Japan's weather forecasters said the rainy-season front is approaching, potentially bringing the start of the season to Hokuriku and Tohoku this week [1].
The shift in weather patterns is critical for agricultural planning and disaster prevention as the country prepares for the seasonal increase in precipitation and potential flooding.
According to reports from TBS News Dig, a weather front is expected to stall over Honshu [1]. This meteorological setup, combined with a high-pressure system, is transporting moist air toward western Japan [2]. Forecasters said that rain is possible tomorrow, Tuesday, in Kyushu and Shikoku [1]. Specifically, rain is expected to begin in the morning for Kyushu and around noon for Shikoku [1].
While western regions face rain, much of the rest of the country is expected to remain sunny [1]. Temperature forecasts for the region vary by city. Sapporo is expected to reach a high of 25°C [1], while Kushiro is forecast at 16°C [1]. In the north, Aomori is expected to reach 24°C and Morioka 29°C [1].
Some regions are moving in the opposite direction of the seasonal cycle. Okinawa is currently close to the end of its rainy season [1].
Forecasters said that the timing of these events can fluctuate. Some reports suggest that mid-June will see a continuation of high temperatures, with multiple locations forecast to exceed 30°C [3]. Other projections indicate that widespread rain across Honshu may not occur until later in the month, specifically around June 27 and 28, before clearing again on June 29 [4].
Despite these variations, the primary concern remains the movement of the rainy-season front. Weather services continue to monitor the potential for heavy rainfall and the formation of linear precipitation zones, which can lead to severe flooding in prefectures such as Kagoshima [5].
“Hokuriku and Tohoku may enter the rainy season this week.”
The stalling of a rainy-season front over Honshu indicates a period of atmospheric instability that can lead to prolonged precipitation. When these fronts remain stationary, the risk of localized flooding and landslides increases, necessitating heightened vigilance from municipal authorities and residents in the affected western and northern regions.
