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Updated 30 Jun, 00:00 UTC

Tropical Storm Jangmi brings flood warnings to Tokyo region as evacuations widen

Updated 30 June 2026, 00:00 UTC | TOKYO — Tropical Storm Jangmi brought heavy rain into Japan’s Tokyo region on Wednesday, 3 June, with the Japan Meteorological Agency warning of flooding and AP reporting disruption to roads, flights and trains. Het Nieuwsblad reported evacuation instructions affecting 370,000 people; The Guardian later cited authorities saying 1.52 million people had been advised to evacuate.

Belgium Impulse Editorial·30 June 2026·2 min read·4 sources
Key signal

The immediate risk is flooding in one of the world’s most densely populated urban regions. AP reported that residents near Tokyo’s Zenpukuji River were told to seek shelter, while JMA warnings covered rivers and vulnerable low-lying areas in central and eastern Japan. For readers with travel, family or work links to Japan, the practical point is simple: follow municipal evacuation notices, check train and flight operators, and avoid riverbanks and underpasses during heavy rain.

The subject is Tropical Storm Jangmi, also referred to in Japanese reporting as Typhoon No. 6. According to AP, Jangmi weakened after making landfall in Wakayama prefecture but still carried sustained winds of 90 kph as it moved toward the Tokyo region. The Japan Meteorological Agency is the official weather authority for Japan and the regional typhoon centre for the northwest Pacific.

Background

Japan faces regular tropical cyclones from summer into autumn, but AP and The Guardian both reported that Jangmi’s main danger near Tokyo came from rainfall and swollen rivers rather than only wind. The Guardian said Jangmi had earlier produced record June rainfall in Chiyoda, Tokyo, and damaged homes and infrastructure elsewhere in Japan.

OIS Intelligence

Opposing perspectives

  1. Japanese weather and municipal authorities

    Their priority is early movement away from rivers, low-lying streets and unstable slopes. JMA warnings, as reported by AP, focused on flood danger in central and eastern Japan and urged residents in exposed areas to move to higher ground.

  2. Transport operators and travellers

    Airlines, rail companies and commuters face a different operational pressure: reducing movement while keeping essential routes safe. AP reported hundreds of flight cancellations and delayed or suspended train services as rain disrupted the Tokyo region.

Sources & evidence