Cloud image analysis of the 2019 Nobeoka tornado

Abstract

A tornado occurred in Nobeoka, Miyazaki on the morning of September 22, 2019, when the typhoon No.17 was approaching. About 500 houses were broken and 18 peoples were injured by the tornado. The present study aims to clarify the characteristics of the tornado. Its funnel cloud was wide bowl shape and it was difficult to identify the tornado. But its moving velocity was found to be 96 m/s. And the maximum velocity, 43 ? 52 m/s, was estimated by the drop level of cloud bottom. Furthermore, we will report the result of the trial identifying the tornado with the rotating motion of the cloud.