Abstract
When the Typhoon Trami (2018) moved northeastward in the Pacific Ocean south of the Kyushu Island at 6:30JST on 30 September 2018, a tornado occurred and caused damages in Kochi city. A funnel cloud also appeared two hour later. Their parent clouds were one of wavy clouds formed more than 500 km apart from the typhoon center. The present study aims to clarify the characteristics and environment of the parent clouds. The results of radar analysis show that the wavy clouds of about 30km in length are arranged parallel to the radial axis of the typhoon and move north-northwestward. The parent clouds have a mesocyclone at its southwest end, but their arrangement is different from the ordinary mini supercells. Then, the mesocyclone repeats alteration of generation. The environment indices, MUCAPE and SREH of in this case are found to be larger and smaller than those of a mini supercell in outer rainband, respectively.
