|
The 1974 Pacific hurricane season featured one of the most active periods of tropical cyclones on record with five storms existing simultaneously.〔 The season officially started May 15 in the eastern Pacific, and June 1 in the central Pacific, and lasted until November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeast Pacific Ocean. With seventeen storms, this season was slightly above average. At eleven, the number of hurricanes was also above average. In the central Pacific, one tropical storm formed. Very unusually, on August 26 there were six systems active: Ione, Olive, Kirsten, Lorraine, Joyce, and Maggie. Olive was a Central Pacific storm and had weakened to a tropical depression by this time. The other five were of at least tropical storm intensity simultaneously and remained so until 06Z Aug 27. Five storms were also active 18Z Aug 23-06Z Aug 24. ==Season summary== ImageSize = width:800 height:230 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:01/05/1974 till:01/12/1974 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/05/1974 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_(0-62_km/h) id:TS value:rgb(0,0.98,0.96) legend:Tropical_Storm_=_39-73_mph_(63-117 km/h) id:C1 value:rgb(1,1,0.80) legend:Category_1_=_74-95_mph_(119-153_km/h) id:C2 value:rgb(1,0.91,0.46) legend:Category_2_=_96-110_mph_(154-177_km/h) id:C3 value:rgb(1,0.76,0.25) legend:Category_3_=_111-130_mph_(178-209-km/h) id:C4 value:rgb(1,0.56,0.13) legend:Category_4_=_131-155_mph_(210-249_km/h) id:C5 value:rgb(1,0.38,0.38) legend:Category_5_=_>=156_mph_(>=250_km/h) Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:11 align:left fontsize:S shift:(4,-4) anchor:till from:28/05/1974 till:30/05/1974 color:TS text:"Aletta" from:05/06/1974 till:08/06/1974 color:TS text:"Blanca" from:07/06/1974 till:22/06/1974 color:C3 text:"Connie" from:14/06/1974 till:17/06/1974 color:C1 text:"Dolores" from:30/06/1974 till:03/07/1974 color:TS text:"Eileen" from:09/07/1974 till:13/07/1974 color:TD text:"TD" from:14/07/1974 till:19/07/1974 color:C1 text:"Francesca" from:17/07/1974 till:21/07/1974 color:C2 text:"Gretchen" from:18/07/1974 till:20/07/1974 color:TD text:"TD" barset:break from:21/07/1974 till:26/07/1974 color:TD text:"TD" from:30/07/1974 till:11/08/1974 color:TD text:"TD" from:05/08/1974 till:07/08/1974 color:TD text:"TD" from:10/08/1974 till:13/08/1974 color:TS text:"Helga" from:20/08/1974 till:30/08/1974 color:C3 text:"Ione" from:22/08/1974 till:26/08/1974 color:TS text:"Olive" from:22/08/1974 till:27/08/1974 color:C1 text:"Joyce" from:22/08/1974 till:29/08/1974 color:C1 text:"Kirsten" from:23/08/1974 till:28/08/1974 color:TS text:"Lorraine" barset:break from:26/08/1974 till:01/09/1974 color:C4 text:"Maggie" from:03/09/1974 till:07/09/1974 color:TD text:"TD" from:09/09/1974 till:10/09/1974 color:C1 text:"Norma" from:21/09/1974 till:24/09/1974 color:C2 text:"Orlene" from:04/10/1974 till:15/10/1974 color:C1 text:"Patricia" from:14/10/1974 till:15/10/1974 color:TD text:"TD" from:21/10/1974 till:24/10/1974 color:TS text:"Rosalie" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/05/1974 till:01/06/1974 text:May from:01/06/1974 till:01/07/1974 text:June from:01/07/1974 till:01/08/1974 text:July from:01/08/1974 till:01/09/1974 text:August from:01/09/1974 till:01/10/1974 text:September from:01/10/1974 till:01/11/1974 text:October from:01/11/1974 till:01/12/1974 text:November TextData = pos:(570,30) text:"(From the" pos:(617,30) text:"Saffir-Simpson Hurricane Scale)" The overall activity of the 1974 season was near normal, with 25 tropical cyclones developing. Of these storms, 18 were named, 11 became hurricanes and 3 reached major hurricane status. Although the overall number of storms was normal, an exceptionally active period took place from August 19 through September 1. During this two-week span, six storms developed, five of which were active simultaneously on August 23: Ione, Joyce, Kirsten, Lorraine and Olive. Of the season's 447 bulletins, 139 were issued during this period.〔 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「1974 Pacific hurricane season」の詳細全文を読む スポンサード リンク
|