WATCH: The wonder of Severn – rare 'tidal wave' on British river caught on camera Nature THIS is the dramatic moment a rare ‘tidal wave’ surged down the River Severn. Share: Email ThisBlogThis!Share to XShare to Facebook Related Posts:Pet WARNING this Christmas: Owners told NOT to feed animals leftover snacks and nibblesWATCH: Killer whale clutches SHARK in its jaws in dramatic drone footagePampered Pets: My cat is always begging for food, should I worry?Pet WARNING this Christmas: Owners told NOT to feed animals leftover snacks and nibblesWATCH: Killer whale clutches SHARK in its jaws in dramatic drone footage