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The 1910 Cuba hurricane, popularly known as the Cyclone of the Five Days, was an unusual and destructive tropical cyclone that struck Cuba and the United States in October 1910. It formed in the southern Caribbean on October 9 and strengthened as it moved northwestward, becoming a hurricane on October 12. After crossing the western tip of Cuba, it peaked in intensity on October 16, corresponding to Category 4 on the Saffir-Simpson Hurricane Scale. That same day, the hurricane moved in a counterclockwise loop and hit Cuba again. It then tracked toward Florida, landing near Cape Romano. After moving through the state, it hugged the coast of the Southeastern United States on its way out to sea.

Due to its unusual loop, initial reports suggested it was two separate storms that developed and hit land in rapid succession. Its track was subject to much debate at the time; eventually, it was identified as a single storm. Analysis of the event gave a greater understanding of weather systems that took similar paths.

The hurricane is considered one of the worst natural disasters in Cuban history. Damage was extensive, and thousands were left homeless. It also had a widespread impact in Florida, including the destruction of houses and flooding. Although total monetary damage from the storm is unknown, estimates of losses in Havana, Cuba exceed $1 million and in the Florida Keys, $250,000. At least 100 deaths occurred in Cuba alone.

Meteorological history
In early October, 1910, anomalously low atmospheric pressures, often a locus for late-season development, persisted for several days over the Caribbean Sea. Based on subsequent surface weather observations mostly from ships, NOAA researchers working on reanalysis with the Hurricane Research Division determined that a tropical depression probably formed from a tropical disturbance in the extreme southern Caribbean by 06:00 UTC on October 9. After forming about 155 mi north of Panama City, Panama, it meandered for almost two days without significant strengthening, but finally intensified into the fifth tropical storm of the season by 00:00 UTC on October 11. The newly formed tropical storm then moved steadily north-northwestward, a trajectory it would maintain for a little more than three days. As it did so, the cyclone underwent more robust intensification beginning early on October 11—a trend that brought its maximum sustained winds to 75 mi/h by 12:00 UTC on October 12, making the system equivalent to Category 1 status on the modern-day Saffir-Simpson hurricane wind scale. On that day, the United Fruit Company steamship Abangarez issued a report indicating winds of Force 11 on the Beaufort scale, along with a barometric pressure of 29.30 inHg, at 09:00 UTC, giving the United States Weather Bureau its first confirmation of a storm in the Caribbean. As the storm advanced toward Cuba, this and other nearby observations helped the Weather Bureau map the path of the storm with good accuracy. Meanwhile, the cyclone continued to strengthen over the western Caribbean Sea, reaching winds of 105 mi/h as it passed about 75 mi southwest of George Town, Grand Cayman, early on October 13. By 00:00 UTC on October 14, the hurricane attained winds equivalent to those of a major hurricane on the Saffir-Simpson scale, and shortly afterward it struck the Isla de la Juventud with winds of 115 mi/h. As it did so, the cyclone, maintaining its strength, curved rather sharply to the northwest, bringing the center onto the mainland of Cuba near La Coloma, just southeast of Pinar del Río, in Pinar del Río Province. Moving inland over Cuba, the eye of the hurricane passed over the city of Pinar del Río at about 07:00 UTC; the local weather station registered calm winds and a minimum central pressure of 28.36 inHg.

As the storm impacted western Cuba, numerous ships and land stations reported hurricane-force winds, as well as very low pressures, extending north and south of the island. Some parts of Havana, the Cuban capital, estimated or measured winds up to 88 mi/h on October 14 as the storm passed southwest of the city, though official anemometers only recorded winds of 50 mi/h with gusts to 72 mi/h. Upon crossing the island, the hurricane weakened before emerging into the southeastern Gulf of Mexico with winds of 100 mi/h. Afterward, the storm slowed significantly in its forward speed; from October 15 on, its exact path and location became increasingly unclear to meteorologists. Vessel reports and land observations correctly suggested that the cyclone began moving westward into the Gulf of Mexico. Later studies would hypothesize that a strong ridge blocked the northward progression of the storm, forcing it to decelerate and meander. After nearly stalling for almost a full day, the cyclone, though little changed in strength, began a gradual arc to the southwest while centered about 185 mi west-northwest of Havana. As it did so, it reclaimed major hurricane status and then underwent a period of rapid intensification beginning at 00:00 UTC on October 16. Now drifting southward, the hurricane increased its winds from 115 mi/h to 150 mi/h in just 18 hours, making it equivalent to a strong Category 4 hurricane. At the time, forecasters were unable to determine the location of the storm, and some even believed that the system had dissipated. The storm underwent a sharp counterclockwise loop over the southeastern Gulf of Mexico before turning sharply eastward, heading back toward western Cuba by 06:00 UTC on October 17. Observations from Cuban stations between October 14–17 indicated that the movement of clouds and winds shifted, consistent with a storm returning to the island. While completing its loop, the hurricane battered several ships in the Gulf of Mexico; one of them, the Mallory steamship Brazos, experienced the storm for three days while en route from Texas to New York. The ship became incapacitated and drifted under extreme conditions, recording an unconfirmed minimum pressure of 27.10 inHg—the lowest its captain had ever witnessed. Based on this datum, some researchers concluded that the storm could have reached Category 5 status, which would have made it the first Atlantic storm on record to do so. However, because little information was obtained, researchers in 2000 refrained from upgrading the storm, leaving a hurricane in 1928 as the first Category 5 in the Atlantic, though subsequent work concluded that such a storm occurred even earlier, in 1924. Instead, researchers relied on a peripheral ship reading of 27.95 inHg to estimate a central pressure of 924 mb, supporting Category 4 rather than Category 5 status.

