Why does wind inside a stadium blow opposite the wind above the stadium?

Question

In a (American football) bowl stadium, the flags on top of the goalposts typically fly in the opposite direction of the flags above the stadium, particularly when the wind is blowing heavily. Why is that?

In: 0

Answer 1

Low pressure behind the windward wall and high pressure in front of the leeward wall of the stadium causes a circulatory current. Bernoulli’s principle at work.