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The 2011 North Indian Ocean cyclone season was the ''least active'' tropical cyclone season in the North Indian Ocean since 1993.〔(【引用サイトリンク】url=http://www.rmcchennaieatlas.tn.nic.in/AnnualFreq_Output.aspx?Param=U2Vhc29uOjE4OTE6MjAxMToxOjI6Mzo6MjozOkJPQitBUytMYW5kOkNTK1NDUw== )(Note: Creation of an account in the website is required in order to access data.)〕 Only two cyclone storms have formed throughout the year, far below the average of 4-6. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. The scope of this article is limited to the Indian Ocean in the Northern Hemisphere, east of the Horn of Africa and west of the Malay Peninsula. There are two main seas in the North Indian Ocean — the Arabian Sea to the west of the Indian subcontinent, abbreviated ''ARB'' by the India Meteorological Department (IMD); and the Bay of Bengal to the east, abbreviated ''BOB'' by the IMD. This is the first season to have only two named storms since the 1993 North Indian Ocean cyclone season. However, multiple Depressions along with Cyclonic Storm Keila and Very Severe Cyclonic Storm Thane wreaked damage worth at least US$1.64 million and killing some 360 people overall. It is believed that El Niño, a quasiperiodic climate pattern that causes a rise in surface pressure over the Indian Ocean and makes the region drier is the main cause behind the below normal activity in the basin. ==Season summary== ImageSize = width:900 height:200 PlotArea = top:10 bottom:80 right:50 left:20 Legend = columns:3 left:30 top:58 columnwidth:270 AlignBars = early DateFormat = dd/mm/yyyy Period = from:01/02/2011 till:01/01/2012 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/02/2011 Colors = id:canvas value:gray(0.88) id:GP value:red id:TD value:rgb(0.38,0.73,1) legend:Depression/Deep_Depression id:TS value:rgb(0,0.98,0.96) legend:Cyclonic_Storm id:ST value:rgb(0.80,1,1) legend:Severe_Cyclonic_Storm id:VS value:rgb(1,1,0.8) legend:Very_Severe_Cyclonic_Storm id:ES value:rgb(1,0.56,0.13) legend:Extremely_Severe_Cyclonic_Storm id:SU value:rgb(1,0.38,0.38) legend:Super_Cyclonic_Storm Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till from:02/02/2011 till:03/02/2011 color:TD text:BOB 01 from:11/06/2011 till:12/06/2011 color:TD text:ARB 01 from:16/06/2011 till:23/06/2011 color:TD text:BOB 02 from:22/07/2011 till:23/07/2011 color:TD text:LAND 01 barset:break from:22/09/2011 till:23/09/2011 color:TD text:BOB 03 from:19/10/2011 till:20/10/2011 color:TD text:BOB 04 from:29/10/2011 till:04/11/2011 color:TS text:Keila from:06/11/2011 till:10/11/2011 color:TD text:ARB 03 barset:break from:26/11/2011 till:01/12/2011 color:TD text:ARB 04 from:25/12/2011 till:31/12/2011 color:VS text:Thane bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/02/2011 till:01/03/2011 text:February from:01/03/2011 till:01/04/2011 text:March from:01/04/2011 till:01/05/2011 text:April from:01/05/2011 till:31/05/2011 text:May from:01/06/2011 till:01/07/2011 text:June from:01/07/2011 till:01/08/2011 text:July from:01/08/2011 till:01/09/2011 text:August from:01/09/2011 till:01/10/2011 text:September from:01/10/2011 till:01/11/2011 text:October from:01/11/2011 till:01/12/2011 text:November from:01/12/2011 till:01/01/2012 text:December This season, 9 depressions developed out of low pressure areas, with six intensifying further into deep depressions, two deep depressions have developed into cyclonic storms, and one cyclonic storm intensified into a severe cyclonic storm. The first depression of the season developed on February 2 about 300 km (190 mi) to the east of Colombo, Sri Lanka. The depression brought isolated rainfall to parts of Sri Lanka, while remaining near stationary before weakening into an area of low pressure early the next day. Depression ARB 01 formed in early June near India, before Deep Depression BOB 02 formed a few days later. Land Depression 01 formed on July 22, and dissipated a day later. Depression BOB 03 formed on September 22, and soon made landfall on India. Depression BOB 03 dissipated the next day, on September 23. October was a much more active month, as Deep Depression BOB 04 and Deep Depression ARB 02 both formed, during this period of time. Then Cyclonic Storm Keila formed in November and came ashore in Oman, before Depression ARB03 formed and dissipated near the Oman coast. 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「2011 North Indian Ocean cyclone season」の詳細全文を読む スポンサード リンク
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