1878 Haiti–Florida hurricane

The 1878 Haiti–Florida hurricane, also known as the Kissimmee hurricane, was a large, slow-moving Atlantic hurricane that was the most severe to impact the island of Trinidad since 1838. It also caused significant damage to portions of the Greater Antilles, chiefly Hispaniola, and eastern North America, primarily via powerful winds, storm surge, and rainfall-induced flooding. The fifth tropical storm and fourth hurricane of the annual season, it developed over the western tropical Atlantic north of South America on September 1; well formed at the time, it likely originated farther east but went undetected. Quickly strengthening into a hurricane, it impacted the Windward Islands, extensively damaging watercraft, infrastructure, and agriculture, but causing few fatalities. Three days later it struck Hispaniola with winds up to 90 mph (150 km/h), flattening numerous buildings, devastating crops, and claiming at least 16 lives, though estimates ranged upward of several hundred due to the scale of destruction, which dispersed entire populations. A day later the cyclone hit Cuba as a minimal hurricane, spreading relentless rainfall, along with crop damage, over portions of the island and the Lucayan Archipelago as it drifted near the country's northern coast for a few days.

On September 7 it suddenly veered northward, impacting the Florida Keys and southern Florida peninsula as a high-end tropical storm. Over the next three days it slid west-northwest, wandering back offshore over the eastern Gulf of Mexico. There it rapidly restrengthened, peaking with winds of 105 mph (165 km/h), and backtracked, moving inland over the Nature Coast on September 10. For several days the storm—its effects heightened by its size, slow motion, and a surrounding high-pressure area—delivered copious rain, gusty winds, and high tides to Florida, as it moved erratically over or near much of that state. The rains soaked wide swaths of the south-central peninsula, swamping riparian zones in the region, above all the areas northwest of Lake Okeechobee, while stiff winds downed trees, telecommunications, and fragile structures over a broad cross-section of the state, resulting in a fatality. The storm alternately shed and regained hurricane intensity within a few days of crossing Florida, arcing more to the north before making a final landfall in South Carolina—with Saffir–Simpson winds ranking it a strong Category 1 storm—on September 12. It then sped inland, its tropical features unraveling over West Virginia a day later before dissipation over Canada.

The storm buffeted ships offshore Cuba, the Bahamas, and the United States, causing wrecks from the Florida to the Carolinas. Staple and other crops suffered damage from wind and rain, mainly in low-lying areas near water on the coastal plain. Most casualties in the Southeast north of Florida were from drownings or hurricane-spawned tornadoes, some retroactively rated F2 or stronger by meteorologists, that claimed four lives from the Carolinas to Virginia. Historic floods attended the storm's trek across the Appalachian Mountains and into Canada, with fast-rising rivers engulfing communities in several U.S. states and a few Canadian provinces. Railroads and other vital infrastructure, such as bridges, in both nations bore the brunt of the storm, owing to local hydrological milestones set by the storm, such as river rises and rainfall amounts unseen in years. At least 11 of the 32 dead in the U.S. were railroad employees whose trains collapsed due to mudslides or cave-ins from floodwaters. All 10 deaths in Canada were flood-related, as the storm was responsible for major inundations in Greater Toronto and adjourning areas. Cumulatively, the cyclone was blamed for at least 60 deaths and over $900,000 in losses.