As the low-pressure system and a warm front move across Japan, heavy rainfall is anticipated on April 23, 2025, affecting various regions from Kinki to Kanto. The rain is expected to begin in the Kinki region around 7 PM on April 22, and gradually spread to the Tokai region before reaching the Kanto region later.
The Japan Meteorological Agency has issued forecasts indicating that the front will hover over the sea south of Japan, particularly affecting the Kii Peninsula in Wakayama Prefecture. This area is noted for its unique geographical features that facilitate the inflow of moist air, which can lead to the development of low-pressure systems. The current weather conditions suggest that rainfall on the southern side of this low-pressure system could be particularly heavy.
Rainfall simulations predict significant precipitation, with estimates indicating that areas in the southern coastal regions and the mountainous areas of the Kii Peninsula could see substantial amounts of rain. As the system progresses, it is expected to bring cooler temperatures, with the mercury not rising significantly due to the overcast conditions and persistent rain.
In addition to the Kinki region, Eastern and Northern Japan are also bracing for heavy rain on the same day, with the public being advised to stay vigilant for potential downpours. The combination of the low-pressure system and the warm, humid air mass from the south is likely to create conditions for strong rainfall, prompting authorities to warn residents of possible flooding and related hazards.
As of April 22, the Korea Meteorological Administration had also reported similar weather patterns affecting the Korean Peninsula, where heavy rain accompanied by strong winds and gray clouds marked Earth Day. The rainfall, which originated in central regions and provinces like Jeolla and Gyeongbuk, is expected to expand to neighboring areas, particularly impacting the southern coast and Jeju Island.
In Jeju, heavy rain warnings have been issued for mountainous areas, with forecasts predicting rainfall amounts exceeding 100 mm in some regions. The expected rainfall in various areas includes between 20-60 mm in Gwangju and Gyeongnam, and up to 80 mm in specific locations near Mt. Jiri. Winds are also forecasted to reach speeds exceeding 70 km/h, raising concerns about safety and potential damage.
For residents in affected areas, the combination of heavy rain and strong winds necessitates caution, particularly for those in coastal and elevated regions. Authorities are reminding the public to stay updated with weather alerts and take necessary precautions to ensure safety.
Overall, the convergence of meteorological factors suggests that April 23, 2025, will be marked by significant rainfall across a broad swath of Japan, with the potential for localized flooding and disruptions to daily life. The public is urged to remain informed and prepared as this weather system unfolds.
