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D Day WWII: June 6 will mark 70th anniversary of Normandy invasion.

How weather forecast from Mayo lighthouse saved D-Day invasion

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D Day WWII: June 6 will mark 70th anniversary of Normandy invasion.

On June 3, 1944, Irish Coast Guardsman and Blacksod lighthouse keeper Ted Sweeney delivered a weather forecast by telephone from Co Mayo’s most westerly point. The report convinced General Dwight D Eisenhower to delay the D-Day invasion for 24 hours, potentially averting a military disaster and changing the course of World War II.

June 6 will mark the 70th anniversary of the Normandy invasion that signaled the beginning of the end of the war in Europe. On Tuesday, 70 years to the day Sweeney delivered his weather report, the D Day Museum in Portsmouth will be presented with Sweeney’s original Blacksod observation sheets, collated by the Irish Met Service, and including the actual weather observations which proves so crucial to the invasion.

The Irish Independent reports that new evidence from Met Eireann forecasters reveals how the Blacksod Bay forecast changed the course of history.

Despite years of planning, in the days leading up to the attack, the Allied invasion would depend on one crucial and uncontrollable factor - the weather.

Although separate observations were taken at various locations by Royal Air Force, Royal Navy and United States Army Air Force meteorologists, an accurate forecast from the Irish Meteorological Service, based on observations from Blacksod on Mullet peninsula would be the most important.

Despite the country’s neutrality during the war,  Ireland continued to send meteorological reports to Britain under an arrangement which had been agreed since Independence.  According to the Irish Independent, Blacksod was the first land-based observation station in Europe where weather readings could be professionally taken on the prevailing European Atlantic westerly weather systems.

The Normandy invasion was originally planned for June 5. Nearly 5,000 ships and over 11,000 aircraft would carry approximately 156,000 troops into battle on the day across a 60-mile beachfront and into the interior of the Cotentin peninsula. Because of the importance of the landings by sea and by air,  the 6th and 7th, were also pinpointed as possible dates because moon and tide conditions were then deemed ideal.

However, British and American forecasters could not agree on the likely weather conditions for the planned date.

According to the memoirs of Scotsman James Stagg, the chief meteorologist for the Normandy Landings, by June 2, the Americans were optimistic for a 'go' on June 5, whilst the British were "unmitigatedly pessimistic.” An agreement could not be reached.

Then, in the early morning hours of June 3, Irish Coast Guardsman and lighthouse keeper Ted Sweeney sent his hourly weather observation report, containing a warning of "a Force 6 wind and a rapidly falling barometer" at Blacksod.

Group Captain Stagg, stationed at Southwick House outside Portsmouth,  studied the Blacksod report and advised General Dwight D Eisenhower to postpone for 24 hours. Eisenhower postponed the invasion to Tuesday June 6.

Sweeney, who died in 2001, said in an interview from 1994: "I was sending an hourly report 24 hours a day and night. It had to be phoned into London, (Dunstable). We got a query back.

"They asked for a check. 'Please check and repeat the whole report.' I was wondering what was wrong. I thought I had made some error or something like that. They sent a second message to me about an hour later to please check and repeat again. I thought this was a bit strange so I checked and repeated again. It never dawned on me that this was the weather for invading or anything like that. When I checked the report, I said: 'Thanks be to God, I was not at fault anyway.' I had done my job and sent over a correct reading to London."

New Met Eireann analysis has confirmed that Ted Sweeney's June 3 reports from Blacksod indicated a cold front lying halfway across Ireland and moving rapidly south eastwards and that a deep depression lay between Iceland and Scotland. Gale-force winds, low clouds and heavy showers would still be affecting the English Channel in the early morning hours of June 5.

On June 4, Sweeney sent a report saying that heavy rain and drizzle cleared, cloud at 900ft and visibility on land and sea very clear. An hour later, Blacksod would receive full clearance of the weather.

The following day, at Eisenhower's morning briefing, the latest report from Blacksod confirmed the passage of a cold front at Blacksod at noon on June 4 and confidence was restored, reports the Irish Independence.

Eisnehower’s long awaited weather clearance had arrived and he gave the order for Operation Overlord, as the invasion was named, to proceed. D-Day would be on June 6.

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