The 1899 San Ciríaco hurricane, also known as the 1899 Puerto Rico Hurricane or The Great Bahamas Hurricane of 1899, was the longest-lived Atlantic hurricane on record, and the third-longest-lived tropical cyclone globally on record (in terms of tropical duration) after 1994's Hurricane John in the Pacific Ocean and 2023's Cyclone Freddy in the southern Indian Ocean. It was also one of the deadliest Atlantic hurricanes in recorded history, with an estimated 3,800 fatalities. The third tropical cyclone and first major hurricane of the season, this storm was first observed southwest of Cape Verde on August 3. It slowly strengthened while heading steadily west-northwestward across the Atlantic Ocean and reached hurricane status by late on August 5. During the following 48 hours, the Cape Verde hurricane deepened further, reaching Category 4 on the modern day Saffir–Simpson hurricane wind scale (SSHWS) before crossing the Leeward Islands on August 7. Later that day, the storm peaked with winds of 150 mph (240 km/h). The storm weakened slightly before making landfall in Guayama, Puerto Rico with winds of 140 mph (220 km/h) on August 8. Several hours later, it emerged into the southwestern Atlantic as a Category 3 hurricane. The system paralleled the north coast of Dominican Republic and then crossed the Bahamas, striking several islands. Then, on August 14, it started to move north while still being located east of Florida. The storm recurved northeastward early the next morning and appeared to be moving out to sea. However, by August 17, it turned back to the northwest and made landfall near Hatteras, North Carolina early on the following day. No stronger hurricane has made landfall on the Outer Banks since the San Ciriaco hurricane.

The storm weakened after moving inland and fell to Category 1 intensity by 1200 UTC on August 18. Later that day, the storm re-emerged into the Atlantic. Now heading northeastward, it continued weakening, but maintained Category 1 intensity. By late on August 20, the storm curved eastward over the northwestern Atlantic. It also began losing tropical characteristics and transitioned into an extratropical cyclone at 0000 UTC on August 22, while located about 325 miles (525 km) south of Sable Island. However, after four days, the system regenerated into a tropical storm while located about 695 miles (1,120 km) west-southwest of Flores Island in the Azores on August 26. It moved slowly north-northwestward, until curving to the east on August 29. Between August 26 and September 1, the storm did not differentiate in intensity, but began re-strengthening while turning southeastward on September 2. Early on the following day, the storm again reached hurricane intensity. It curved northeastward and passed through the Azores on September 3, shortly before transitioning into an extratropical cyclone.

In Guadeloupe, the storm unroofed and flooded many houses. Communications were significantly disrupted in the interior portions of the island. Impact was severe in Montserrat, with nearly every building destroyed and 100 deaths reported. About 200 small houses were destroyed on Saint Kitts, with estates suffering considerable damage, while nearly all estates were destroyed on Saint Croix. Eleven deaths were reported on the island. In Puerto Rico, the system brought strong winds and heavy rainfall, which caused extensive flooding. Approximately 250,000 people were left without food and shelter. Additionally, telephone, telegraph, and electrical services were completely lost. Overall, damage totaled approximately $20 million, with over half being losses inflicted on crops, particularly coffee.

At the time, it was the costliest and worst tropical cyclone in the history of Puerto Rico. It was estimated that the storm caused 3,369 fatalities on the island territory. In the Bahamas, strong winds and waves sank 50 small crafts, most of them at Andros. Severe damage was reported in Nassau, with over 100 buildings destroyed and many damaged, including the Government House. A few houses were also destroyed on Bimini. The death toll in the Bahamas was at least 125. In North Carolina, storm surge and rough sea destroyed fishing piers and bridges, as well as sank about 10 vessels. Hatteras Island was almost entirely inundated with of water, and many homes were damaged. There was also much destruction at Diamond City, on the Shackleford Banks near Cape Lookout. There were at least 20 deaths in the state of North Carolina. In the Azores, the storm also caused one fatality and significant damage on some islands.

Meteorological history

The storm may have originated from a tropical wave that moved off the west coast of Africa. However, due to observational methods available to contemporary meteorologists, with ship reports being the only reliable tool for observing hurricanes, this is impossible to prove. A tropical storm was first observed about southwest of the southwesternmost islands of Cape Verde at 00:00 UTC on August 3. According to an article by the United States Hydrographic Office, the British steamship Grangense encountered the system later that day, while located about east-southeast of Guadeloupe. According to the ship's log, there was a "sudden change in the weather", falling barometric pressures, and increasingly rough seas. Further, the storm "showed all the symptoms of a genuine West Indian hurricane underdeveloped." The captain, who followed a route from Europe to Brazil for many years, noted that he never experienced "any weather of cyclonic character so far to the eastward before".

