11 Nov 2021 | 02:41 AM UTC
Japan: Severe weather forecast over northwestern regions through at least Nov. 12 /update 1
Severe weather affecting northwestern Japan, through at least Nov. 12. Disruptions possible.
Event
Thunderstorms and heavy rains bringing possible floods and landslides are forecast for northwestern Japan through at least Nov. 12. The Japan Meteorological Administration has issued the following warnings:
Purple (the highest level on a three-tier scale) warning for landslide due to heavy rain: Kaetsu region in Niigata Prefecture
Red warnings for heavy rainfall, flooding, landslides, and large waves: Akita, Ishikawa, and the rest of Niigata prefectures as well as Rumoi Region in Hokkaido Prefecture
Yellow heavy rain, thunderstorms, flooding, and landslide advisories: the rest of the affected area.
Authorities will likely issue new warnings or update existing advisories in the coming days; officials may issue evacuation orders if weather conditions persist or worsen.
Hazardous Conditions
Thunderstorms bringing lightning, strong winds, heavy rain, and tornadoes are possible through Nov. 12 across northwestern Japan, especially near the Sea of Japan.
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 along the Sea of Japan, Sea of Okhotsk, and the North Pacific Ocean 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.
