noun
seasonal rain front; Baiu front
Meteorological term for the stationary front that brings the East Asian rainy season (梅雨) in early summer.
梅雨前線が日本列島に停滞している。
The Baiu front is stalled over the Japanese archipelago.
梅雨前線の活動が活
The Baiu front is becoming more active, so caution is needed for heavy rain.