vee kohal tekkinud õhukeeris, phenomenon similar in formation to a tornado, but with the funnel forming over an ocean or occasionally over an inland lake emerges from the base of cumulonimbus clouds, frequently clouds that have been swept off an adjacent land area, tornado que se forma por encima de la superficie del agua; se caracteriza por su tendencia a disiparse al llegar a la orilla, trombe au-dessus d'une surface d'eau; elle a tendance à se dissiper lorsqu'elle atteint le rivage