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The 2009 Atlantic hurricane season was a below-average year in which nine tropical storms formed, the fewest since 1997.〔An average season has eleven tropical storms, six hurricanes and two major hurricanes.〕 Although Tropical Depression One formed on May 28, 2009, the season officially began on June 1 and ended on November 30.〔 The season's last storm, Hurricane Ida, dissipated on November 11. The season had eleven tropical depressions, of which nine intensified into tropical storms, three became hurricanes, and two became major hurricanes.〔A major hurricane is a storm that ranks as Category 3 or higher on the Saffir-Simpson Hurricane Scale.〕 The inactivity throughout the basin was linked to the formation of an El Niño, which increased wind shear.〔 The two most significant storms of the season, in terms of loss of life and damage, were Hurricanes Bill and Ida. Hurricane Bill was an unusually large storm and was also the season's strongest, attaining winds of 135 mph (215 km/h).〔 Tropical Storm Claudette was the only storm during 2009 to make landfall in the United States; Hurricane Ida became extratropical shortly before coming ashore in Alabama. This timeline includes information that was not operationally released, meaning that information from post-storm reviews by the National Hurricane Center, such as a storm that was not operationally warned upon, has been included. This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. ==Timeline of events== ImageSize = width:800 height:200 PlotArea = top:10 bottom:80 right:20 left:20 Legend = columns:3 left:30 top:58 columnwidth:270 AlignBars = early DateFormat = dd/mm/yyyy Period = from:01/05/2009 till:01/12/2009 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/05/2009 Colors = id:canvas value:gray(0.88) id:GP value:red id:TD value:rgb(0.38,0.73,1) legend:Tropical_Depression_=_≤39_mph_(≤62_km/h)_(TD) id:TS value:rgb(0,0.98,0.96) legend:Tropical_Storm_=_39–73_mph_(63–117_km/h)_(TS) id:C1 value:rgb(1,1,0.80) legend:Category_1_=_74–95_mph_(118–153_km/h)_(C1) id:C2 value:rgb(1,0.91,0.46) legend:Category_2_=_96–110_mph_(154–177_km/h)_(C2) id:C3 value:rgb(1,0.76,0.25) legend:Category_3_=_111–130_mph_(178–209_km/h)_(C3) id:C4 value:rgb(1,0.56,0.13) legend:Category_4_=_131–155_mph_(210–249_km/h)_(C4) id:C5 value:rgb(1,0.38,0.38) legend:Category_5_=_≥156_mph_(≥250_km/h)_(C5) Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:11 align:left fontsize:S shift:(4,-4) anchor:till from:28/05/2009 till:29/05/2009 color:TD text:One (TD) barset:break from:11/08/2009 till:13/08/2009 color:TS barset:break from:15/08/2009 till:16/08/2009 color:TS text:Ana (TS) from:15/08/2009 till:24/08/2009 color:C4 text:Bill (C4) from:16/08/2009 till:18/08/2009 color:TS text:Claudette (TS) from:26/08/2009 till:29/08/2009 color:TS text:Danny (TS) from:01/09/2009 till:03/09/2009 color:TS text:Erika (TS) barset:break from:07/09/2009 till:12/09/2009 color:C3 text:Fred (C3) from:25/09/2009 till:26/09/2009 color:TD text:Eight (TD) from:04/10/2009 till:05/10/2009 color:TS text:Grace (TS) from:06/10/2009 till:08/10/2009 color:TS text:Henri (TS) from:04/11/2009 till:10/11/2009 color:C2 text:Ida (C2) bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/05/2009 till:01/06/2009 text:May from:01/06/2009 till:01/07/2009 text:June from:01/07/2009 till:01/08/2009 text:July from:01/08/2009 till:01/09/2009 text:August from:01/09/2009 till:01/10/2009 text:September from:01/10/2009 till:01/11/2009 text:October from:01/11/2009 till:01/12/2009 text:November TextData = pos:(570,30) text:"(From the" pos:(617,30) text:"Saffir–Simpson Hurricane Scale)" 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「Timeline of the 2009 Atlantic hurricane season」の詳細全文を読む スポンサード リンク
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