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Tropical Storm Haiyan (2007)
Tropical Storm Haiyan was a relatively weak and very small tropical cyclone in 2007. Forming west of the International Date Line, Haiyan was operationally considered as an extratropical cyclone by agencies and initially showed subtropical characteristics. Haiyan developed into a tropical storm with an apparent eye on October 5, although JMA operationally upgraded it one day after. The system weakened into a tropical depression on October 6 and dissipated on the next day. Haiyan was initially not recognised by JTWC; however, JTWC regretted and recognised it a tropical storm in post-analysis, as well as JMA claimed that Haiyan was always tropical in the best track data.
==Meteorological history==
A tropical wave formed northeast of Wake Island on September 29, and a tropical depression developed from it late on September 30, which was operationally analysed as an extratropical cyclone by the Japan Meteorological Agency (JMA) on the next day. On October 2, the low-level circulation centre shortly became totally exposed with weak convection; later, the center was gradually covered by deep convection, as the Joint Typhoon Warning Center (JTWC) best track data analysed a subtropical depression developed simultaneously.〔(【引用サイトリンク】url=http://agora.ex.nii.ac.jp/cgi-bin/dt/single2.pl?prefix=MTS107100200&id=200716&basin=wnp&t=0&b=14&lang=en&type=1&size=128 )〕 JTWC indicated that the subtropical depression transformed into a tropical depression at noon on October 3, when deep convection over the system dissipated again.
JTWC analysed the system had intensified into a tropical storm early on October 4. In RSMC best track data, JMA analysed that Haiyan had already intensified into a tropical storm at 00Z on October 5, but the agency operationally reported that the system transitioned into a tropical depression with maximum sustained winds at at 06Z. Both of JMA and JTWC’s best track data indicate that Haiyan reached peak intensity since 06Z, as the storm had already formed a cloud-filled eye.〔Tropical Storm Haiyan 05 oct 2007 0205Z.jpg〕 At noon, JMA began to issue tropical cyclone advisories to Haiyan, expecting it to intensify into a tropical storm within 24 hours.〔
Early on October 6, JMA operationally upgraded the system to a tropical storm and named it ''Haiyan'', but JMA’s post-analysis indicated that Haiyan started to weaken and soon become a tropical depression at 06Z. The agency downgraded Haiyan to a tropical depression operationally late on the same day, as well as JTWC downgraded it to a tropical depression at the same time in best track data. On October 7, Haiyan became totally exposed with a clear low-level circulation centre, and Severe Tropical Storm Podul began to interact with it early on the same day, prompting Haiyan accelerating northwards.〔(【引用サイトリンク】url=http://agora.ex.nii.ac.jp/cgi-bin/dt/single2.pl?prefix=MTS107100700&id=200717&basin=wnp&t=0&b=14&lang=en&type=1&size=128 )〕 Soon, JMA declared that Haiyan had dissipated, and the remnants were later absorbed by the new extratropical cyclone transitioned from Podul. However, JTWC analysed that Haiyan completely dissipated late on October 7.
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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