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Hurricane Nate (2011)
Hurricane Nate caused minor damage in southeastern Mexico in mid-September 2011. The sixteenth named storm and fourth hurricane of the 2011 Atlantic hurricane season, Nate originated from a frontal trough in the Bay of Campeche on September 7. Within a weak steering environment, the storm meandered southwestward while gradually gaining strength. Though classified as a tropical storm operationally, data during a post-season review indicated that Nate briefly attained Category 1 hurricane status on the Saffir–Simpson hurricane wind scale on September 8. As a result of its slow motion, the storm caused significant upwelling, leading to a marked decrease in convection, and weakening accordingly. On September 11, Nate moved ashore Mexico as a tropical storm, producing several inches of rainfall and damaging several hundred structures. Ten oil rig workers went missing; seven were rescued, but one died of an unknown cause, and three other bodies were later recovered. In Veracruz, a boy was killed after being struck by lightning.
==Meteorological history==
On September 5, a frontal trough, the same responsible for the extratropical transition of Tropical Storm Lee, passed through the western Gulf of Mexico before stalling in the central Gulf of Mexico and Bay of Campeche. At the tail-end of the trough, increased shower and thunderstorm activity associated with a developing low-pressure area prompted the National Hurricane Center (NHC) to begin monitoring the disturbance for tropical cyclone formation the next day. The low separated from the front early on September 7, but convection was too disorganized for classification at the time. By 1800 UTC, however, a curved band developed in the western semicircle of the circulation.〔 In accordance with satellite imagery, surface observations from land and oil rigs, and data from a reconnaissance aircraft, the disturbance was upgraded to Tropical Storm Nate, positioned roughly 160 mi (260 km) north of Villahermosa, Mexico.〔
Within a weak steering environment between a mid-level ridge over northern Mexico and a mid-level ridge over the northern Caribbean Sea, Nate drifted slowly southwestward initially. Though an abundance of dry air was expected to limit a rapid rate of intensification, warm sea surface temperatures and light to moderate wind shear allowed for gradual strengthening. Operationally, the system attained its peak intensity with maximum sustained winds of 70 mph (120 km/h) and a minimum barometric pressure of 994 mb (29.35 inHg) on September 8. However, as part of its post-season routine, the NHC received data from an offshore oil rig in the southeastern quadrant of the system that yielded maximum sustained surface winds of 77 mph (124 km/h); as a result, Nate was re-designated as a Category 1 hurricane on the Saffir–Simpson hurricane wind scale while centered approximately 80 mi (110 km) north-northwest of Ciudad del Carmen, Mexico. Following peak intensity, the storm's broad wind field and slow forward motion led to significant ocean upwelling. With cooler sea surface temperatures and low ocean heat content, the coverage of deep convection decreased and Nate weakened to a tropical storm at 0600 UTC on September 9.〔
While accelerating west-northwest and eventually westward in response to an eastward shift in the ridge over Mexico, Nate moved away from cooler ocean temperatures, briefly allowing it to gain strength on September 10. By the next day, however, increasingly dry, low- to mid-level air wrapped into the circulation, causing associated convection to collapse. At 1600 UTC on September 11, the system made landfall near Barra de Tecolutla, Mexico, with winds of 45 mph (75 km/h). The rugged terrain of Mexico caused Nate to rapidly weaken once inland, and the cyclone degenerated into a remnant low by 0000 UTC on September 12, about 20 mi (30 km) west of Poza Rica, Mexico. The circulation dissipated six hours later, at 1200 UTC on September 12.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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