If you were going to look out the window to see the crazy storm, and you only opened the window just enough to lean out - which makes sense because of the wind and the rain - and you completely filled the window gap, then I could see it happening. Especially if the windows were near the corners where the flow would speed up and lower the pressure even more, and the wind happened to gust just at that moment, and you were high up where the winds would be stronger. It wouldn’t happen a lot - maybe something like three times in a city of millions of people, just to pull a number out of my arse.
It just takes a moment of bad luck, especially if you weren’t holding onto anything.