TBS News caster Inoue Takahiro provided specific safety protocols for citizens facing sudden thunderstorms and heavy rain across Japan this week [1].

These guidelines are critical as extreme heat and humidity have created atmospheric instability, leading to unpredictable and dangerous weather patterns in several regions [2].

Inoue said the primary goal when sensing lightning danger is to seek shelter inside a safe building or vehicle [1]. However, if a secure building is unavailable, individuals should move to a “protection zone” [1].

Inoue said a protection zone is a location at least four meters away from tall objects such as utility poles, chimneys, steel towers, or buildings [1, 2]. To identify this zone, a person should look up at the top of the tall object; the viewing angle must be 45 degrees or greater [1].

Once in a protection zone, the recommended safety posture is to crouch low, cover the ears, and keep the feet together [1, 2].

These warnings follow a period of intense heat. On Thursday, 145 locations across Japan recorded temperatures of 35 °C or higher [2]. The highest temperature was recorded in Kuwana City, Mie, reaching 38.6 °C at 3 p.m. [2].

In Shizuoka, Hamamatsu City experienced three consecutive days where temperatures exceeded 38 °C [2]. This instability triggered sudden heavy rain in the Kanto region, including Atsugi City in Kanagawa around 3 p.m. and Oyama City in Tochigi around 4 p.m. [2].

““If you feel the danger of lightning, the premise is to evacuate to the interior of a safe building or vehicle.””

The convergence of record-breaking heat and sudden electrical storms indicates a volatile weather pattern that increases the risk of lightning strikes. By defining a 'protection zone' with specific measurements and angles, health and safety officials are attempting to reduce casualties in outdoor environments where traditional shelter is absent.