I saw the day before yesterday a documentary about the weather forecast of D day and the crucial role played by a Scot and an Irish lady. It was on the French-German Arte and I thought that it was a French documentary, but seeking for the whereabouts I found at the end: that it was a documentary made for Ireland and also for Arte. I didn't find the version in English from Ireland, but the Arte version is still to see in French for those understanding French and I guess if you click on the tab of German that you will have it in German too as for Nielsen...
First my search for the events mentioned in the documentary:
https://www.bbc.com/news/uk-scotland-48498383
"Group Captain James Martin Stagg, from Dalkeith near Edinburgh, was the chief meteorological adviser who persuaded US General Eisenhower to change the date of the Allied invasion."


https://www.iwm.org.uk/history/how-d-day-was-delayed-by-a-weather-forecast

"Group Captain James Stagg - Eisenhower’s chief meteorologist - and his team of experts regularly rehearsed for D-Day. They were asked to prepare trial forecasts, which would then be checked for accuracy as each week progressed. Meteorologists used a number of tools to measure temperature, humidity, precipitation and cloud cover, but collecting and interpreting accurate data was difficult and the weather remained hard to predict. In the days leading up to D-Day, Stagg and his team forecast that weather conditions would worsen and on 4 June Eisenhower postponed the invasion by 24 hours.

The decision to postpone was a difficult one, as any delay made it increasingly difficult to keep the operation a secret. If the weather did not improve, D-Day would have to be delayed until the tides were again the Allies’ favour. This would not happen for another two weeks. But over the course of 4-5 June, Stagg predicted a temporary break in the weather. Based on this information, Eisenhower ordered that the invasion proceed on 6 June."


https://www.thetimes.co.uk/article/how-d-day-was-saved-by-an-irish-postmistresss-weather-forecast-zlx58frv8
https://wattsupwiththat.com/2014/06/06/the-weather-forecast-that-saved-d-day/

And about the Irish woman who send the forecast from the neutral Ireland
https://www.independent.ie/irish-news/retired-irish-postmistress-maureen-96-and-how-she-helped-alter-the-course-of-world-war-ii-38169177.html
"A 96-year-old retired Irish postmistress has recalled how she unwittingly helped to save the world - by pinpointing a storm which could have devastated the D-Day landings.
On June 3, 1944, the night of her 21st birthday, Maureen Sweeney, was taking pressure and temperature readings at Blacksod weather station on Ireland's west coast as part of her duties as a post office assistant."

And where I saw that the documentary was both for Ireland and Arte
https://www.mayoassociationdublin.com/2019/05/25/storm-front-in-mayo-the-story-of-the-d-day-forecast/

And for those who understand French or German the film that I saw (I guess also available in Ireland in English) I think it will remain for a further week to be viewed...
https://www.arte.tv/fr/videos/083920-000-A/juin-44-un-jour-de-meteo-favorable/

And now I understand why they were emphasizing on de Valera and the neutral Ireland and perhaps also about the Scottish James Stagg. I learned also about the Irish staying neutral and working in certain matters with the UK. I read in the past that there was also a whole party, who wanted to cooperate with the Germans and that was perhaps against the wish of de Valera, but while it is still such a touchy subject I will ask nordmann if it is opportune to start such an item on this board?

Kind regards from Paul.