Coming back from the Rally, I stayed at Safe Habor. I know the awning was out and I did not take it in and a storm came through during the night. I pulled away the next morning and then panicked a bit I asked the wife "you brought the awning in right?" she said no, I thought you did. I got out and checked and apparently it came in over the night on its own from the storm.
So I guess "storm-ish" wind speeds will do it