By 12:00 UTC on October 17, the storm ceased its loop and accelerated northeastward toward western Cuba. By then, it had already begun a weakening trend, but it still made its second landfall on Cuba as an even stronger hurricane, with winds of 145 mi/h. The storm struck the coast a short distance west of Minas de Matahambre, producing potent winds and much rainfall nearby. At the time, forecasters were still struggling to account for the location and movement of the storm. Posthumously, they postulated that two storms rather than one affected Cuba: the first storm dissipated over the Gulf of Mexico on October 16, while a new, second hurricane approached Cuba from the south. Until the early 1920s, this view held dominant in the meteorological community. When meteorologists reexamined available data from the time, however, they found that surface weather analysis contradicted their previous perspective. Two studies—each conducted separately by Cuban and American specialists—determined that a single storm, in close proximity to Cuba, had conducted a loop over the Gulf of Mexico and affected the island twice. To support their position, the researchers noted that ship observations indicated a single center, while land data consistently suggested a single, well-developed cyclone. Based on their interpretation, officials came to believe that a single storm had indeed been responsible for the effects. This view remains currently accepted and is reflected in the track contained in HURDAT, an official database holding data on tropical cyclones in the Atlantic and Eastern North Pacific areas. One major problem with the alternative view is that two major storms forming in close proximity are theoretically unlikely; both storms would have existed less than 150 mi apart. The original view may have persisted for several years because meteorologists had not yet experienced an erratic hurricane. In fact, the 1910 storm marked the first time that the U.S. Weather Bureau encountered a "loop hurricane." Initially, the mechanisms behind such storms—and behind erratic storm paths in general—remained poorly understood. The advent of upper-air radiosonde networks later showed, however, that changes in pressure patterns and heights often influenced the path of tropical cyclones. These often resulted in storms making sudden shifts in their tracks. As soon as the center of high pressure to the north of the storm weakened, the 1910 hurricane completed its loop and turned to the northeast.

Upon striking western Cuba for a second time, the storm increased in size and began posing a threat to Florida. The storm further increased its forward speed as it headed northeast, though its intensity continued to diminish. Its center passed a short distance south of the Dry Tortugas late on October 17. An American steamship called the Jean accidentally sailed into the eye of the storm at 16:25 UTC and measured a central pressure of 27.8 inHg. It had first encountered gale-force winds about 12 hours earlier. Reportedly, the lowest pressure occurred prior to the center, and the pressure was actually higher inside the eye, indicative of a hurricane diminishing in intensity. The ship remained in the eye for more than an hour before hurricane-force winds recommenced. Shortly after passing the Jean, the cyclone passed about 55 mi west of Key West with winds of 120 to 130 mi/h. As it did so, its path gradually bent to the north-northeast. The weather station at Sand Key Light estimated peak wind gusts of 125 mi/h and measured a barometric minimum of 28.4 inHg at 18:30 UTC. Nearby, winds were less intense in Key West, but still gusted to 110 mi/h. At 00:00 UTC on October 18, the hurricane made a sharp turn to the north, paralleling the mainland coast of Southwest Florida. The storm then lost major hurricane status just before making landfall over Punta Rassa with winds of 110 mi/h. (Operationally, weather officials believed that the storm actually entered land farther south, near Cape Romano. ) After making landfall at about 06:00 UTC, the storm moved inland near Fort Myers, where the local newspaper office recorded a central pressure of 28.2 inHg. Originally, the National Hurricane Center listed the storm as a Category 3 cyclone in Southwest Florida, but the storm featured a larger-than-average wind field and storm surges were lower than expected for such a strong storm. Revisions in 2000 downgraded the storm to Category 2 at landfall. Peak winds extended about 35 mi from the eye, indicating a large radius of maximum wind. The cyclone quickly weakened after moving inland.

