Tomorrow is the 58th anniversary of D-Day, the Allied invasion of Europe, and the weather played a major role in what was the largest and most ambitious military expedition in history.

To prepare for that historic forecast, teams of British and American meteorologists pored over dozens of years of weather maps for the region to get a handle on typical storm patterns. Then, for months in advance, they prepared forecasts for the English Channel and the beaches of Normandy, just to establish credibility.

In a local connection, one of those forecasters was Dr. Francis Davis, who after the war went on to become a legend in Philadelphia television weather. During the war, Davis spent time at both MIT and the Pentagon where his forecasting team worked on - as implausible as it sounds even today - ten-day forecasts, all in hopes of pinning down the best time for the invasion. Tomorrow night, I'll tell you how the D-Day forecast worked out.