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The Weather Window: How James Stagg Forecasted D-Day
War & conflict11 min

The Weather Window: How James Stagg Forecasted D-Day

In June nineteen forty-four, Group Captain James Stagg identified a narrow break in a brutal Atlantic storm, convincing Eisenhower to launch the Normandy invasion during a marginal twenty-four-hour window. While German forecasters, blinded by a lack of Atlantic data, predicted continued storms, Stagg’s high-stakes gamble on a brief ridge of high pressure decided the timing of the largest amphibious assault in history.

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Show notes

Allied forces required a specific alignment of a late-rising moon and low tide at first light.

Allied control of western observation networks provided superior pressure data compared to German weather services.

German commanders abandoned their posts for trips and war games because they predicted storms would persist.

James Stagg identified a brief high-pressure ridge that allowed for a narrow window of fair weather.

A delay beyond June sixth would have pushed the invasion back two weeks, risking German detection.

Conditions deteriorated into gale-force winds by June seventh, making the twenty-four hour window critical for success.

In this episode
  1. 01Intro1 min
  2. 02The Meteorological Gatekeeper2 min
  3. 03The Storm and the Postponement2 min
  4. 04The Atlantic Blind Spot2 min
  5. 05The Ridge of Hope2 min
  6. 06A Narrow Escape1 min
  7. 07Outro1 min
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The Weather Window: How James Stagg Forecasted D-Day — Fylom