It is recently reported that serious tornado damage has frequently occurred both in Japan and abroad with great social impact. The scenes are still fresh in our memory of the damage inflicted by tornadoes in several Japanese cities, centering on Tsukuba in Ibaragi Prefecture in 2012 (Photo 1) and Koshigaya in Saitama Prefecture in 2013. Meanwhile, it is also true that damage is caused by typhoons, but this damage is liable to be obscured by the scale of the damage caused by tornadoes (Photos 2-3).
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