18 Jul 2022 | 08:34 AM UTC
Japan: Severe weather forecast over Tsushima in Nagasaki Prefecture through at least July 19
Heavy rainfall forecast over Tsushima in Nagasaki Prefecture, Japan, through at least July 19; evacuations ongoing due to landslide risk.
Event
Heavy rainfall is forecast to bring a threat of flooding and landslides to Tsushima sub-prefecture in Nagasaki Prefecture through at least July 19. Due to the threat of landslides, authorities have issued an evacuation order for the whole of Tsushima City advising those in places prone to landslides to evacuate. The order affects over 28,000 people from over 14,000 households. Authorities may issue additional evacuation orders if weather conditions persist or worsen. Over 11 cm (4 inches) of rainfall per hour is forecast in the area late July 18 and a further 15-20 cm (6-8 inches) is forecast across parts of Tsushima early July 19. Due to the heavy rainfall, the Sago River Observatory has warned that the river level has risen above the flood risk level, enhancing the threat of flooding in riverine areas.
As of July 18, the Japan Meteorological Administration has issued purple warnings for heavy rain and landslides (the highest level on a four-tier scale) for Tsushima, as well as red heavy rainfall and flood warnings. Yellow gale, high wave, thunderstorm, and storm surge warnings have also been issued. Authorities will likely issue new warnings or update existing advisories in 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 remain possible in hilly or mountainous areas, especially where the soil has become saturated by heavy rainfall. 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 regional airports. Authorities may temporarily suspend port operations or close beach fronts if strong winds trigger hazardous sea conditions. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible 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.
