10 Jul 2023 | 02:38 AM UTC
Japan: Severe weather forecast to continue across western regions through at least July 11 /update 1
Severe weather forecast to continue across western Japan through at least July 11. Evacuations and weather-related disruptions ongoing.
Event
Severe weather is forecast to continue across western Japan through at least early July 11. As of July 10, the Japan Meteorological Agency (JMA) has issued black heavy rain emergency warnings (the highest level on a four-tier scale) for parts of Fukuoka and Oita prefectures. Purple storm surge and landslide, and red storm surge warnings are in place for the rest of the affected area. Authorities forecast rainfall totals of up to 20 cm (8 inches) are likely in the northern Kyushu region until at least early July 11. Parts of Kyushu Region have experienced heavy rainfall since June 28, and areas, where the ground is already saturated, will be highly susceptible to further flooding. Authorities will almost certainly issue new alerts or update/rescind existing advisories as weather conditions develop over the coming days.
Disruptions are ongoing across parts of northern Kyushu due to severe weather that has impacted the region in recent days. Authorities have issued evacuation orders for thousands of people in the affected area as of July 10. The adverse weather has reportedly killed at least one person in Fukuoka Prefecture, with a few others missing in Saga Prefecture. The downpour has suspended bullet train service between Hiroshima and Fukuoka's Hakata stations as of July 10.
Hazardous Conditions
Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also likely in developed areas with easily overwhelmed stormwater drainage systems. Sites located downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are likely in hilly or mountainous areas, especially where heavy rainfall has saturated the soil.
Authorities could issue additional evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are likely where significant flooding or landslides impact utility networks.
Transport
Floodwaters and debris flows will likely render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.
Severe weather could also trigger flight delays and cancellations at airports in the affected areas. Flooding could block regional rail lines; freight and passenger train delays and cancellations are likely in areas that see heavy rainfall and potential track inundation.
Localized business disruptions will likely occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, evacuations, and some employees' inability to reach work sites.
Advice
Monitor local media for weather updates and related advisories. Confirm all transport reservations and business appointments before travel. Make allowances for localized travel delays and potential supply chain disruptions where flooding has been forecast. Do not drive on flooded roads. Charge battery-powered devices in the case of prolonged electricity outages.
