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Cyclone Helen (2013)
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Cyclone Helen (2013) : ウィキペディア英語版
Cyclone Helen (2013)

Cyclonic Storm Helen is a relatively weak tropical cyclone that formed in the Bay of Bengal Region on November 18, from the remnants of Tropical Storm Podul. It was classified as Deep Depression BOB 06 by the IMD on November 19. As it was moving on a very slow northwest direction on November 20, it became Cyclonic Storm Helen as it brought light to heavy rainfall in eastern India. It then became a Severe Cyclonic Storm on the afternoon hours of November 21.
==Meteorological history==

Late on November 17, the remnant energy of Tropical Storm Podul contributed to the development of a trough over the Bay of Bengal, located near the Andaman Islands. During the next couple of days, the storm slowly organized and consolidated, prompting the Joint Typhoon Warning Center (JTWC) to issue a Tropical cyclone formation alert (TCFA) during the early hours of November 19. Later on the same day, the India Meteorological Department (IMD) upgraded the storm to a depression, classifying it as ''BOB 06'', followed by the JTWC reporting that the storm had reached Tropical Storm strength. A couple of hours later, the IMD upgraded BOB 06 into a Deep Depression, as the storm continued to intensify.〔(【引用サイトリンク】url=http://www.webcitation.org/6LGKlVuUN )
The storm slowly drifted west-northwestward, while deep convection consolidated around the system's well-defined center of circulation.〔(【引用サイトリンク】url=http://www.webcitation.org/6LGTiqEn8 )〕 In the early hours of November 20, the IMD classified BOB 06 as a Cyclonic Storm, thereby officially naming it ''Helen''.〔(【引用サイトリンク】url=http://www.webcitation.org/6LGTd3v8u )〕 Early on November 21, Helen continued to intensify into a Severe Cyclonic Storm, reaching its peak intensity of with a central pressure of .
Shortly before landfall, the storm's convection sheared to the north, causing its low level circulation to fully expose followed by the JTWC issuing its final bulletin, reporting that the storm had weakened due to land interaction. Helen made landfall south of Machilipatnam, Andhra Pradesh and rapidly deteriorated into a deep depression.〔(【引用サイトリンク】title=Severe Cyclonic Storm Helen Warning Bulletin 27 for the Indian coast, issued at 1900 IST (1330 UTC), 22 November 2013 )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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