Extreme heat conditions are expected to expand to more than 100 locations across Japan on Tuesday [1].
The rapid expansion of the heat wave poses significant public health risks, prompting officials to issue heat-stroke alerts in 17 prefectures [1].
Weather officials said the surge was due to a strong Pacific high-pressure system. This system is intensifying sunshine and raising temperatures nationwide, particularly from the Kanto region to western Japan [1, 3].
Forecasts for Tuesday indicate severe temperatures in several major cities. Miyazaki and Nagoya are expected to reach a maximum of 37 °C [3]. Meanwhile, Kyoto and Takamatsu are forecast to hit 36 °C [3].
Tokyo is expected to experience its hottest day of the year on Tuesday [1]. Reports on the exact peak temperature for the capital vary. One forecast predicts a maximum of 34 °C [1], while another suggests Tokyo will exceed 35 °C for the first time this year [2].
"14日は東京都心でも今年一番の暑さが予想される," ANNnewsCH said [1].
Local authorities are urging residents to take precautions against heat-stroke as the high-pressure system continues to dominate the region. The alerts in the 17 prefectures serve as a critical warning for vulnerable populations to seek shade, and maintain hydration during the peak afternoon hours [1].
“More than 100 locations face extreme temperatures”
The intensification of the Pacific high-pressure system indicates a volatile summer weather pattern for Japan. The discrepancy in Tokyo's forecast—ranging from 34 °C to over 35 °C—highlights the volatility of urban heat islands during extreme weather events, which can complicate emergency response and public health warnings.
