Most likely a microburst (they are common here) that lasted maybe a minute. Then someone came to my office door to announce what had happened near the entry to our auditorium.
"The wind blows where it wants to and you hear the sound of it, but you don't know where the wind comes from or where it is going. It is the same with every person who is born from the Spirit." (John 3:8 New Century Version)
In recent times I am seeing it over and over. The wind of God's Spirit blows into the life of a Christ-follower and changes everything. Old norms are turned upside-down and God (not religion, not rules) makes everything new. I never cease being amazed at the power of it.