The Japan Meteorological Agency issued heat-stroke warning alerts for a record 14 prefectures as temperatures climbed above 35°C in several locations [1].
This surge in extreme heat poses a significant public health risk, as the agency said that the danger of heat-stroke has become extremely high. The scale of the alerts reflects the intensifying severity of summer weather patterns affecting the archipelago.
A strong high-pressure system over the region is driving the temperature increase [2], [3]. By 11 a.m. on July 25, 2024, Hirose in Yamaguchi Prefecture recorded 35.9°C, while Nakamura in Kochi Prefecture reached 35.6°C [1].
Forecasts indicate that the heat will persist or intensify in several hot spots. Hita in Oita is expected to reach a maximum of 38°C [1]. Similarly, Yamaguchi city is forecast to hit 37°C, while other prefectures, including Fukuoka and Kumamoto, are expected to reach 36°C [1].
While the primary alerts focused on western Japan, the heat reached the capital as well. The Tokyo Metropolitan Government issued the first heat-stroke warning alert for Tokyo this year [4].
Local communities have responded with grassroots cooling efforts. One volunteer distributing shaved ice to residents said, "It feels good. The inside of the body becomes cool" [5].
"The danger of heat-stroke becomes extremely high, and this year we have issued heat-stroke warning alerts in 14 prefectures," the Japan Meteorological Agency said [6].
“The danger of heat-stroke becomes extremely high”
The issuance of alerts across 14 prefectures simultaneously indicates a broadening geographical impact of extreme heat events in Japan. The combination of a persistent high-pressure system and record-breaking alert counts suggests that traditional cooling strategies may be insufficient, necessitating more aggressive government interventions to prevent mass heat-related casualties.
