D-Day Weather Forecasts Kept by Unit at Scott AFB

By Robert Goodrich Of the Post-Dispatch | St Louis Post-Dispatch (MO), May 30, 1994 | Go to article overview

D-Day Weather Forecasts Kept by Unit at Scott AFB


Robert Goodrich Of the Post-Dispatch, St Louis Post-Dispatch (MO)


Weather forecasts compiled for Dwight D. Eisenhower's invasion of Normandy on D-Day 50 years ago are among the meteorological mementos kept by Air Weather Service at Scott Air Force Base

Eisenhower knew the importance of those forecasts, says Col. Gene J. Pfeffer, vice commander of Air Weather Service. Bad weather common to the English Channel in the spring could easily have botched the entire invasion on June 6, 1944.

Success would require an astonishing combination. As Eisenhower himself put it:

"We wanted to cross the Channel with our convoys at night so that darkness would conceal the strength and direction of our several attacks. We wanted a moon for our airborne assaults. We needed approximately 40 minutes of daylight preceding the ground assault to complete our bombing and preparatory bombardment. We had to attack on a relatively low tide because of beach obstacles which had to be removed while uncovered."

Troops also would need seas calm enough for landing in the surf and winds could not be strong enough to prevent parachute drops. After the initial assault, the Allies would require a stretch of reasonably good weather for landing reinforcements.

"That's a tall order," Pfeffer remarked with understatement.

Pfeffer was not yet two years old when the Allied invasion of Normandy took place. But in 30 years as a weatherman, he studied D-Day in depth.

"There were no weather satellites, no weather radars, no sophisticated computer forecasting techniques, and no large network of stations providing upper air data critical to longer range forecasting," Pfeffer wrote in a research paper while attending the Air War College. "Despite these limitations, the Allied weather team was imminently successful."

An American team led by Col. Donald N. Yates worked with British weather experts. Eisenhower had them start making five-day forecasts two months in advance. "He wanted to know how good they were," Pfeffer said.

The British Admiralty team, a team of forecasters from the British Medical Office and the American Army Air Corps team each thought themselves the best.

"They had even had some difficulty agreeing on what the current status of the weather was," Pfeffer said. "Needless to say there were some personality conflicts."

Eisenhower would need to know four days before D-Day if weather would halt the invasion, according to Pfeffer. Good weather the day of the invasion would be of little use if bad weather in the preceding days prevented force buildup and re-supply.

The same forecasters also had to furnish weather predictions for bombing missions and other operations in the two months before D-Day, aimed at disrupting German rail lines and bridges.

In the days before the invasion, they conducted a weather conference at 3 a.m. daily, in preparation for Eisenhower's daily staff meeting at 4:30 a.m.

On difficult days this conference sometimes "took on characteristics of a knock-down, drag-out fight among strongly opinioned professionals," Pfeffer wrote in his War College paper. "Each was convinced that his vision of the future weather in the Channel was correct, and each knew the incalculable cost of bad advice to the Supreme Commander. …

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