The Weatherman: The Man Who Decided D-Day

May 28 1944, SHAEF Advanced Headquarters, Portsmouth (D-Day -8)
Group Captain James Stagg was a worried man. May 28 1944, Senior Commander’s Briefing, Portsmouth (D-Day -8)
As Stagg prepared to deliver his daily briefing to Eisenhower, he thought about what the Supreme Commander would be hoping to hear. Comparing these collected requirements with historic weather patterns in the Channel was, in part, what had led Stagg and Yates to originally inform Eisenhower that May, June and July represented the best hope for suitable conditions.

Source: blog.usejournal.com