The 1856 Last Island hurricane (also known as the Great Storm of 1856) was a deadly and destructive tropical cyclone that is tied with 2020's Hurricane Laura and 2021's Hurricane Ida as the strongest hurricane on record to make landfall in the U.S. state of Louisiana, as measured by maximum sustained winds. The first known tropical cyclone of 1856 Atlantic hurricane season, it was observed first as a minimal hurricane in the Gulf of Mexico near Dry Tortugas on August 9. Moving northwestward, the cyclone quickly intensified into a strong Category 4 hurricane on the modern-day Saffir–Simpson scale by the following day. Late on August 10, the hurricane made landfall on Last Island, Louisiana, with winds at , hours before striking near New Iberia. The system rapidly weakened after moving inland, falling to tropical storm intensity on August 11. The storm would be last noted over Mississippi on the next day. Offshore, at least 183 people drowned after steamers and schooners sank in rough seas produced by the hurricane. A storm surge between completely submerged Last Island in Louisiana, destroying virtually every structure, including the hotels and casinos, while all crops were ruined. Additionally, Last Island itself was split in two. Inland, heavy rainfall caused the Mermentau River to flood, destroying crops and every house in Abbeville. The storm produced as much as of precipitation in New Orleans. In Plaquemines Parish, rice fields were under several feet of water, while many orange trees lost their fruit. Overall, the hurricane resulted in at least 300 fatalities. Meteorological history The cyclone was first detected in the eastern Gulf of Mexico west-northwest of Key West, Florida, on August 8, 1856. Because it was already a hurricane when it was first observed, it probably had developed further east than here. It advanced steadily northwest, strengthening to the equivalent of a Category 3 hurricane. The hurricane gradually slowed prior to landfall on August 10, and it attained its estimated peak intensity of . It was a tropical cyclone of small diameter, and its maximum sustained winds may have reached Category 5 status, but were unrecorded. During the early evening of August 10 the northeastern edge of the eye crossed over Last Island (Official name: Isle Dernière) before making landfall a few hours later south of New Iberia, Louisiana. The cyclone is believed to have struck southern Louisiana at peak intensity with an approximate central pressure