Japan meteorological authorities issued a Level 4 flood-danger warning for the Ishida River on July 18 [1].
The warning indicates a critical risk of river overflow, which may force local municipalities to issue immediate evacuation orders to protect residents in low-lying areas [1], [2].
The Japan Meteorological Agency, acting through the Gunma Prefecture Land Development Department and the Maebashi Local Meteorological Observatory, released the alert at 00:20 JST on July 18 [1]. The Ishida River is part of the larger Tone River system and flows through both Gunma and Saitama prefectures [1], [2].
Officials said that the river water level rose to the designated flood-danger level [1]. This increase in volume significantly raises the probability of inundation in specific urban centers. According to reports, the municipalities most at risk of flooding include Ota City in Gunma Prefecture, and Kumagaya City in Saitama Prefecture [2].
"The Japan Meteorological Agency has announced a 'Level 4 flood danger warning' for the Ishida River of the Tone River system flowing through Gunma Prefecture," ANNnewsCH said [2].
Local government agencies are monitoring the river basins closely to determine if the water levels will stabilize or continue to rise. A Level 4 warning is typically used to signal that the risk of flooding is imminent and that residents should move to safety immediately [1].
"The Gunma Prefecture Land Development Department and the Maebashi Local Meteorological Observatory announced a 'flood danger warning' for the Ishida River of the Tone River system, which spans Gunma and Saitama prefectures, at 0:20 a.m. on the 18th," the Gunma Prefecture Land Development Department and Maebashi Local Meteorological Observatory said [1].
“The warning indicates a critical risk of river overflow”
The issuance of a Level 4 warning reflects a high-confidence prediction of imminent flooding rather than a general weather advisory. Because the Ishida River spans two prefectures, the event requires coordinated emergency responses between Gunma and Saitama authorities to manage potential evacuations in Ota and Kumagaya cities.
