Doyo Wave - Doyonami

Japanese: 土用波 - どようなみ
Doyo Wave - Doyonami
This refers to the big waves that wash up on the coast on windless days during the summer Doyo period (the 18 days before the beginning of autumn). These are swells caused by typhoons far out at sea that often occur around this time, but in the past when there was no weather observation or forecasting system, Doyo waves were greatly feared and people were wary of them. (Nagata)

Source: Japan Hydrographic Association, Ocean Information Research Center, Encyclopedia of the Sea

Japanese:
夏の土用(立秋の前18日間)の頃、風の無い日に海岸に打ち寄せる大波をいう。この頃にしばしば発生する洋上遥かにある台風によって起こされたうねりであ るが、気象の観測・予報体制の無かった昔には、土用波は非常に恐れられ、警戒された。 (永田)

出典 (財)日本水路協会 海洋情報研究センター海の事典について 情報

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