Perhaps one of the most important weather forecasts ever made was the one for D-Day, the Allied invasion of France.
For the Allied invasion to have any chance of success, General Eisenhower – Supreme Commander of the Allied Forces - needed a full moon, a low tide, little cloud cover, light winds, and low seas. The low tide was necessary to allow soldiers to see, avoid, and disarm the mined obstacles. During June 1944 a full moon and low tide coincided on 5, 6 and 7 June. The invasion of France had been scheduled for June 5, 1944.