'Pressure' Film Reveals Human Side Of Weather Forecasts

For most people, weather is small talk, maybe a quick check on your phone before heading out the door. But for the characters at the center of the new film "Pressure," weather was life or death.

The film tells the remarkable, true story of the meteorologists tasked with forecasting conditions ahead of D-Day, one of the most important military operations in history. 

And according to actor Andrew Scott, who portrays Group Captain James Stagg, the narrative immediately grabbed him.

“It blew my mind that the story even existed,” Scott said.

“I just couldn't get it out of my head," echoed the film's director Anthony Maras. "It was unlike many things that I'd ever read.”

Set in the tense days before the Allied invasion of Normandy in June 1944, "Pressure" focuses on the enormous responsibility carried by meteorologists trying to predict a safe window for crossing the English Channel.

The concerns weren’t minor. High winds threatened to scatter paratroopers off course. Rough surf could swamp landing craft. Thick cloud cover would have prevented pilots from seeing targets and supporting troops on the beaches.

(MORE: The Tools Behind The 1944 D-Day Forecast) *link will be live Monday*

And unlike today, forecasters in the 1940s had no satellites, no sophisticated radar networks and no computer models crunching data in real-time.

“Going through the old methods like before the computers, before the digital algorithms,” Maras said. "To just see the old tech where it was dials and levers and leather and metal.”

Meteorologists back then relied on weather balloons, ship observations, hand-drawn maps and scattered reports from across the Atlantic.

“They had to interpret the weather as much as analyze it, and there was a lot of subjectivity and instinct as well as hard data,” Maras explained. “We had a lot of meteorological advisors. Just to see the speed of their brains and how they looked at things was fascinating to me.”

(MORE: Behind-The-Scenes Of ‘Pressure’) *link will be live Wednesday*

The story centers around the real-life James Stagg (played by Scott), the Scottish meteorologist who advised Allied commander Dwight D. Eisenhower (played by Academy Award-winner Brendan Fraser) on the timing of the invasion as dangerous storms moved across the Channel.

“There was a gap in the weather where he believed instinctively it might be a good time where it might surprise the enemy,” Scott said.

That temporary break became the famous “weather window” that allowed the invasion to move forward on June 6, 1944.

“Eisenhower decided, if we are going to go, we will go then. Because the enemy will not see it coming," Fraser said.

But the film doesn’t portray forecasting as magic or certainty. In fact, one of the themes that resonated most with the cast was the humility required to predict something as chaotic as the atmosphere.

“What they're saying in the movie so often is we need a 100% guarantee what's it going to be, what's it going to be? And he (Stagg) refuses, and correctly so,” Scott said.

(MORE: Honoring The Meteorologists Who Forecasted D-Day) *link will be live Thursday and will publish simultaneously with this article*

Forecasting has improved dramatically since World War II, but weather remains a challenge. That human element became one of the film’s most fascinating aspects for the cast and crew.

“We need to look at the people who are interpreting the weather as much as we do the weather itself,” Scott said.

Maras said working with meteorological advisors gave him a completely new appreciation for the science and artistry behind forecasting.

“Regular people don't realize how bloody hard it is to get the weather reading even now,” Maras said.

Fraser believes the story carries an important reminder about having reverence for nature and the people trying to understand it.

“Have some respect for the science of meteorology," he said. "Intuition and expectation and hopes and dreams and all that go into a factory making a prediction about the weather which has the outcomes of our very lives at stake on top of it."

And perhaps that’s why the film's release feels so timely. Beyond the war story and historical drama is a deeper reminder that weather shapes nearly every aspect of human life, whether we notice it or not.

“(Weather) can kind of be a mirror for our own lives. We have stormy days, we have sunny days, we have highs, we have lows," said Maras. “There's a beauty in it."

weather.com lead editor Jenn Jordan explores how weather and climate weave through our daily lives, shape our routines and leave lasting impacts on our communities.