Core Points - Japan's Meteorological Agency and Ministry of the Environment issued "heatstroke warnings" for 14 out of 47 prefectures, indicating extremely high risk of heatstroke in these areas [1] - As of 5 PM local time, 123 out of 914 observation points across Japan recorded temperatures exceeding 35 degrees Celsius [1] - The heatwave is expected to persist, with an increase in the number of observation points exceeding 35 degrees Celsius predicted for July 21 [1]