The D-Day landings were postponed twice while waiting for a gap in the weather. Group Captain Stagg’s forecast of a brief window on 6 June proved correct. Eisenhower gave the order. The ERA5 reanalysis now holds the wind record for that morning.
The poster is drawn from the ERA5 atmospheric reanalysis at 6 Jun 1944, 06:00 UTC — the real wind speed and direction, over a region centred on English Channel.
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