1.
seasonal rain front; baiu front; rainy season front
The stationary weather front that brings Japan's rainy season, typically stretching across the country from June to mid-July as warm and cool air masses collide.
Due to the influence of the rainy season front, western Japan is expected to see heavy rain.
A compound of 梅雨 (the rainy season) and 前線 (weather front). This is a key meteorological term that appears constantly in Japanese weather forecasts from late May through July.
The 梅雨前線 forms where the warm, moist air mass from the Pacific (小笠原気団) meets the cool air from the north. It typically begins affecting Okinawa in May, gradually moves northward through Kyushu, Shikoku, and Honshu during June, and reaches the Tohoku region in July. When the front finally moves off the coast, it marks the end of the rainy season (梅雨明け).
Common collocations
- 梅雨前線が停滞する: the rainy season front stagnates
- 梅雨前線が活発化する: the rainy season front becomes active
- 梅雨前線の影響: influence of the rainy season front
- 梅雨前線が北上する: the rainy season front moves northward