Japan: Adverse weather forecast across most of the country through at least May 14

Severe weather is forecast across most of Japan through at least May 14. As of May 13, the Japan Meteorological Agency (JMA) has issued the following weather warnings across the affected area:

• Red storm warnings (the middle level on a three-tier scale): Eastern Fukushima, eastern Iwate, and eastern Miyagi prefectures.

• Red high wave warnings: Eastern Kanagawa Prefecture.

• Yellow warnings: Across the rest of the affected area.

Officials will likely issue new alerts or update/rescind existing advisories as weather conditions develop over the coming days.

Forecast models indicate 18 cm (7 inches) of rainfall across the Kanto and Koshin regions as well as the Izu Islands, 13 cm (5 inches) in the Tokai and Tohoku regions, and 8 cm (3 inches) in the Okinawa region through early May 14.

Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rain has saturated the soil. Disruptions to electricity and telecommunications services are likely where significant flooding, landslides, or strong winds impact utility networks.

Floodwaters and debris flows will likely render some bridges, rail networks, or roadways impassable, impacting overland travel around affected areas. Ponding on road surfaces will probably cause hazardous driving conditions on regional highways. Authorities will likely temporarily close some low-lying routes that become inundated by floodwaters.

Severe weather will also probably cause intermittent flight delays and cancellations at airports across the affected region, though these are unlikely to be severe or prolonged. Authorities will likely suspend port operations or close beach fronts temporarily if strong winds trigger hazardous sea conditions. Flooding will probably block regional rail lines; freight and passenger train delays and cancellations are likely in areas with heavy rainfall and potential track inundation. Localized business disruptions are proable in low-lying areas.