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The 1989 Pacific typhoon season has no official bounds; it ran year-round in 1989, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November.〔Gary Padgett. (May 2003 Tropical Cyclone Summary. ) Retrieved 2006-08-26.〕 These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. Tropical Storms forming in the Western Pacific basin were assigned a name by the Joint Typhoon Warning Center. Tropical depressions that enter or form in the Philippine area of responsibility are assigned a name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration or PAGASA. This can often result in the same storm having two names. ==Season summary== ImageSize = width:990 height:240 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:01/01/1989 till:31/12/1989 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/01/1989 Colors = id:canvas value:gray(0.88) id:GP value:red id:TD value:rgb(0.38,0.73,1) legend:Tropical_Depression_=_≤61_km/h_(≤38_mph) id:TS value:rgb(0,0.98,0.96) legend:Tropical_Storm_=_62_–_88_km/h_(39_–_54_mph) id:ST value:rgb(0.80,1,1) legend:Severe_Tropical_Storm_=_89_–_117_km/h_(55_–_72_mph) id:TY value:rgb(0.99,0.69,0.6) legend:Typhoon_=_≥118_km/h_(≥73_mph) Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till from:15/01/1989 till:21/01/1989 color:TS text:"Winona" from:26/01/1989 till:28/01/1989 color:TD text:"Atring" from:17/04/1989 till:25/04/1989 color:TY text:"Andy" from:14/05/1989 till:21/05/1989 color:TY text:"Brenda" from:21/05/1989 till:26/05/1989 color:ST text:"Cecil" from:02/06/1989 till:12/06/1989 color:TY text:"Dot" from:18/06/1989 till:21/06/1989 color:ST text:"Ellis" from:24/06/1989 till:27/06/1989 color:TD text:"TD" from:06/07/1989 till:11/07/1989 color:ST text:"Faye" from:09/07/1989 till:19/07/1989 color:TY text:"Gordon" from:16/07/1989 till:21/07/1989 color:TS text:"Hope" barset:break from:18/07/1989 till:24/07/1989 color:ST text:"Irving" from:20/07/1989 till:29/07/1989 color:TY text:"Judy" from:27/07/1989 till:31/07/1989 color:TD text:"Miling" from:29/07/1989 till:07/08/1989 color:ST text:"Ken–Lola" from:30/07/1989 till:08/08/1989 color:TY text:"Mac" from:09/08/1989 till:12/08/1989 color:TD text:"TD" from:11/08/1989 till:16/08/1989 color:TY text:"Nancy" from:11/08/1989 till:18/08/1989 color:TY text:"Owen" from:16/08/1989 till:18/08/1989 color:TS text:"Peggy" from:16/08/1989 till:19/08/1989 color:TD text:"19W" from:18/08/1989 till:22/08/1989 color:TD text:"TD" barset:break from:19/08/1989 till:23/08/1989 color:TD text:"TD" from:24/08/1989 till:28/08/1989 color:ST text:"Roger" from:24/08/1989 till:28/08/1989 color:TS text:"21W" from:03/09/1989 till:14/09/1989 color:TY text:"Sarah" from:08/09/1989 till:14/09/1989 color:ST text:"Tip" from:11/09/1989 till:16/09/1989 color:ST text:"Vera" from:16/09/1989 till:20/09/1989 color:TY text:"Wayne" from:28/09/1989 till:10/10/1989 color:TY text:"Angela" from:28/09/1989 till:03/10/1989 color:TY text:"Brian" from:01/10/1989 till:08/10/1989 color:TY text:"Colleen" from:06/10/1989 till:13/10/1989 color:TY text:"Dan" barset:break from:13/10/1989 till:22/10/1989 color:TY text:"Elsie" from:18/10/1989 till:30/10/1989 color:TY text:"Forrest" from:01/11/1989 till:04/11/1989 color:TY text:"Gay" from:16/11/1989 till:23/11/1989 color:TY text:"Hunt" from:21/11/1989 till:04/12/1989 color:TY text:"Irma" from:04/12/1989 till:09/12/1989 color:TD text:"35W" from:05/12/1989 till:06/12/1989 color:TD text:"TD" from:08/12/1989 till:09/12/1989 color:TD text:"TD" from:21/12/1989 till:28/12/1989 color:TY text:"Jack" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/01/1989 till:31/01/1989 text:January from:01/02/1989 till:28/02/1989 text:February from:01/03/1989 till:31/03/1989 text:March from:01/04/1989 till:30/04/1989 text:April from:01/05/1989 till:31/05/1989 text:May from:01/06/1989 till:30/06/1989 text:June from:01/07/1989 till:31/07/1989 text:July