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The 1999 Pacific hurricane season was one of the least active Pacific hurricane seasons on record. The season officially began on May 15 in the Eastern Pacific, and on June 1 in the Central Pacific; in both basins, it ended on November 30. These dates conventionally delimit the period during which most tropical cyclones form in the northeastern Pacific Ocean. The first tropical cyclone of the season, Hurricane Adrian, developed on June 18, while the final storm of the season, Tropical Storm Irwin, dissipated on October 11. No storms developed in the Central Pacific during the season. However, two storms from the Eastern Pacific, Dora and Eugene, entered the basin, with the former entering as a hurricane. The season produced fourteen tropical cyclones and nine named storms, which was well below the average of sixteen named storms per season; this was largely due to a strong La Niña taking over much of the Pacific. However, the total of six hurricanes and two major hurricanes during the season was near the averages of eight and three, respectively. Although it remained offshore, Hurricane Adrian caused 6 deaths from flooding and rough surf in Mexico. Hurricane Dora was a long-lived and intense cyclone, which had the second longest track of a Pacific hurricane on record. The storm brought minor impacts to the island of Hawaii; however, no deaths or damage was reported. The deadliest tropical cyclone, Hurricane Greg, killed 10 people from flooding in Mexico. ==Season summary== 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:01/06/1999 till:01/12/1999 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/06/1999 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)_(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:10 align:left fontsize:S shift:(4,-4) anchor:till from:18/06/1999 till:22/06/1999 color:C2 text:"Adrian (C2)" from:09/07/1999 till:17/07/1999 color:C3 text:"Beatriz (C3)" from:14/07/1999 till:15/07/1999 color:TD text:"Three-E (TD)" from:23/07/1999 till:25/07/1999 color:TD text:"Four-E (TD)" from:25/07/1999 till:27/07/1999 color:TS text:"Calvin (TS)" from:26/07/1999 till:28/07/1999 color:TD text:"Six-E (TD)" barset:break from:06/08/1999 till:20/08/1999 color:C4 text:"Dora (C4)" from:06/08/1999 till:15/08/1999 color:C2 text:"Eugene (C2)" from:13/08/1999 till:15/08/1999 color:TD text:"Nine-E (TD)" from:17/08/1999 till:22/08/1999 color:TS text:"Fernanda (TS)" from:23/08/1999 till:24/08/1999 color:TD text:"Eleven-E (TD)" from:05/09/1999 till:09/09/1999 color:C1 text:"Greg (C1)" barset:break from:17/09/1999 till:21/09/1999 color:C1 text:"Hilary (C1)" from:08/10/1999 till:11/10/1999 color:TS text:"Irwin (TS)" bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/06/1999 till:01/07/1999 text:June from:01/07/1999 till:01/08/1999 text:July from:01/08/1999 till:01/09/1999 text:August from:01/09/1999 till:01/10/1999 text:September from:01/10/1999 till:01/11/1999 text:October from:01/11/1999 till:01/12/1999 text:November The 1999 Pacific hurricane season officially started on May 15, 1999 in the eastern Pacific, and on June 1, 1999 in the central Pacific, and lasted until November 30, 1999. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean. The 1999 Pacific hurricane season was well below average, due to the strong La Niña that was occurring at the time, which causes wind shear to be increased and water temperatures to decrease, resulting in conditions less conductive for tropical cyclones in the East Pacific. There were 14 cyclones in total, including 5 unnamed tropical depressions. Of these, 9 became a tropical storm, while 6 reached hurricane status. Further, 2 of these became major hurricanes, which is Category 3 intensity or higher on the Saffir-Simpson hurricane scale. Tropical cyclogenesis began with Hurricane Adrian, which developed on June 18. Although it remained offshore, Adrian brought rough surf and flooding to Mexico, which resulted in 6 fatalities. The storm peaked as a Category 2 before dissipating on June 22. No other tropical cyclones formed in June. Activity halted until July 9, when Hurricane Beatriz developed. Though it peaked as a Category 3 hurricane before dissipating on July 17, the storm caused no damage on land because it remained well offshore. The next system, a short-lived Tropical Depression Three-E, did not result in impact as a tropical cyclone,〔 though the precursor brought heavy rainfall and gusty winds to Central America.〔〔 Tropical Depression Four-E, was the first of three cyclones to cross into the Central Pacific Hurricane Center's area of responsibility, which is between 140°W and the International Date Line.〔 Two other short-lived system in July, Tropical Storm Calvin and Tropical Depression Six-E, caused no damage.〔 In August, Hurricane Dora, the strongest storm of the 1999 Pacific hurricane season,〔 produced gusty winds and large waves on Johnston Atoll and the island of Hawaii, though minimal damage was left in its wake.〔 After crossing the International Date Line on August 20, Dora became the first tropical cyclones to exist in all three basins of the North Pacific – Eastern, Central, and Western – since Hurricane John in 1994.〔 Hurricane Eugene also existed in the Eastern and Central Pacific, but dissipated on August 15 while south of the main Hawaiian Islands, well before reaching the International Date Line. Nonetheless, it produced up to of rainfall on the Big Island of Hawaii.〔 In the remainder of August, there was a series of short-lived tropical cyclones that did not effect land, including Tropical Depression Nine-E, Tropical Storm Fernanda, and Tropical Depression Eleven-E.〔 During the month of September, the deadliest tropical cyclone of the season, Hurricane Greg, was spawned near the Pacific coast of Mexico.〔 Greg which killed 10 people when it made landfall on southern Baja California.〔〔 The hurricane and its precursor produced heavy rainfall across much of Mexico, with the highest total reaching 22.23 in (566.9 mm).〔 The heavy rains damaged or destroyed more than 2,000 homes.〔 The remnant moisture from the system, combined with an area of low pressure, resulted in strong thunderstorms across California, which led to numerous power outages, damage to homes and vehicles, and started many wildfires.〔〔〔 The other in the month of September was Hurricane Hilary, a storm that approached Baja California, but dissipated offshore on September 21, resulting in no impact.〔 The final system, Tropical Storm Irwin, produced scattered areas of heavy rainfall over Mexico in October,〔 but caused no significant flooding.〔 It dissipated on October 11,〔 over a month and a half before the official end of the season on November 30.〔 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「1999 Pacific hurricane season」の詳細全文を読む スポンサード リンク
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