What explosion just happened over Qiqihar?

This is a man-made motor sound. Because there is a sudden loud noise in the sky when there is no lightning, first of all, don't consider the weather lightning factor, because there will be aircraft maneuvering in the sky.

When the plane flies normally, it will only make a roar, and there will be no loud noise. Only when accelerating before supersonic flight will there be a sonic boom and a loud noise. That's why!