Study for the occurrence and forecasting of strong wind disasters at the surface induced by the downward movement of the high-speed layer in the higher levels

为了分析高空高速层向下运动诱发地面强风的现象，在京都大学防灾研究所Ujigawa开放实验室进行了观测。因此，在近中性条件下，有时主要发生大规模湍流结构，并在地面吹起相应的强风。白天不稳定条件下，上升大尺度结构通过后也观测到地面强风。这些现象是由于高层高速层的动量向下输送造成的。在恶劣的天气中，类似的现象很可能发生。

In order to analyze the phenomena in which strong winds at the surface are induced by the downward movement of the high-speed layer in the higher levels, observations have been made in the Ujigawa Open Laboratory, Disaster Prevention Research Institute, Kyoto University. As a result, in the near-neutral conditions, sometimes large-scale turbulence structures predominantly occur and corresponding strong winds blow at the surface. Strong winds at the surface were also observed after the passage of the ascending large-scale structure in the unstable conditions of the daytime. These phenomena are due to the downward transport of momentum from the high-speed layer in the higher levels. It is likely that similar phenomena are possible in the severe weather.