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Tropical Storm Bertha (2002)
Tropical Storm Bertha was a minimal tropical storm that made landfall twice along the Gulf Coast of the United States in August 2002. The second tropical storm of the 2002 Atlantic hurricane season, Bertha developed in the northern Gulf of Mexico out of a trough of low pressure that extended into the Atlantic on August 4. It quickly organized and reached tropical storm strength before making landfall on southeastern Louisiana. Bertha turned to the southwest over the state, and re-entered the Gulf of Mexico on August 7. It remained disorganized due to proximity to land, and after making landfall on south Texas, Bertha dissipated on August 9.
Bertha was one of only three tropical cyclones to make landfall on both Louisiana and Texas; the others being Allison in 2001 and Fern in 1971. Heavy surf killed one person in Florida. The storm dropped moderate amounts of rainfall along its path, peaking at over 10 inches (250 mm) in eastern Louisiana and southern Mississippi. Damage was light, totaling to only $200,000 (2002 USD, $240,000 2008 USD).
== Meteorological history ==
A non-tropical trough at the surface extended from the northern Gulf of Mexico across Florida into the western Atlantic Ocean. On August 3, the western portion developed into a low pressure area. The eastern portion slowly organized and ultimately developed into Tropical Storm Cristobal. The low pressure area in the Gulf of Mexico steadily organized, and late on August 4 the circulation was organized enough for the National Hurricane Center to classify it as Tropical Depression Two while located 40 miles (65 km) east of Port Eads, Louisiana. Northeasterly wind shear initially prevented organization of the cloud pattern, though the depression was able to strengthen to become Tropical Storm Bertha about five hours after it formed.〔
Outflow became much better organized as Bertha became a tropical storm, and well-defined banding features persisted to the north of the storm. Though convection waned, forecasters predicted the friction between land and the warm atmosphere to redevelop more deep convection, potentially resulting in further strengthening. However, the storm failed to intensify, and Bertha made landfall near Boothville, Louisiana as a minimal tropical storm early on August 5. It slowly weakened over the swampy portions of southeastern Louisiana, and degenerated to a tropical depression later on the 5th after crossing Lake Ponchartrain.〔 Initially it was expected that a ridge of high pressure to its north would keep Bertha moving to the west and result in it slowly dissipating. However, it turned to the southwest, and reached the Gulf of Mexico again on August 7.〔 The circulation persisted over land, and Tropical Depression Bertha quickly redeveloped convection. Though the environment was not unfavorable, its proximity to land prevented re-strengthening to tropical storm status. Though the system showed periods of increased organization as it moved southwestward, Bertha remained a weak tropical depression until making landfall on south Texas to the east of Kingsville on August 9. Bertha weakened quickly over land, and dissipated over southern Texas ten hours after making landfall.〔
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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