Stora Skuggan Mistpouffer EdPLike trying to catch smoke with your bare hands Bem, Harry Potter and the Prisoner of Azkaban A Mistpouffer is an unexplained natural sound, a sonic boom like distant cannon fire that seems to come out of the fog over large lakes or rivers. It has been recorded all over the world throughout history, and is the source of many legends. In Japan the phenomenon is called uminari meaning cries from the sea. In Connecticut, the Machimoodus state park gets