06 Jul 2023 | 01:51 PM UTC
Japan: Adverse weather forecast across western regions through at least July 10
Severe weather forecast across much of western Japan through at least July 10. Possible transport, business, and utility disruptions.
Event
Severe weather is forecast across much of western Japan through at least July 10. The Japan Meteorological Agency (JMA) has warned that a weather front over China on July 6 will reach western Japan on July 7 and will impact western Japan and the Hokuriku Region July 7-10. Rainfall totals of 10-20 cm (4-8 inches) are expected in parts of the northern Kyushu region July 7-8, and rainfall accumulations of over 30 cm (12 inches) are possible across the affected area through July 10. Heavy downpours could trigger flooding in low-lying areas and landslides on unstable slopes. 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.
As of July 6, the JMA has issued yellow storm surge warnings (the lowest level on a three-tier scale) across parts of Chugoku, Shikoku, and northern Kyushu regions and yellow thunderstorm warnings across much of southern Kyushu Region. Authorities will almost certainly issue new alerts or update/rescind existing advisories as weather conditions develop over the coming days.
Hazardous Conditions
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 located 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 rainfall has saturated the soil.
Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.
Transport
Floodwaters and debris flows may 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 may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible 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.