The storm crossed inland portions of Central Florida early on October 18. The center traveled about 50 mi west of Lake Okeechobee and passed very close to the towns of Pine Level and Arcadia. The storm then headed past Lakeland, about 35 mi east of Tampa. By 18:00 UTC, the cyclone lost hurricane status, but still retained strong tropical storm status, with winds of 70 mi/h. The storm further weakened overnight to a moderate tropical storm. Early on October 19, the cyclone began a smooth curve to the north-northeast and passed only about 10 mi west of Jacksonville. The Weather Bureau office in the city reported peak winds of 65 mi/h and a barometric minimum of 29.09 inHg. Winds gradually veered from northeast to west. The storm later entered extreme southeast portions of the state of Georgia. Shortly after 12:00 UTC, the storm curled to the northeast on a path that brought it offshore, into the western North Atlantic, near Sapelo Island. Once over water, the storm restrengthened somewhat, approaching hurricane status with winds of 70 mi/h. Continuing on its curve, the storm paralleled the coastal Southeastern United States as it passed just southeast of Savannah and Charleston, South Carolina, late on October 19. On October 20, the storm began weakening for the final time and quickened its pace to the northeast. It brushed the Outer Banks of North Carolina, but apparently did not make landfall on those barrier islands. It bypassed Cape Hatteras shortly before 18:00 UTC. Afterward, the storm veered progressively to the east-northeast—a trend that continued for about a day—but by 06:00 UTC on October 21, it had forfeited its tropical characteristics. The non-tropical storm then angled to the east-southeast for two more days before losing its identity by 18:00 UTC on October 23; the storm still retained winds of 40 mi/h at that time.

Preparations and impact
On October 15, all vessels within a 500 mi radius of Key West were warned of the approaching storm, and many ships anchored in harbors. Throughout the region, storm warnings and advisories were issued.

Cuba
The storm wrought severe destruction in Cuba, considered to be among the worst effects from a tropical cyclone on record. High winds and torrential rainfall flooded streets, destroyed crops, and damaged plantations. In particular, the storm caused substantial damage to the tobacco in the region of Vuelta Abajo. Many towns were severely damaged or destroyed. The city of Casilda was devastated, while the town of Batabanó was inundated by flood waters. The hurricane cut off communications to inland areas. The majority of the fatalities and property damages were suspected to be in the Pinar del Río province.

The New York Times wrote that Cuba had "probably suffered the greatest material disaster in all its history". It was reported that thousands of peasants were left homeless due to the cyclone. Losses in Havana were also extensive; along the shore, scores of ships carrying valuable cargo had sunk. The storm also seriously damaged goods stored on local wharves and barges. "Tremendous" waves crashed ashore, flooding coastal areas. Numerous ships and small watercraft were wrecked by the cyclone. The raging seas submerged about 1 mi2 of Havana's oceanfront land. The Malecón sea wall breached, allowing flood waters to engulf the roadway there and residences in the area.

It is estimated that at least 100 people lost their lives, mostly due to mudslides, including five persons in Havana. However, reports range as high as 700. Initial estimates of the financial damage caused by the storm were in the millions of dollars, including losses of $1 million in Havana, largely from the destruction of Customs House sheds there, which were filled with many valuable goods. Some of these buildings were swept 0.5 mi away, and the winds tore the roof off the main warehouse. In the aftermath—while the hurricane was still widely considered to be two separate storms—rumors arose "of the approach of a third storm", although in actuality no additional storms were known to have occurred in the 1910 season.

Gulf of Mexico
A four-masted schooner, the Holliswood, became trapped in the storm in the Gulf of Mexico. The vessel departed from New Orleans on October 1, carrying cypress wood. The crew fought the storm for days and eventually the masts were cut to avoid capsizing. Waterlogged, the ship was blown miles off course. As described by the owner of the schooner, Paul Mangold:

"On Wednesday, the 12th, we began to get the first of the hurricane. We were running under very little canvas. Early Saturday morning we got the full force of the storm. We managed to get the sails fast and ran with the hurricane under bare poles. The wind circled about us sometimes at a hundred-mile rate. The seas came from all directions, though it was from the starboard that the real trouble seemed to come."

