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Hurricane Celia was a powerful, early-season Category 5 tropical cyclone that existed over the open waters of the eastern Pacific Ocean during late June 2010. Forming out of a tropical wave about 370 mi (595 km) southeast of Acapulco, Mexico on June 18, Celia quickly organized as deep convection consolidated around the center, attaining hurricane status by June 20. Over the following days, the hurricane's winds fluctuated as wind shear impeded significant development hindering it from becoming potientially dangerous. Once this shear lightened on June 24, the storm rapidly intensified to attain its peak strength with winds of 160 mph (260 km/h) and an estimated barometric pressure of 921 mbar (hPa; 27.2 inHg). Not long after reaching this strength, wind shear increased and the system entered a dry, stable environment. Over the following 42 hours, Hurricane Celia's sustained winds decreased to tropical storm force and the system began to stall over the open ocean by June 27. Despite highly unfavorable conditions, the storm managed to retain tropical storm status through June 28 and degenerated into a non-convective remnant low that evening. The remnants of Celia drifted northward, completing a counter-clockwise loop, and dissipated on June 30. Although Celia remained far away from any populated landmasses, waves from the storm prompted storm advisories along the southern coastline of Mexico. Additionally, its outer bands brought moderate rainfall to parts of Oaxaca and Guerrero. Due to the high intensity and longevity of the hurricane, it significantly contributed to the record-high accumulated cyclone energy value for June 2010 in the eastern Pacific basin. ==Origins== The precursor to Hurricane Celia was first identified on June 5, 2010 by the National Hurricane Center (NHC) as a disorganized area of disturbed weather associated with a tropical wave off the western coast of Africa in the Atlantic Ocean. Tracking westward, little development took place and the system eventually crossed Central America and entered the Pacific Ocean on June 17. Situated several hundred miles south-southeast of the Gulf of Tehuantepec, the disturbance moved slowly towards the west-northwest and little development was expected to occur. By June 18, scatterometer data of the system indicated that a surface circulation had developed and the system's overall structure had become increasingly organized.〔 Later that day, a Tropical Cyclone Formation Alert was issued for the system as it was now anticipated to become a tropical cyclone within 48 hours. At this time, convective banding features had begun wrapping around the system; however, it lacked deep, central cloud cover. Further development was expected to be slow due to moderate wind shear in the region of the low. Around 1800 UTC, the system had become sufficiently organized for the NHC to designate it as a tropical depression. At this time, the depression was situated roughly 370 mi (595 km) southeast of Acapulco, Mexico.〔 Operationally, the depression was not warned upon until early the next morning. Roughly 18 hours after being classified a depression,〔 deep convection wrapped around the center of the system, prompting the NHC to upgrade the depression to a tropical storm, and to give it the name Celia. Satellite overpasses of the storm revealed that Celia had already begun developing an eye-like feature at the surface, an indication that rapid intensification may ensue. The storm tracked relatively slowly towards the west-southwest in response to a mid-level ridge to the north. By the evening of June 19, Celia displayed a well-organized structure with an eye beginning to appear within the storm's central dense overcast. Due to the presence of easterly wind shear, intensification was briefly stalled for several hours; however, at 1800 UTC on June 20, the NHC upgraded Celia to a minimal hurricane as it attained winds of 75 mph (120 km/h).〔 An intermittent eye was seen on visible satellite image throughout the day, but it failed to fully consolidate by the afternoon of June 21, by which time the system appeared to be vertically tilted, having the low-level circulation displaced to the northeast of the mid-level circulation. Only modest strengthening took place during this time as the system's outflow was being restricted by continuing easterly shear. Late on June 21, Celia turned due west as it moved around the south side of the ridge previously steering the hurricane to the west-southwest. A secondary eyewall was noted as it made the turn, indicating that the storm would further intensify once this feature further developed. Several hours later, the storm intensified into a Category 2 hurricane on the Saffir–Simpson Hurricane Scale.〔 After briefly developing a prominent central dense overcast, the storm's structure began to degrade for unknown reasons. By the evening of June 22, Celia was downgraded to a Category 1 hurricane and the eye was no longer apparent on satellite imagery, mainly due to cirrus clouds over the system. The following morning, the eye reformed and the storm became more vertically aligned, allowing Celia to re-attain Category 2 status. Throughout the day, Celia became increasingly organized and intensified, nearly attaining major hurricane status during the afternoon.〔 Operationally, the hurricane was thought to have reached this intensity but post-storm analysis indicated that winds did not exceed 110 mph (175 km/h).〔 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 Celia (2010)」の詳細全文を読む スポンサード リンク
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