VE Day and using the weather to gain military advantage
Why was the weather important?
Low tides and quiet weather were vital to getting such a huge number of troops onto the beaches of France.With a full moon giving good visibility and low tides expected on 5, 6 and 7 June, there was huge pressure to deliver a favourable weather forecast.Even now in a world of computer modelling, satellite and radar data and widespread observations, forecasting the weather 24 hours ahead of time can be a challenging task.But in 1944 it was even more difficult - not least the job of trying to predict conditions several days ahead.
A late weather observation
The invasion date was initially set for 5 June.But the army's Chief Meteorologist, Group Captain James Stagg spotted a potent area of low pressure set to move across the UK that day, bringing strong winds and extensive low cloud to the English Channel making the attempt too risky.Then as the weather charts were being drawn up on 4 June, a late weather observation from a ship in the Atlantic identified a potential brief ridge of high pressure building after the low passed.This, Stagg believed, would be enough to provide a "window of opportunity" and enough of a break in the weather for the invasion to take place on the 6 June instead.
Did the risk pay off?
The invasion went ahead on 6 June when the brief weather window opened up, but conditions were - if anything - slightly worse than expected and far from ideal.Low cloud sat over parts of the northern coast of France, limiting visibility of the ground to aircraft overhead. Winds were also stronger, making seas rougher and the tides higher. The Channel crossing became vomit-inducing and energy-sapping for many troops, making landing on the coast far more challenging than had been anticipated.However, the risk of taking the decision to invade in such marginal conditions paid off. The Germans were taken by surprise and the course of the war changed.BBC Weather and the Shipping Forecast at 100Weather history: Frost fairs in the Little Ice AgeHow much do you think you know about other battles throughout history where the weather played a role? Try our BBC Weather quiz and find out.
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