On this 75th Anniversary of D-Day, it is important to remember the role weather played.
The weather pattern that was set up in June 1944 was a stormy one. For the invasion to work for all of the different military branches, the weather needed to cooperate.
They needed a full moon so there was some light at night, and also for clouds not to cover it. Eisenhower chose June 5th for the date, but after talking to three teams of meteorologists, it was decided to push the invasion back a day.
At this time, there was no satellite or reliable radar data, and forecasts were not great a couple of days out. June 5th, the original date ended up being stormy. Thankfully the weather was decent enough on the 6th for it to be successful.