Analysis of historical meteorological records shows that an extremely strong hurricane formed in the Atlantic basin in September 1183, which took an extreme track that affected most of the United States Eastern Seaboard. This hurricane, now known as The Devastating Hurricane of 1183, caused at least 10,000 fatalities throughout the continent that would eventually come to be known as North America. It formed at the height of the Medieval Warm Period, a period of warming in the early 1000s that preceded the Little Ice Age and the modern Warm Period.