Japan Meteorological Agency fails to issue rainband alerts

The Japan Meteorological Agency reported Tuesday that it was unable to properly issue pre-forecasts and occurrence information for linear precipitation zones ^[1].

This failure is critical because linear precipitation zones—narrow bands of intense rainfall—often trigger catastrophic flash floods and landslides. The inability to warn residents in real-time removes a primary layer of disaster prevention during severe weather events.

The agency said that the disruption affected information releases nationwide, with a specific failure to provide alerts for western Kochi ^[2]. According to the agency, the system failed to issue updates at 5:30 p.m., 7 p.m., and 8 p.m. on June 2 ^[2].

Officials are currently investigating the cause of the malfunction. The agency said it is aiming to determine the cause as quickly as possible, though it added that there is currently no prospect for full recovery ^[3].

In a statement regarding the weather disaster prevention alerts, the agency said, "Information regarding the short-term prediction and occurrence of linear precipitation zones is currently in a state where it is not being appropriately announced" ^[1].

Linear precipitation zones are a primary focus of Japanese meteorological monitoring due to their role in causing extreme flooding. The agency's inability to disseminate this specific data during a period of active monitoring creates a significant gap in the national early warning system. The agency said it continues to investigate whether the issue is software-related or a broader infrastructure failure ^[1].