The Japan Meteorological Agency said Sunday morning that the northern Tohoku region has officially entered the rainy season [1].
The arrival of the rainy season brings critical implications for agriculture and public safety in northern Japan. With the transition to wetter weather, officials are warning of significant flood risks and geological instability in mountainous areas.
According to the agency, this year's onset is six days later than average [2] and two days earlier than last year [2]. The shift is attributed to the influence of the rainy season front, which is expected to bring persistent cloudy skies and rain to the region.
Weather officials have issued warnings regarding the intensity of the upcoming precipitation. The agency said that some areas may experience heavy rain exceeding a typical month's worth of precipitation [3]. This volume of water increases the risk of river flooding, and landslides.
"Because there are places where heavy rain exceeding the average for one month will occur, vigilance is necessary for sediment disasters and rising rivers," the Japan Meteorological Agency said [3].
Residents in the northern Tohoku region are advised to monitor local weather updates closely. The agency said that the rainy season front will likely maintain its position, ensuring that wet conditions continue for the foreseeable future [1].
“this year's onset is six days later than average”
The delayed start of the rainy season in northern Tohoku can disrupt traditional planting and harvesting schedules for local farmers. More critically, the forecast of a month's worth of rain falling in a short window suggests a high risk of flash flooding and landslides, which often occur when saturated soil cannot absorb sudden, intense precipitation.
