Niigata Issues Level 4 Landslide Warning for Itoigawa Amidst Critical Rainfall

The Niigata Regional Meteorological Observatory issued a Level 4 Heavy Rain Warning and a Level 4 Landslide Disaster Warning for Itoigawa City at 00:26 on 27 July 2026. The directive follows radar analysis confirming that approximately 100 millimetres of rain fell within a single hour leading up to midnight, a volume that has pushed local infrastructure to its limits.

In conjunction with the local observatory’s alert, the Japan Meteorological Agency classified the precipitation event as a "Recorded Short-Duration Heavy Rain." This specific meteorological classification indicates that rainfall intensity has reached critical levels, necessitating immediate attention from local authorities and residents alike.

Officials have stated that the risk of flooding in low-lying areas and river overflows has become extremely high. The warning explicitly calls for strict vigilance, urging those in affected zones to take immediate safety actions to mitigate the threat of landslides and water damage.

A Level 4 warning signifies a very high risk of landslides, requiring strict vigilance and immediate safety actions. It is important to note that this status remains one level below the highest Level 5, which denotes an imminent life threat and typically triggers emergency evacuation orders.

While previous Level 4 warnings have been issued for other municipalities within Niigata Prefecture, including Nagaoka City, Kashiwazaki City, and Kariwa Village, Niigata City is not currently included in the warning scope. The current alert is specific to Itoigawa, where the concentrated rainfall has created distinct and severe hazards.