Allied meteorologists prepared to deliver the final word for the long-awaited D-Day invasion of Normandy.

Thousands of lives and the tide of the war depended entirely on teams of Allied meteorologists who determined what constituted suitable weather conditions for the invasion in a short time window.