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Severe Tropical Storm Chedza was a deadly tropical cyclone that struck Madagascar in January 2015. It formed from the intertropical convergence zone and moved over Mozambique, After moving open waters, the system began organizing on January 14, becoming Tropical Storm Chedza two days later. It quickly intensified over the Mozambique Channel due to warm waters and favorable conditions, and the storm attained peak 10 minute sustained winds of 100 km/h (65 mph) on January 16. That day, Chedza moved ashore western Madagascar between Belo sur Mer and Morondava, and it quickly crossed the island while weakening. The storm briefly re-intensified, passing southwest of Réunion before turning to the southeast. Chedza became extratropical on January 19, and was last noted two days later. The formative stages of Chedza brought rainfall to an already flooded region across southeastern Africa. Weeks of heavy rainfall killed 117 people in Mozambique and 104 in neighboring Malawi, where it was the worst floods in 24 years. In Madagascar, Chedza struck after weeks of heavy rainfall, causing rivers to increase and flooding widespread areas of crop fields. In the capital city of Antananarivo, the deluge damaged the main water pump that controlled water levels in the region. The rainfall caused mudslides and damaged roads. Across the country, flooding from Chedza displaced 54,792 people, after destroying 4,430 houses and flooding another 3,442, mostly in Vatovavy-Fitovinany in the southeastern portion. Chedza killed 80 people and caused about $40 million in damage (2015 USD). Later, the storm brought heavy rainfall and strong winds to the mountainous peaks of Réunion. ==Meteorological history== An area of convection, or thunderstorms, developed on January 9 within the intertropical convergence zone between the coast of Mozambique and the Mozambique Channel, while moving generally southward. It originated from the same monsoon trough that spawned the powerful Cyclone Bansi. A broad circulation formed within the system on January 12 along the coast of Mozambique, aided by good outflow to the south. Warm sea surface temperatures favored development, although it was located within an area of moderate to high wind shear. On January 14, the Météo-France (MFR) office on Réunion began monitoring the system, labeling it ''Zone of Disturbed Weather 6'' about 170 km (105 mi) east-southeast of Pebane, Mozambique.〔 A ridge to the north steered the system to the east-southeast. Convection continued to pulse around the system, some of the thunderstorms far from the center, and there were several circulations. The system quickly organized into Tropical Disturbance 6 by 12:00 UTC on January 14 as conditions became more favorable. The thunderstorms continued to fluctuate, exposing the circulation briefly, before the system became much better organized on January 15. Later that day, the disturbance intensified into Tropical Depression 6, and at 00:00 UTC on January 16, the MFR upgraded the system to Tropical Storm Chedza. At the same time, the Joint Typhoon Warning Center (JTWC) began tracking the system as Tropical Cyclone 05S. Despite having intensified into a tropical storm, Chedza initially resembled a monsoon depression. However, strengthening was expected due to low wind shear and the warm waters. The storm quickly intensified while approaching western Madagascar, and the MFR upgraded it to a severe tropical storm with peak 10 minute sustained winds of 100 km/h (65 mph). The convection wrapped into the circulation more as the circulation consolidated and became more defined, prompting the JTWC to estimate peak 1 minute winds of 95 km/h (60 mph). Before 18:00 UTC on January 16, Chedza moved ashore in western Madagascar between Belo sur Mer and Morondava, and it quickly weakened to tropical depression status over land. At around 10:00 UTC on February 17, Chedza emerged over open waters. By that time, the circulation was slightly exposed with the bulk of the convection along the southern periphery. Later on January 17, Chedza organized and re-intensified into a tropical storm. By contrast, the JTWC ceased issuing advisories on January 18, noting that the storm was dissipating due to increased wind shear. Chedza turned to the southeast toward a trough and continued strengthening. Although the MFR described the structure as "unconventional", the agency estimated a secondary peak of 95 km/h (60 mph). On January 19, the convection became far removed from the center as wind shear increased, and Chedza transitioned into a post-tropical cyclone as it began becoming extratropical. The MFR issued their last advisory on the storm on January 20, and they last noted the storm on the following day moving southward. 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「Tropical Storm Chedza」の詳細全文を読む スポンサード リンク
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