Isaac was a गंभीर उष्णकटिबंधीय तूफान tropical cyclone that formed in 北大西洋开阔水域 in 2006. The storm reached maximum sustained winds of 139 km/h (75 kt) 最低中心气压985hPatracking across 北大西洋开阔水域 in the North Atlantic basin (北半球).