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Hurricane Iris of 2001 was the most destructive hurricane in Belize since Hurricane Hattie in 1961. Iris was the second-strongest storm of the 2001 Atlantic hurricane season, behind Hurricane Michelle. It was the ninth named storm, fifth hurricane, and third major hurricane of the year, forming from a tropical wave on October 4 just southeast of Barbados. It moved westward through the Caribbean, intensifying into a tropical storm on October 5 south of Puerto Rico and into a hurricane the following day. While passing south of the Dominican Republic, Iris dropped heavy rainfall that caused landslides, killing eight people. Later, the hurricane passed south of Jamaica, where it destroyed two houses. On reaching the western Caribbean Sea, Iris rapidly intensified into a Category 4 on the Saffir–Simpson scale. A small hurricane with an eye of only 7 mi (11 km) in diameter, Iris reached peak winds of 145 mph (230 km/h) before making landfall in southern Belize near Monkey River Town on October 9. The hurricane quickly dissipated over Central America, although its remnants contributed to the formation of Tropical Storm Manuel in the eastern Pacific Ocean. Destruction was heaviest in Belize and totaled $250 million (2001 USD). Because Iris was compact, the damage was largely confined to 72% of the houses in the Toledo district and 50% of the houses in the Stann Creek district. The hurricane damaged or destroyed 3,718 homes nationwide, and wrecked more than 95% of the homes in 35 villages in the poorest parts of the country. Iris left about 15,000 people homeless, many receiving assistance from the government and the local Red Cross chapter. High winds also damaged large swaths of forest and crops, mostly affecting the banana industry. Iris killed 24 people in Belize, including 20 who died when a scuba diving boat capsized near Big Creek. The storm also killed eight people and damaged about 2,500 homes in neighboring Guatemala, and later dropped heavy rainfall in southern Mexico, where two people died. ==Meteorological history== Toward the end of September 2001, a poorly defined tropical wave moved westward across the tropical Atlantic Ocean through an area of hostile wind shear, which was caused by a large upper-level low within a trough to the northeast of the Lesser Antilles. A few days later, the upper-level low detached from the trough and moved southwestward over the Caribbean Sea, allowing for an upper-level ridge, or high-pressure area, to form over the tropical wave. The change provided a favorable environment for tropical development, and an area of convection soon blossomed along the wave's axis. As the tropical wave approached the Lesser Antilles, a mid-level wind circulation formed within the deepest part of the convection, and a low-level circulation became gradually more pronounced on satellite imagery. Although its low-level circulation was small and poorly defined, the system increased in organization enough to be classified as Tropical Depression Eleven at 12:00 UTC on October 4, located about 100 mi (160 km) southeast of Barbados.〔 Operationally, however, Hurricane Hunters did not confirm the depression's formation until nine hours later. In its early stages, the depression moved west-northwestward between the islands of St. Vincent and St. Lucia under the influence of a strong ridge to its north. Compared to its appearance 24 hours before forming, the depression exhibited improved outflow and more distinct convection, although its lower circulation remained very poorly organized.〔 This was confirmed by a Hurricane Hunters flight into the system, which failed to report a closed circulation despite the depression's well-organized appearance on satellite imagery. At 21:00 UTC on October 5, they reported a strengthening circulation with flight-level winds of 74 mph (119 km/h), corresponding to a surface wind intensity of 60 mph (95 km/h). Based on these data, the depression was upgraded to Tropical Storm Iris, situated about 155 mi (250 km) south of the southern coast of Puerto Rico. In post-season analysis, the National Hurricane Center (NHC) estimated that Iris had attained tropical storm status about nine hours earlier.〔 Despite the storm's intensification and well-organized satellite appearance, the circulation failed to become better defined.〔 In their first discussion on Iris, the NHC mentioned the potential for the system to degenerate into a tropical wave if it maintained its fast forward speed.〔 One forecaster noted that the center was fragile and that the cyclone could dissipate quickly if it encountered stronger wind shear to its south.〔 Although its overall appearance did not change significantly, the Hurricane Hunters reported a closed eye with a diameter 23 mi (37 km) and a stadium effect (eyewall curvature) on October 6. Later that day, Iris reached hurricane strength just southwest of the southern tip of the Dominican Republic,〔 and the NHC remarked that land interaction with the Greater Antilles was the only factor impeding further development. After Iris reached winds of 85 mph (140 km/h) early on October 7, its intensity remained steady for about 24 hours.〔 During that time, the satellite appearance became slightly ragged as its outflow became restricted, possibly due to an upper-level low. By late on October 7, the area of hurricane force winds associated with Iris extended only 25 mi (35 km) from its 16 mi (22 km) wide eye. Early on October 8, after turning west-southwestward away from the Greater Antilles, Iris began strengthening again, with warm waters and an absence of significant wind shear. The NHC predicted peak winds of 105 mph (165 km/h) before the storm would hit Belize. It rapidly intensified with the favorable conditions, intensifying from 95 mph (150 km/h) to 140 mph (225 km/h) in a 12-hour period on October 8, making Iris a Category 4 hurricane on the Saffir-Simpson scale; in the same duration, the minimum central pressure dropped 38 mbar (1.12 inHg).〔 While intensifying, the hurricane developed concentric eyewalls, with an innermost eye having a diameter of 7 mi (11 km). For comparison, the smallest known eye diameter on record for an Atlantic hurricane was about 3 mi (5 km), during Hurricane Wilma in 2005. With such a small eye, a Hurricane Hunters flight could not deploy a dropsonde into the center of Iris,〔 and shortly after the flight, the innermost eye collapsed as the core paralleled the Honduras coastline just offshore. This resulted in a temporary and slight weakening during an eyewall replacement cycle, but within a few hours Iris re-intensified to attain peak winds of 145 mph (230 km/h) just off Belize. At 02:00 UTC on October 9, it made landfall at peak intensity in Monkey River Town in the southern portion of Belize.〔 Initially, Hurricane Iris was forecast to remain a tropical cyclone while crossing Central America and to re-intensify in the eastern Pacific Ocean; had it done so, it would have retained the name Iris.〔 Instead, the hurricane rapidly weakened after moving into the mountainous terrain of Guatemala, and within six hours of landfall the hurricane weakened to a tropical storm. Late on October 9, within sixteen hours of landfall, the circulation dissipated over extreme southeastern Mexico.〔 As the remnants approached the Pacific Ocean, a new area of convection developed south of the original circulation of Iris. It gradually organized while continuing westward, developing into Tropical Storm Manuel; the new storm ultimately lasted until October 18 before succumbing to cooler waters and wind shear. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hurricane Iris」の詳細全文を読む スポンサード リンク
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