The steamboat Harold spotted the ship and rescued all of its crew except Captain E. E. Walls, who opted to stay behind with the order "Report me to my owners". At the time, the Holliswood was badly damaged, with her house destroyed and her rudder torn away. The crew apparently advised the captain that the ship would not stay afloat for another five hours, although he dismissed their concerns. After the crew was rescued, Captain Walls struggled against the storm for days without food or fresh water. On October 20, the Parkwood rescued Walls unconscious, but initially feared to be dead. Once aboard, he regained consciousness and, reportedly amidst an episode of delirium, asked to be returned to the Holliswood. Ultimately, the captain of the Parkwood agreed to tow the battered ship to shore.

Southern Florida
At Key West, pressures began to fall at midnight on October 12 as the storm approached from the southwest. By late on October 13, heavy rain had begun to fall, and winds began to increase, reaching 50 mph on October 14. Gusts reached 110 mph and storm tide ran 15 ft; swells in the area attained "unusually high" levels. Many docks were destroyed, and on October 17, the basement of the Weather Bureau office was submerged by rising waters. Before the rain gauge was washed out to sea, 3.89 in of precipitation was recorded. Damage throughout the Florida Keys was moderate, estimated at worth around $250,000 (1910 USD). Property damage was generally limited to structures along the shore.

As the storm progressed westward, Tampa and nearby locations started to experience its effects. Strong winds from the northeast blew water out of the Tampa Bay to the lowest level ever recorded. The barometer fell to 961 mbar (hPa; 28.4 inHg), and extremely high waves battered the shore from Flamingo to Cape Romano. The surf continued well inland, forcing survivors to cling atop trees. North of Tampa, the hurricane's effects were moderate or light, while in the southwestern part of the state, damage increased in severity. A portion of the local citrus crop was destroyed. Property damage was widespread from Tampa to Jacksonville and points south. High winds tore the roofs off homes and shook some structures off their foundations.

Seven men lost their lives in the wreckage of several Cuban schooners at Punta Gorda. Nearby, one man and a baby drowned as a result of the storm surge, and another died while attempting to cross a flooded river. A French steamship, the Louisiane, went ashore with 600 passengers; all people aboard the vessel were rescued by the Forward, a Revenue cutter.

Northeastern Florida and southern United States
Damage on the Atlantic coast was less severe, although at Jupiter, the Weather Bureau office reported: "the rainfall at this point did more damage than the wind. It had rained every day from the 3rd to the 13th, with a total fall of 5.96 in, and the creeks and flat woods were full of water when the first storm began. From the 14th to the 18th, inclusive, 14.27 in more fell. The inlet being closed the rivers rose 8 ft above normal high water, which in a flat country like this, puts practically all land under water from 1 ft to 8 ft. Fortunately the sea remained low and comparatively smooth so that it was possible to open the inlet and let the water out."

A large number of pine trees were blown down near the city of Jupiter. One man near Lemon City was killed by falling timber. Small watercraft, docks and boathouses sustained damage, but otherwise the storm's effects on the east coast were more moderate compared to other areas. Portions of the Florida East Coast Railroad bed were washed out, and repairs were anticipated to be costly. An American schooner blew ashore at Boca Raton, killing three and leaving the rest of the crew stranded for 12 hours until help arrived. Estimates of the cyclone's impact on citrus crops in the region vary widely.

On its way to sea, the storm passed just west of Jacksonville. Although very little damage occurred in and around the city, persistent northeasterly winds caused flooding in low-lying coastal areas. Minor flooding extended northward into Georgia and South Carolina; initially, interruptions of communication between cities led to exaggerated reports of damage in those states. Early on October 18, light precipitation began to fall in Savannah as the winds picked up. By October 19, winds had reached 70 mph. However, it was said that the city's worst damage came as a result of the high tides rather than the intense winds. Certain rivers exceeded their banks, submerging surrounding farmland. Minor damage occurred in Charleston, South Carolina.

Aftermath, records, and legacy
The storm is the second-strongest ever to enter the Gulf of Mexico in the month of October, behind only the Category 5 hurricane of 1924, which produced winds of 165 mi/h at landfall in Cuba and over nearby waters. The 1910 hurricane is also one of the strongest ever to make landfall on the island of Cuba and is tied with storms in 1944 and 1952: only a hurricane in 1932, Hurricane Gustav in 2010, and the 1924 hurricane were stronger. While the cyclone was later identified as a single storm, forecasters gained valuable experience in dealing with an unpredictable hurricane. Observations on the hurricane led to advances in the understanding of tropical cyclones with similar paths.