Disaster Prevention System ZEROSAI - Centralized Management of Weather Information for Construction Projects

On November 11, 2025, a proposal to revise the "Disaster Prevention Meteorological Information" concerning floods, heavy rain, landslides, and storm surges was approved by the Cabinet. The implementation is scheduled for the rainy season in 2026. This article will explain what disaster prevention meteorological information is, the issues with the current system, and how the new disaster prevention meteorological information will change. Table of Contents 1. What is disaster prevention meteorological information? 2. Issues with the current disaster prevention meteorological information 3. How will the new disaster prevention meteorological information change? 1. What is disaster prevention meteorological information? Disaster prevention meteorological information refers to information related to disaster risks announced by the Japan Meteorological Agency. It is issued when the risk of disasters such as heavy rain, floods, strong winds, lightning, storm surges, and landslides increases, serving as a basis for decisions on evacuation and work suspension. Specifically, it includes alerts and warnings such as "Special Heavy Rain Warning," "Landslide Warning," and "Storm Surge Advisory," which are denoted by the suffixes "warning" or "advisory." It also encompasses various other information, such as "Meteorological Information on Significant Heavy Rain" that alerts to the risk of linearly organized precipitation bands, "Heat Stroke Warning Alerts" during summer, and "Typhoon Information." 2. Issues with the current disaster prevention meteorological information For details, please visit our website.

The Japan Meteorological Agency announced a three-month forecast from December to February on Tuesday, November 25. During this period, the upper-level westerly winds will meander southward near Japan, but will generally flow in the same position as the average year. For more details, please visit our website.

On October 21 (Tuesday), the Japan Meteorological Agency announced the three-month forecast from November to January. In November, temperatures are expected to be higher than average nationwide, as the westerly winds will flow north of Japan, making it less susceptible to cold air influences. For more details, please visit our website.

On Monday, September 22, the Japan Meteorological Agency announced its three-month forecast for October to December. Due to the continued influence of conditions similar to the La Niña phenomenon until around December, the westerly winds are expected to flow more to the north than usual from October to early November, making it likely that warm air will cover the entire country. From late November to December, the westerly winds are expected to meander southward near Japan, and there may be periods when the winter pressure pattern strengthens. In December, the region is likely to be affected by cold air, and temperatures in western and eastern Japan are expected to be around or lower than the average for the season. For more details, please visit our website.