Question

When strong/high speed wind blows, an umbrella held upright at times gets
upturned. Explain the reason.​

Answer 1

Answer:

When strong or high speed wind blows,low pressure is created above the umbrella and high pressure inside the dome of it. As air pressure tries to equalise itself,it flows from high pressure to low pressure, hence upturning the umbrella.

Answer 2

Answer:

Because the wind blew in the direction of the person who is standing by taking an umbrella.

This could be the reason in my words.