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Typhoon Atsani (2015)

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Typhoon Atsani was a typhoon that formed in August 2015. The name "Atsani" was named by Thailand and it means Lightning flash.

Meteorological history

Shortly after beginning to track the precursor to Typhoon Goni, the JTWC started to track another tropical disturbance approximately 157 km (100 mi) north-northwest of Wotje Atoll in the Marshall Islands. Deep convection with formative bands surrounding the system's circulation caused both the JMA and the JTWC to upgrade it to a tropical depression, also designating it as 17W on August 14. Later that day, both agencies upgraded 17W to a tropical storm, with the JMA naming it Atsani. On August 16, both agencies upgraded Atsani to a typhoon as it was found in microwave imagery that an eye was developing. Improved convective banding and a ragged eye formed by early the next day. That night, the typhoon's eye became well-defined and the JTWC assessed Atsani's intensity an equivalent to a Category 3 storm. Deepening of convection continued until early on August 18, when the JTWC upgraded Atsani to a Category 4 typhoon. By August 19, very low vertical windshear and excellent radial outflow were in place. A symmetric core and extra feeder bands prompted the JTWC to upgrade it to a super typhoon. Later that day, satellite imagery showed that Atsani was more symmetric and deep with feeder bands wrapping tighter into an expanded 34 nautical-mile diameter eye. Therefore, the JTWC upgraded Atsani further to a Category 5 super typhoon and it attained its peak intensity of 1-minute sustained winds of 260 km/h (160 mph). Atsani moved in a northwestward direction as it was later downgraded to a Category 4 super typhoon intensity on August 20 and at typhoon category later that day as it weakened further. On August 21, satellite imagery indicated that convection over Atsani was decreasing and an eyewall replacement cycle occurred, therefore, the JTWC downgraded Atsani further to a Category 3 typhoon. Vertical windshear started to intensify to a moderate scale and dry air persisted within the north and western part of Atsani and its eyewall began to erode. By the next day, significant dry air prohibited intensification and multispectural satellite imagery indicated a warming in the typhoon's cloud tops prompted the JTWC to downgrade it to a Category 1 typhoon. Atsani maintained that intensity as it started to move in a northeastward direction and began to interact with higher vertical wind shear associated by the mid-latitude baroclinic zone late on August 23. On August 24, both the JMA downgraded Atsani to a severe tropical storm. A few hours later, the JTWC followed suit of downgrading the typhoon to tropical storm strength. The JTWC issued its final warning later that day; During August 25, Atsani became an extra-tropical cyclone, while it was located about 1,650 km (1,025 mi) to the northeast of Tokyo, Japan. The system was subsequently last noted as it dissipated during August 27.

References

  1. デジタル大辞泉プラス. "アッサニーとは". コトバンク (in Japanese). Retrieved 2020-08-20.
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  3. "Significant Tropical Weather Advisory for the Western Pacific Ocean". Joint Typhoon Warning Center. August 12, 2015. Archived from the original on August 14, 2015.
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  22. "STS 1516 ATSANI (1516) DOWNGRADED FROM TY". Japan Meteorological Agency. Archived from the original on August 24, 2015. Retrieved August 24, 2015.
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  24. "Prognostic Reasoning for Tropical Storm 17W (Atsani) Warning 43". Joint Typhoon Warning Center. Archived from the original on August 26, 2015. Retrieved August 24, 2015.
  25. "Typhoon Best Track 2015-10-08T02:00:00Z «  WIS Portal – GISC Tokyo". Retrieved December 14, 2015.
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