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Cyclone Sidr
Cyclone Sidr (JTWC designation: ''06B'', also known as Extremely Severe Cyclonic Storm Sidr) was a tropical cyclone that resulted in one of the worst natural disasters in Bangladesh. The fourth named storm of the 2007 North Indian Ocean cyclone season, Sidr formed in the central Bay of Bengal, and quickly strengthened to reach peak 1-minute sustained winds of 260 km/h (160 mph), making it a Category-5 equivalent tropical cyclone on the Saffir-Simpson Scale. The storm eventually made landfall in Bangladesh on November 15, 2007, causing large-scale evacuations.〔http://www.bangladesh-web.com/view.php?hidRecord=177458〕 3,447 deaths were blamed on the storm.
Save the Children estimated the number of deaths associated with the cyclone to be between 5,000 and 10,000, while the Red Crescent Society reported on November 18 that the number of deaths could be up to 10,000. International groups pledged US$95 million to repair the damage, which was estimated at $1.7 billion (2007 USD).〔
==Meteorological history==
On November 9, an area of disturbed weather developed southeast of the Andaman Islands, with a weak low-level circulation near the Nicobar Islands. Initially moderate upper-level wind shear inhibited organization, while strong diffluence aloft aided in developing convection. Vertical shear decreased greatly as the circulation became better defined, and a Tropical Cyclone Formation Alert was issued on November 11 while located a short distance south of the Andaman Islands. Around the same time, the India Meteorological Department (IMD) designated the system as Depression BOB 09. The Joint Typhoon Warning Center (JTWC) upgraded it to Tropical Cyclone 06B after Dvorak estimates indicated winds of 65 km/h (40 mph). Later that day, it intensified into a deep depression as it moved slowly north-westward.〔(WebCite query result )〕
The IMD upgraded the system to Cyclonic Storm Sidr early on November 12.〔(WebCite query result )〕 The system then began to intensify quickly as it moved slowly northwestward, and the IMD upgraded it to a severe cyclonic storm later that day〔(WebCite query result )〕 and a very severe cyclonic storm early the next day.〔(WebCite query result )〕 On the morning of November 15, the cyclone intensified to reach peak winds of 215 km/h (135 mph) according to the IMD,〔(WebCite query result )〕 and a peak of 260 km/h (160 mph) according to the JTWC best track.〔http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/2007/2007s-bio/bio062007.txt〕 Sidr officially made landfall around 1700 UTC later that day,〔(WebCite query result )〕 with sustained winds of 215 km/h (135 mph).〔(WebCite query result )〕 It weakened quickly after landfall and the final advisories were issued early on November 16.〔(WebCite query result )〕 The name Sidr was contributed by Oman; it is an Arabic name of a tree belonging to the genus ''Ziziphus'', specifically the ''Ziziphus spina-christi''. There is another saying that it is derived from the Sinhalese Language where "Sidr" means 'hole' or 'eye.〔(:The Daily Star: Internet Edition )〕
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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