TC Lionrock’s southwestward movement ended when it made a tight cyclonic hairpin turn to the northeast prior to undergoing a strong extratropical transition (ET) as it interacted with an unusually deep and intense baroclinic trough. TC Lionrock’s ET was noteworthy because the storm made a Sandy (2012)-like “left hook” towards Japan as it underwent ET. TC Lionrock’s ET culminated in multiple extreme precipitation events that included a predecessor rain event (PRE) and devastating flooding over parts of eastern Asia in late August 2016.
TC Lionrock’s remarkable life cycle from its initial formation by the TT process to its concluding strong ET and accompanying “left hook” toward Japan presents several science opportunities. These opportunities include: (1) investigating the structure and evolution of monsoon gyre formation and the resulting multiple TC interactions within this gyre, (2) documenting the ET of TC Lionrock and its role in observed extreme precipitation events including the aforementioned PRE over eastern Asia, and (3) determining the cumulative downstream impacts of multiple TC-TC, TC-gyre, and TC-baroclinic trough interactions that culminated in the strong ET of TC Lionrock. These science opportunities motivate our investigation of the remarkable life cycle of TC Lionrock in late August 2016.