from:01/08/1989 till:31/08/1989 text:August from:01/09/1989 till:30/09/1989 text:September from:01/10/1989 till:31/10/1989 text:October from:01/11/1989 till:30/11/1989 text:November from:01/12/1989 till:31/12/1989 text:December Throughout 1989, several large-scale factors across the western Pacific Ocean displaced unusual characteristics that presented unique difficulties to forecasters. In their annual tropical cyclone report for 1989, the Joint Typhoon Warning Center regarded the season as one of the most challenging and unique years in their history. During much of the year, a very broad monsoon trough was present and resulted in significant diurnal fluctuations in convective activity that inhibited rapid development of many disturbances. The mid-tropospheric ridge was unusually narrow and led to difficulties in forecasting straight-running storms. Additionally, the Tropical Upper Tropospheric Trough (TUTT) had a major role in the development of many systems, most notably Typhoon Gordon which formed from a single thunderstorm underneath a TUTT cell. The season began with the unusual development of Tropical Storm Winona east of the International Dateline in early January. Remaining active for two weeks, the system crossed the basin before dissipating over the Philippines. Following a three month lull in activity, a powerful typhoon developed in mid-April and was the second system in nine years to become a super typhoon during that month. By mid-May, an extensive monsoon trough had become established from the Bay of Bengal eastward into the South China Sea. Typhoon Brenda developed from this trough over the South China Sea and moved inland over southern China before dissipating. The typhoon left an area of enhanced low-level southerly flow in its wake that triggered the development of Typhoon Cecil at the end of the month. Two more storms developed during June – Typhoon Dot and Tropical Storm Ellis. The first was a strong typhoon that developed near the Caroline Islands and moved westward, eventually dissipating over Vietnam. The second was a poorly organized system that moved generally northward and struck Japan.〔 In early July, a surge in the monsoon trough over the basin resulted in the development of Tropical Storm Faye. While this system was over the Philippines, Typhoon Gordon developed underneath a TUTT cell to the east. Following Gordon's rapid intensification phase, a new tropical storm developed within an area of enhanced divergence associated with the same TUTT cell. Several days later, the monsoon trough became exceptionally active and spawned several consecutive cyclones in late-July: Irving over the South China Sea, Judy near the Mariana Islands, 12W near Taiwan, and Ken–Lola around the Ryukyu Islands. The development of seven tropical cyclones in July made it the most active July since 1973. The extreme activity continued into August with the formations of Mac, Nancy, Owen, Peggy, and 19W, all of which formed within the monsoon trough. The rapid succession of Nancy, Owen, and Peggy led to several days of binary interaction between the systems well to the south of Japan. Tropical Storm Roger developed near the Ryukyu Islands a few days after 19W dissipated and rapidly tracked northeastward through Japan. This was the only storm of the month not to develop within the monsoon trough. The final system of August, 21W, developed to the northeast of Guam and dissipated due to strong wind shear.〔 Heavy rains alongside several typhoons between June and September resulted in deadly flooding across parts of Anhui, Hebei, Hubei, Jiangsu, Jiangxi, Jilin, Sichuan, and Zhejiang provinces in China. The floods killed approximately 3,000 people and overall losses reached $2.7 billion. 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「1989 Pacific typhoon season」の詳細全文を読む スポンサード リンク
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