Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hurricane Ireneâ€“Olivia was the first actively tracked tropical cyclone that moved into the eastern Pacific Ocean from the Atlantic basin. It originated as a tropical depression on September 11, 1971, in the tropical Atlantic. The cyclone tracked nearly due westward at a low latitude, passing through the southern Windward Islands and later over northern South America. In the southwest Caribbean Sea, it intensified to a tropical storm and later a hurricane. Irene made landfall on southeastern Nicaragua on September 19, and maintained its circulation as it crossed the low- lying terrain of the country.