Key Facts
• July 1: Intense heat turned into sudden thunderstorms across Kanto-Koshin region.
• Over 100 mm of rain fell in an hour; Tsukuba City roads were flooded.
• Lightning caused power outages and disrupted public transportation systems.
• Ishoka City recorded 120 mm of rain within an hour by 5 PM.
• Tsukuba Express train services were suspended due to lightning-induced power outages.
• Service resumed after an hour, but stations faced crowding and entry restrictions.
• Saitama’s Kawagoe City experienced 38°C heat before thunderstorms struck.
• Lightning and hail were reported in Yamanakako Village and Gunma Prefecture.
• Midori City saw 110 mm of rain in an hour by 5 PM.
• Unstable weather is expected to continue, with warnings for sudden rain and lightning.
Summary
On July 1, the Kanto-Koshin region experienced a dramatic weather shift from extreme heat to severe thunderstorms. Tsukuba City faced road flooding and power outages due to over 100 mm of rain in an hour. Ishoka City recorded 120 mm of rain, while lightning disrupted Tsukuba Express train services, causing delays and crowding. Saitama’s Kawagoe City endured 38°C heat before thunderstorms brought lightning and hail. Midori City also saw 110 mm of rain in an hour. The unstable weather is expected to persist, with warnings for sudden rain and lightning.
