Japan Meteorological Association: Japan DDoS Cases 2025
Feb. 26, 2025
Japan Meteorological Association: Japan DDoS Cases 2025
On January 9, 2025, the Japan Meteorological Association's weather forecasting site "tenki.jp" suffered a large-scale DDoS (Distributed Denial-of-Service) attack, resulting in severe access disruptions.
The web version was particularly affected, experiencing multiple outages, with the impact lasting until January 15. The attack occurred at a critical time when heavy snow and blizzards were being warned, particularly along the Japan Sea coast, affecting many users seeking weather updates.
In response, the Japan Meteorological Association has been working closely with the Metropolitan Police Department to prevent further damage and mitigate the impact of the attack.
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事象
Japan Meteorological Association: Japan DDoS Cases 2025
On January 9, 2025, the Japan Meteorological Association's weather media site "tenki.jp" was targeted by an external DDoS (Distributed Denial-of-Service) attack, causing the following disruptions:
Incident Timeline and Impact
- January 9, 7:01 AM – 4:30 PM: The web version of "tenki.jp" experienced intermittent accessibility issues.
- January 9, 8:42 PM – January 10, 4:30 PM: A second wave of access disruptions affected the web version.
- January 15, 7:51 AM – January 17, 3:00 AM: Similar disruptions continued.
These outages were attributed to network congestion caused by the DDoS attack.
Affected Services
- Web version of "tenki.jp"
- Some functions of the "tenki.jp" mobile app
However, the entire app version and the official X (formerly Twitter) account remained operational and continued to provide weather updates.
Response Measures
The Japan Meteorological Association successfully restored services following the first attack on January 9, but was hit again in the evening, leading to prolonged disruptions. The association has since consulted with the Cyber Crime Division of the Metropolitan Police Department to share details of the attack and prevent further cyber threats.
Context and Background
During this period, heavy snow, blizzards, and high waves were predicted, particularly along the Japan Sea coast, increasing public demand for weather updates. Given the critical nature of this information, the association is working diligently toward a full recovery of services.
User Recommendations
Users are advised to check weather updates through the mobile app or the official X account as alternative sources.
Sources:
🔗 tenki.jp Feature Article
🔗 Japan Meteorological Association News