Thereafter, the storm strengthened and reached winds of 70 mph (110 km/h) early on August 4. Intensification halted until late on the following day, at which time the storm reached hurricane status. Around 18:00 UTC on August 6, it became a Category 2 hurricane. Early the next day, the system deepened to a Category 3. While approaching the Lesser Antilles, it continued to strengthen, reaching Category 4 status around midday on August 7. Shortly thereafter, the hurricane passed through the Lesser Antilles and made landfall on Guadeloupe. At 18:00 UTC on August 7, the system attained its peak intensity with a maximum sustained wind speed of 150 mph (240 km/h) and a minimum barometric pressure of , observed by a weather station on Montserrat.

The hurricane weakened slightly while moving west-northward across the Caribbean Sea and made landfall in Guayama, Puerto Rico late on August 8 with winds of 140 mph (220 km/h). August 8 was the namesday of Saint Cyriacus, hence the hurricane's nickname. Several weather stations across the island reported low barometric pressures, with a reading as low as in Guayama. Wind shifts were also experienced across the island, primarily in the south and the west. The storm crossed Puerto Rico in approximately six hours and emerged into the Atlantic Ocean late on August 8, while weakening to a Category 3 hurricane, with winds decreasing to 120 mph (195 km/h). The hurricane would maintain this intensity for more than nine days. Continuing west-northward, the hurricane brushed the north coast of Dominican Republic on August 9. Thereafter, the system moved slowly northwestward through the Bahamas, striking Inagua on August 10 and Andros Island on August 12. According to telephone and telegraph reports from the Weather Bureau, the storm was predicted to make landfall in Florida.

However, the storm instead curved north-northwestward and struck Grand Bahama on August 13. The next day, officials at the Weather Bureau predicted that the hurricane would strike Charleston, South Carolina, at which time it would have weakened "into an ordinary blow". The storm instead eventually turned northeastward and moved parallel to the coast of the Southeastern United States for a few days. By early on August 17, however, the hurricane re-curved northwestward. At 01:00 UTC on August 18, it made landfall near Hatteras, North Carolina, with winds of 120 mph (195 km/h). Five hours later, the storm weakened to a Category 2 hurricane. Around midday on August 18, it fell to Category 1 hurricane intensity while re-emerging into the Atlantic Ocean. Thereafter, the storm drifted slowly east-northeastward before accelerating to the northeast after 12:00 UTC on August 19. It moved parallel to Long Island and New England, until curving just north of due east late on the following day.

The system began losing tropical characteristics after interacting with a weather front and transitioned into an extratropical cyclone early on August 22, while situated about 325 miles (525 km) south of Sable Island, Nova Scotia. The extratropical system moved east-southeastward and then southeastward, while continuing to weaken. By August 24, it curved eastward and then northeastward the next day. Operationally, it was believed that the system remained extratropical. However, Partagas indicated that it regenerated into a tropical storm at 00:00 UTC on August 26, while located about 695 miles (1,120 km) southwest of Flores Island, Azores. Initially, the rejuvenated system drifted slowly north-northwestward, before turning northward on August 27. No change in intensity occurred for nearly a week. On August 28, it curved northeastward and then eastward, while continuing to drift.

By September 1, the storm began to accelerate and moved east-southeastward. It resumed intensification the next day after curving southeast, and was upgraded to a hurricane early on September 3, based on barometric pressure data. A few hours later, the hurricane attained a secondary peak intensity with a maximum sustained wind speed of 80 mph (130 km/h). Late on September 3, the storm passed through the Azores, shortly before transitioning into an extratropical cyclone. After becoming extratropical, the remnants moved rapidly northeastward and continued to weaken, before dissipating southwest of Ireland late on September 4. However, the Weather Bureau noted that gales prevailed offshore France until September 12, when the system merged with a low pressure area.

With just under 28 days as a tropical cyclone, this system became the longest-lasting Atlantic hurricane on record.

Preparations On August 7, after stations in the Lesser Antilles reported a change in wind from the northeast to the northwest, the United States Weather Bureau ordered hurricane signals at Roseau, Dominica, Basseterre, Saint Kitts, and San Juan, Puerto Rico; later, a hurricane signal was raised at Santo Domingo, Dominican Republic. Advisory messages were sent to other locations throughout the Caribbean, including Santo Domingo, Kingston, Jamaica, and Santiago de Cuba, Cuba. Information was also telegraphed to major seaports along the Gulf and East coasts of the United States. On August 9, hurricane signals were posted at Santiago de Cuba, while all vessels bound northward and eastward from Cuba were advised to remain in port.

Impact +Deaths by region Region Totaldeaths The Bahamas 334 Montserrat 100 Nevis 21 North Carolina 20 Puerto Rico 3,369 Saint Croix 11 Total: 3,855

Lesser Antilles While passing through the Leeward Islands, strong winds were reported on several islands. In Guadeloupe, the storm unroofed and flooded many houses and buildings, including the American Consulate in Pointe-à-Pitre. Communications were significantly disrupted in the interior portions of the island. Two schooners sunk and at least 23 flat boats were pushed ashore in the Îles des Saintes archipelago of Guadeloupe. Impact was severe in Montserrat, with nearly every building destroyed. The Courthouse and a school, both of which remained standing, became crowded with homeless women and children. One hundred deaths and fourteen hundred injuries were reported.