GAINESVILLE, Fla. (WCJB) - Today marks eighty one years since the largest naval invasion in history, also known as D-Day, when over 150,000 allied troops landed on the Normandy beaches.

In order for the Normandy landings to succeed a lot of things had to go right, including a full moon, low tide, light winds, and of course decent weather. However, predicting the weather at the time was extremely difficult, especially since meteorologists didn’t have access to satellites, weather radars, and computer models.

Since meteorologists mainly relied on surface observations at the time, predicting the weather more than a day out was considered an educated guess. However, thousands of allied troops still relied on the weather forecast.

So on June 4th 1944, allied leaders were worried the invasion

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