Weather agencies in Japan have issued heatstroke alerts for western regions as dangerous temperatures are forecast for July 8 [1].
These warnings come as the region faces a combination of extreme heat and an approaching storm system, posing significant health and safety risks to millions of residents and travelers.
Most areas in western Japan are expected to experience "manatsubi," or temperatures of 30 °C or higher [1]. In Osaka, the high is forecast to reach 30 °C [1], while Hiroshima is expected to hit 31 °C [1].
The heat is expected to be more severe in Kyushu. Some parts of the region are forecast to see "moshobi," with temperatures reaching 35 °C or higher [1]. Consequently, prefectural governments in Fukuoka, Nagasaki, Kumamoto, and Kagoshima have issued heatstroke alerts [1].
Meteorologists said a warm air mass combined with strong sunshine under a high-pressure system is pushing temperatures above normal levels [2].
While the mainland deals with heat, the Ryukyu Islands are preparing for a separate weather system. Typhoon 9 is expected to approach Okinawa during the weekend of July 10-11 [2].
Reports on the specific storm vary, with some sources identifying the system as Typhoon 9 [2] and others referring to Typhoon 6 [2]. Regardless of the designation, the system is expected to bring heavy rain and high waves to Okinawa and Amami [2].
“Some parts of Kyushu are forecast to see temperatures reaching 35 °C or higher.”
The simultaneous occurrence of a severe heatwave in Kyushu and a typhoon approach in Okinawa places a heavy burden on Japan's emergency infrastructure. The use of specific terminology like 'manatsubi' and 'moshobi' indicates a standardized public health response to trigger cooling center activations and labor adjustments to prevent heat-related deaths.
