Great Hurricane of 1780
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Areas affected by the hurricane (excluding Bermuda)
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| Formed | October 9, 1780 |
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| Dissipated | October 20, 1780 |
| Highest winds | Gusts: 200 mph (320 km/h) |
| Fatalities | 22,000–27,501 (Deadliest Atlantic hurricane on record) |
| Areas affected | Lesser Antilles, Puerto Rico, Hispaniola, Bermuda, possibly East Florida and some U. S. states |
| Part of the 1780 Atlantic hurricane season | |
The Great Hurricane of 1780, also known as Huracán San Calixto, the Great Hurricane of the Antilles, and the 1780 Disaster, is the deadliest Atlantic hurricane on record. Between 20,000 and 22,000 people died throughout the Lesser Antilles when the storm passed through them from October 10–16. Specifics on the hurricane's track and strength are unknown since the official Atlantic hurricane database only goes back to 1851.
The hurricane struck Barbados with winds possibly exceeding 320 km/h (200 mph), before moving past Martinique, Saint Lucia, and Sint Eustatius; thousands of deaths were reported on the islands. Coming in the midst of the American Revolution, the storm caused heavy losses to British and French fleets contesting for control of the area. The hurricane later passed near Puerto Rico and over the eastern portion of Hispaniola. There, it caused heavy damage near the coastlines. It ultimately turned to the northeast and was last observed on October 20 southeast of Atlantic Canada.
The death toll from the Great Hurricane alone exceeds that of many entire decades of Atlantic hurricanes. Estimates are marginally higher than for Hurricane Mitch, the second-deadliest Atlantic storm, for which figures are likely more accurate. The hurricane was part of the disastrous 1780 Atlantic hurricane season, with two other deadly storms occurring in October.
The exact origin of the hurricane is unknown but it probably developed, as do many hurricanes, in the east Atlantic Ocean off the Cape Verde Islands in early October. The system strengthened and expanded as it tracked slowly westward and first began affecting Barbados late on October 9. Late on October 10, the worst of the hurricane passed over the island. Early on October 11, the hurricane turned north-northwest about 90 kilometres (56 mi) east of Saint Lucia, and later that night it neared the island of Martinique. The cyclone gradually weakened as it passed to the southwest of Dominica early on October 12 and subsequently struck the island of Guadeloupe.
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