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Japan’s weather information platform tenki.jp, operated by the Japan Weather Association, was reported to have faced repeated DDoS (distributed denial-of-service) attacks in early January 2025. Across the source cluster, coverage describes service instability affecting public access to weather updates, especially on the web version, at a time when parts of Japan were facing significant winter conditions.
What happened
According to the reports and official notices referenced in the source set, tenki.jp experienced multiple attack waves around January 5 and January 9, 2025. The attacks reportedly caused network congestion and made parts of the service difficult to use.
The timeline described across sources indicates:
- A first major disruption on January 5.
- Further disruption on January 9, including a temporary recovery followed by another attack later the same day.
- Continued intermittent access problems as of January 10 in some reports.
Coverage also indicates that impact was not identical across channels. The web service was repeatedly described as difficult to access, while users were directed to alternatives such as the app and official social channels for updates. Reports further state that weather information distribution to contracted corporate media clients (such as broadcasters and news organizations) continued without major delivery interruption. Authorities were reportedly consulted regarding the cyber incidents.
Why this matters
For foreigners in Japan, weather information is not just convenience data; it is practical safety infrastructure. Many non-Japanese residents, students, tourists, and short-term workers rely on digital weather platforms to make decisions about commuting, flight and rail changes, mountain and coastal travel, and day-to-day risk during heavy snow, strong wind, or rain.
When a high-traffic weather platform becomes unstable, language and information-access gaps can widen. People who are less familiar with Japanese emergency communication channels may struggle to quickly find equivalent updates elsewhere. That makes service resilience, fallback communication routes, and multilingual information pathways especially important.
This incident also highlights a broader Japan relevance: trusted public-facing services can become vulnerable during peak-demand periods, exactly when reliable access is most critical. For foreign residents and visitors, preparedness now includes knowing backup sources before a disruption happens.
Sources
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