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The 1998 North Indian Ocean cyclone season was an active season in annual cycle of tropical cyclone formation. The season has no official bounds but cyclones tend to form between April and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. There are two main seas in the North Indian Ocean—the Bay of Bengal to the east of the Indian subcontinent and the Arabian Sea to the west of India. The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories. An average of four to six storms form in the North Indian Ocean every season with peaks in May and November. Cyclones occurring between the meridans 45°E and 100°E are included in the season by the IMD. With eleven depressions and eight tropical cyclones, this was one of the most active seasons in the ocean along with 1987, 1996, and 2005. The season caused a large loss of life, most of which was from one storm. Over 10,000 people were killed in India when Tropical Cyclone 03A brought a 4.9-metre (16 ft) storm surge to the Kathiawar Peninsula, inundating numerous salt mines. Total damages from the storm amounted to Rs. 120 billion (US$3 billion). Tropical Cyclone 01B killed at least 26 people and left at least 4,000 fishermen missing in eastern Bangladesh on May 20. A short lived depression in mid-October killed 122 people after triggering severe flooding in Andhra Pradesh. In November, Tropical Cyclone 06B killed six people and caused property damage worth BTN 880 million (US$20.7 million) in eastern India. An additional 40 people were killed and 100 fishermen were listed as missing after Tropical Cyclone 07B affected Bangladesh. ==Season summary== ImageSize = width:900 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:01/05/1998 till:31/12/1998 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/05/1998 Colors = id:canvas value:gray(0.88) id:GP value:red id:TD value:rgb(0.5,0.8,1) legend:Depression_=_≤51_km/h_(≤31_mph) id:DD value:rgb(0.37,0.73,1) legend:Deep_Depression_=_52–61_km/h_(32–38_mph) id:TS value:rgb(0,0.98,0.96) legend:Cyclonic_Storm_=_62–87_km/h_(39–54_mph) id:ST value:rgb(0.80,1,1) legend:Severe_Cyclonic_Storm_=_88–119_km/h_(55–73_mph) id:VS value:rgb(1,0.76,0.25) legend:Very_Severe_Cyclonic_Storm_=_118–165_km/h_(73–102_mph) id:ES value:rgb(1,0.56,0.13) legend:Extremely_Severe_Cyclonic_Storm_=_166–221_km/h_(103–137_mph) id:SU value:rgb(1,0.38,0.38) legend:Super_Cyclonic_Storm_=_≥222_km/h_(≥138_mph) Backgroundcolors = canvas:canvas BarData = barset:Hurricane bar:Month PlotData= barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till from:17/05/1998 till:20/05/1998 color:ST text:"BOB 01" from:27/05/1998 till:28/05/1998 color:TD text:"ARB 01" from:04/06/1998 till:09/06/1998 color:ES text:"ARB 02" from:13/06/1998 till:15/06/1998 color:TD text:"BOB 01" barset:break from:30/09/1998 till:01/10/1998 color:TD text:"ARB 03" from:06/10/1998 till:09/10/1998 color:TS text:"ARB 04" from:11/10/1998 till:17/10/1998 color:TS text:"ARB 05" from:13/10/1998 till:15/10/1998 color:TD text:"BOB 03" barset:break from:28/10/1998 till:29/10/1998 color:TD text:"BOB 04" from:13/11/1998 till:16/11/1998 color:VS text:"BOB 05" from:17/11/1998 till:23/11/1998 color:VS text:"BOB 06" from:13/12/1998 till:17/12/1998 color:ST text:"ARB 06" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/05/1998 till:01/06/1998 text:May from:01/06/1998 till:01/07/1998 text:June from:01/07/1998 till:01/08/1998 text:July from:01/08/1998 till:01/09/1998 text:August from:01/09/1998 till:01/10/1998 text:September from:01/10/1998 till:01/11/1998 text:October from:01/11/1998 till:01/12/1998 text:November from:01/12/1998 till:31/12/1998 text:December The first storm of the season developed on May 18 out of an area of low pressure over the Bay of Bengal. It reached its peak intensity with winds of 130 km/h (70 mph) before making landfall near Chittagong, Bangladesh. The storm dissipated shortly after.〔 Later that month, a short-lived storm developed over the Arabian Sea and dissipated the next day without impacting land.〔 The most intense storm of the season formed in early June off the southwestern coast of India. It slowly traveled towards the west, remaining relatively weak before turning towards the north and intensifying. The storm reached its peak intensity with winds of 195 km/h (120 mph) shortly before making landfall near Porbandar in the Indian state of Gujarat. The cyclone rapidly dissipated on the same day.〔 After three months of inactivity, five storms developed in late September and October.〔 Two of them strengthened into tropical storms, neither of which impacted land.〔〔 In early November, the sixth tropical cyclone of the season developed in the Bay of Bengal. The storm quickly developed and reached its peak intensity upon landfall with winds of 155 km/h (100 mph). The storm rapidly dissipated the same day it made landfall.〔 Shortly after 06B dissipated, the remnants of Tropical Storm Chip〔 triggered the development of a new cyclone over the Bay of Bengal. The storm tracked along the edge of a subtropical ridge, reaching its peak intensity over open waters with winds of 140 km/h (80 mph). The cyclone entered an area of higher wind shear shortly after and rapidly weakened before making landfall. Then it dissipated in Bangladesh.〔 The final cyclone of the season developed in the Arabian Sea during mid-December. It reached its peak intensity with winds of 120 km/h (75 mph) before weakening due to strong wind shear. It made landfall in Oman on December 17 as a minimal tropical storm shortly before dissipating.〔 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「1998 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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