Film Dramatizes 72 Hours Before D-Day Weather Decision

Pressure, directed by Anthony Maras, portrays the three days before the D-Day landings when Allied leaders had to choose an invasion date based on weather forecasts. The screenplay by Maras and David Haig centers on meteorologist Captain James Stagg, played by Andrew Scott, who presented successive forecasts to General Dwight D. Eisenhower at Southwick House.

The film opens with Exercise Tiger, a training exercise held on April 28, 1944 at Slapton Sands. A timing error caused landing craft to arrive during live-fire bombing runs, resulting in heavy casualties. German U-boats also attacked the convoy after intercepting signals, leaving oil fires on the water and further losses.

Haig first encountered the story while researching an unknown Scottish figure for a play. He drew on Stagg’s memoir, Irving Crick’s memoir, Kay Summersby’s accounts, and Sverre Petterssen’s book on wartime meteorology. Maras said the production continued verifying details through the sound-mix stage, including radio-operator dialogue taken from original records.

Archival footage totaling about 50 hours informed period etiquette and operational procedures shown on screen.