Event
The Japan Meteorological Agency reported that approximately 100 millimetres of intense rain fell in one hour near Nanto Town, Toyama Prefecture, as of 2:30 am. The agency issued a "recorded short-duration heavy rain" warning due to the imminent danger of disasters.
2 published stories · policy · source reliability 50%
The Japan Meteorological Agency has classified the event as a "Recorded Short-Duration Heavy Rain" warning, citing imminent danger of landslides and flooding in Toyama Prefecture.
Background
The Japan Meteorological Agency (JMA) issued a “Recorded Short-Duration Heavy Rain” warning for Itoigawa City, Niigata Prefecture, after radar analysis confirmed approximately 100 millimetres of rain fell within a single hour leading up to midnight. This intense rainfall has triggered imminent disaster risk warnings. The event occurs against a backdrop of broader weather instability across Japan, with Niigata Prefecture also facing Level 4 Heavy Rain Warnings in other municipalities, including Nagaoka, Kashiwazaki, and Kariwa Village, indicating a very high risk of landslides.
The Japan Meteorological Agency (JMA) issued a “Recorded Short-Duration Heavy Rain” warning for Itoigawa City, Niigata Prefecture, after radar analysis confirmed approximately 100 millimetres of rain fell within a single hour leading up to midnight. This intense rainfall has trig
Fact cards
Key entities: Nanto Town, Toyama Prefecture, Japan Meteorological Agency, Niigata Prefecture, Itoigawa City.
What does the “Recorded Short-Duration Heavy Rain” warning mean? It is a specific JMA alert indicating that rainfall intensity has reached levels historically associated with disasters, prompting immediate safety actions. How much rain fell in Itoigawa? Approximately 100 millimet
Until midnight (27 July 2026): Approximately 100 millimetres of intense rain recorded in a one-hour period near Itoigawa City, Niigata Prefecture. Midnight (27 July 2026): JMA issues “Recorded Short-Duration Heavy Rain” warning due to radar-confirmed rainfall severity and imminen
Timeline
Approximately 100 millimetres of intense rain recorded in a one-hour period near Itoigawa City, Niigata Prefecture.
JMA issues “Recorded Short-Duration Heavy Rain” warning due to radar-confirmed rainfall severity and imminent disaster risk.
Level 4 Heavy Rain Warnings remain in effect for Nagaoka City, Kashiwazaki City, and Kariwa Village in Niigata Prefecture.
FAQ
It is a specific JMA alert indicating that rainfall intensity has reached levels historically associated with disasters, prompting immediate safety actions.
Approximately 100 millimetres of rain fell within a one-hour period ending at midnight.
Yes, Level 4 Heavy Rain Warnings (very high landslide risk) have been issued for Nagaoka City, Kashiwazaki City, and Kariwa Village.
Level 4 indicates a very high risk of landslides requiring strict vigilance, while Level 5 signifies an imminent life threat.