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Tropical Storm Chris (2006)
Tropical Storm Chris was the fourth tropical storm of the 2006 Atlantic hurricane season. Forming on July 31 in the Atlantic Ocean east of the Leeward Islands from a tropical wave, Chris moved generally to the west-northwest, skirting the northern fringes of the Caribbean islands. Chris was a relatively short-lived storm, reaching a peak intensity with winds at 65 mph (100 km/h) on August 2, while positioned north of St. Martin. The storm gradually weakened before finally dissipating on August 5, near eastern Cuba. Overall impact was minimal, amounting to moderate amounts of rainfall throughout its path. No deaths were reported.
== Meteorological history ==
A tropical wave moved westward off the coast of Africa on July 27. Initially, virgorous convection persisted throughout the wave axis, though dry air greatly diminished the convection on July 28. The wind field remained well-defined as it continued westward, and deep convection increased two days later along the northern end of the wave axis. Dvorak classifications began on July 30 in response to an increase in vertical depth and organization of the convection. On July 31 a buoy recorded a change of wind direction from northeast to west, indicating a small low pressure area formed. Convective organization rapidly increased as it turned to the northwest, and the system developed into Tropical Depression Three on August 1 while located about 235 miles (375 km) east-southeast of Barbuda.
Forecasters initially predicted wind shear from an upper level low would prevent strengthening and cause dissipation within three days. However, the depression continued to organize as deep convection continued to develop near the circulation despite moderate amounts of wind shear, and the system intensified into Tropical Storm Chris six hours after developing.〔 The convection gradually consolidated over the system, and by late on the 1st Chris reached winds of 60 mph (95 km/h) while passing 50 miles (80 km) north of the northern Leeward Islands. The structure of Chris continued to improve and become more symmetrical, and an upper level eye feature developed early on August 2. Outflow improved in all quadrants, as well, and the storm reached a peak intensity of 65 mph (100 km/h) shortly thereafter while located 120 miles (195 km) east of St. Thomas. Despite initial predictions of Chris intensifying to a hurricane as a ridge of high pressure forced it west-northwestward, upper level shear dissipated the well-defined inner core of the storm, and Chris started to weaken.
Early on August 3, strong wind shear over Chris detached the deep convection from the low level circulation, while a building ridge to its north turned the storm towards the west into an area of drier air.〔 By mid-day on the 3rd the circulation was devoid of any convection within 85 miles (135 km), while the deeper convection spread across Puerto Rico and Hispaniola. Late on August 3, deep convection developed over the center of circulation again, though persistent vertical shear weakened Chris to a tropical depression on August 4. Due to computer models predicting lesser amounts of shear, forecasters indicated the possibility of moderate strengthening in the Gulf of Mexico to a 60 mph (95 km/h) storm. However, convection remained minimal, and Chris degenerated into a remnant area of low pressure late on August 4.〔 Late on August 5, convection increased in the remnants of the storm, and forecasters indicated the potential for slow development over the Gulf of Mexico due to marginally favorable conditions. Redevelopment never occurred, and the remnant circulation dissipated near Havana, Cuba on August 6.〔
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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