Graphical Abstract

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Takamura, N., and A. Wada, 2020: Unusual characteristics of extratropical transition of typhoons in August 2016. J. Meteor. Soc. Japan, 98, 691-706.
https://doi.org/10.2151/jmsj.2020-035
Graphical Abstract

Plain Language Summary: To identify the unusual characteristics such as frequent landfall and extratropical transition in August 2016, this study examines typhoons in August and September by conducting k-means cluster, cyclone phase space and composite analyses and case study. We also compare the results of the analyses for this period with those in August from 2001 to 2015 and those in September 2016. As a result, the synoptic environments around the typhoons explain the unusual track and the frequent extratropical transition in August 2016.

Highlights:

• The direction of the typhoon tracks in August 2016 is northward.
• Extratropical transition in August 2016 is characterized by an indistinct structural change from a warm-core structure to a cold-core structure.
• The synoptic environments around the typhoons in August 2016 are characterized by enhanced undulations of the upper-tropospheric jet stream, increased amplitudes of the mid-tropospheric trough, and relatively warm air around the typhoons in the lower troposphere.