The movie 'Pressure' leans into the drama of high-stakes weather forecasts

Typically, meteorologists do not occupy leading roles in major Hollywood productions, but Pressure defies that trend.

The film Pressure presents a lightly fictionalized account of the critical events leading up to the D-Day invasion of France by Allied forces during World War II, highlighting the pivotal role played by meteorologists in determining the timing of the operation. This notable film features prominent actors, including Andrew Scott, who is recognized for his recent work in Ripley, portraying James Stagg, a Scottish meteorologist responsible for providing a weather forecast for General Dwight D. Eisenhower, who is portrayed by Oscar-winner Brendan Fraser.

Stagg faces immense stress in his role. The film's title references both barometric pressure and the substantial responsibility felt by D-Day planners, as numerous soldiers' lives were on the line during the assault on the beaches of Normandy. Allied commanders were acutely aware that a failure in the invasion could grant the Germans a considerable advantage.

According to James Taylor, principal curator at the Imperial War Museums in the UK, "They had an absolutely key role to play in the planning of D-Day," emphasizing the critical nature of meteorologists' forecasts.

However, the film’s primary drama stems not from interpersonal conflicts among the stressed meteorologists, but rather from the intricate science of weather forecasting. The narrative illustrates how an outdated forecasting method, which was prevalent in the United States prior to World War II, was supplanted by more advanced techniques that were emerging in Europe.

"It's really a seminal moment for the entire meteorological community," states Louis Uccellini, former head of the National Weather Service. "And that was brought forward for societal benefit post-World War II."

WWII Weather Tip #1: The future doesn't necessarily look like the past

Prior to World War II, weather forecasting in the United States predominantly relied on a straightforward principle: past weather patterns are indicative of future conditions. Essentially, this method entailed looking to historical data to forecast future weather events.

In Pressure, this approach is exemplified by the meteorologist Irving Krick, who led U.S. weather forecasting efforts for the Allies. As the D-Day invasion approached, "Krick was doing trend analysis," explains Frank Blazich, a military historian at the Smithsonian's National Museum of American History.

The D-Day invasion was initially scheduled for the early morning of June 5th, 1944. "Eisenhower needed a really strong weather forecast," Blazich reiterates. Optimal conditions were necessary for nighttime aircraft landings, which required clear weather and a full moon, along with unobstructed skies for ships targeting shore positions.

Krick relied on historical weather patterns from that date to predict conditions for 1944, confidently asserting, "Mark my words, D-Day will be calm and sunny."

Contrary to Krick’s assertions, other meteorologists provided forecasts informed by real-time atmospheric measurements from Newfoundland to Ireland, rather than historical data. These observations indicated a storm approaching England and France.

Ultimately, the European forecasts proved to be accurate, necessitating a postponement of the D-Day invasion to June 6.

Following World War II, the new weather forecasting methods gained traction in the U.S., as noted by Uccellini, resulting in more timely and precise weather forecasts, particularly for severe events like hurricanes and other significant storms.

"This established a foundation for what we subsequently observed throughout the rest of the century, enabling predictions two, three, four, five, six days in advance," Uccellini adds.

Today, reliance on historical patterns for weather prediction is even less effective, as climate change continues to transform global weather behaviors, leading to unprecedented storms and heat waves.

WWII Weather Tip #2: You can't just focus on what's happening at ground-level

During the days leading up to the D-Day invasion, the Allies had access to extensive real-time information regarding upper atmospheric conditions, asserts Taylor from the Imperial War Museums. Without this critical data, they would have been ill-equipped to foresee the storm that delayed the invasion, as well as the brief period of calmer weather that allowed them to mount a surprise attack on German forces just a day later.

Much of this essential data was gathered using weather balloons. The film, directed by Anthony Maras, features atmospheric scenes of technicians deploying weather balloons in gusty conditions, as well as images of balloons ascending through storm clouds above the Atlantic. The tension escalates as both the audience and the film’s characters await the data transmitted back to the surface.

Presently, balloon measurements remain a foundational element of weather forecasting. The National Weather Service releases hundreds of balloons daily to gather data on atmospheric conditions and monitor evolving weather patterns.

Advancements in radar technology, which arose from World War II, also serve as crucial modern forecasting tools. Initially employed by the British to detect incoming Luftwaffe bombers, radar was complicated by its ability to also detect precipitation, which the British considered interference when trying to identify aircraft, explains Uccellini.

Numerous British radar experts relocated to the United States during the war for safety, collaborating closely with American scientists. "As soon as the conflict ended, radar became a significant topic within the meteorological community due to its capabilities in rainfall detection."

Over recent decades, the focus on upper atmospheric conditions has only intensified. Since the 1980s, the introduction of satellites has further enriched our comprehension of atmospheric dynamics, often acquiring thousands of measurements daily.

WWII Weather Tip #3: More advanced science = better weather forecasts

A significant takeaway from Pressure is that advancements in scientific understanding can be pivotal in wartime scenarios.

The film concludes with a quote attributed to Eisenhower, who reportedly informed John F. Kennedy that the Allies' victory in the war was partly due to "better meteorologists than the Germans."

Whether this quote accurately reflects Eisenhower's sentiments remains uncertain; historians Taylor and Blazich were not aware of any original documents that substantiate it, and the Eisenhower Presidential Library did not provide clarification.

Nonetheless, the concept expressed in this quote is recognized as valid by Taylor. Cutting-edge meteorological science played a vital role in shaping D-Day strategies and contributing to the Allied victory in World War II.

Moreover, the film illustrates how investments in atmospheric science translate into practical applications that can save lives, remarked Uccellini. Conversely, reliance on antiquated weather methodologies can yield disastrous outcomes.

This theme is particularly significant in light of recent efforts to curtail funding for climate science under the Trump administration, which sought to reduce staff and financial support across major federal research institutions, including the National Science Foundation (NSF), National Oceanic and Atmospheric Administration (NOAA), NASA, and research laboratories focusing on atmospheric and climate science.

Staffing cuts and a freeze on hiring resulted in significant understaffing at the National Weather Service, although the agency has since recruited hundreds of new workers due to pressure from lawmakers and former weather service leaders such as Uccellini.

The President's budget proposal for the upcoming fiscal year includes requests for substantial reductions to the NSF and related science agencies.

"I'm very concerned," Uccellini states, "when I see cuts to the NSF and cuts to NOAA laboratories." He emphasizes that as climate change increasingly exacerbates weather-related dangers and uncertainties, investment in weather science becomes even more crucial, particularly for federally funded initiatives aimed at understanding how atmospheric changes influence phenomena such as rapid droughts and extreme rainfall events.