Alex Bailey/Focus Features/StudioCanal Editor’s Note: This story contains spoilers for the movie Pressure . The Allied Forces stormed the beaches of Normandy, France, on June 4, 1944, turning the tide of World War II in what we now know as D-Day . A new biopic highlights how the soldiers battled not only enemy gunfire, but the unpredictability of Mother Nature. Pressure recreates the critical landing operation in Nazi-occupied France and the less-heralded, but equally important, events preceding it. In theaters Friday, May 29, the movie stars Academy Award winner Brendan Fraser as General Dwight D. Eisenhower and Andrew Scott as Group Captain James Stagg, the meteorologist who consulted on the attack. Because D-Day—also known as Operation Overlord— required very specific environmental conditions , such as a full moon (aiding visibility for air operations) and low tides (exposing any mined obstacles for ground troops), Allied troops had a very limited three-day window to launch the invasion.…