20 Sep 2023 | 11:03 AM UTC
South Korea: Adverse weather forecast across much of the country through at least Sept. 22
Heavy rainfall forecast across much of South Korea through at least Sept. 22. Possible flooding and associated disruptions.
Event
Severe weather is forecast across much of South Korea through at least Sept. 22. Heavy rainfall accompanied by strong wind gusts and possible thunderstorms is expected across many areas late Sept. 20-early Sept. 21 and will linger in some regions through early Sept. 22. The heaviest rainfall is forecast in southern and western regions, with rainfall totals of more than 12 cm (4.7 inches) possible in places late Sept. 20-21.
As of Sept. 20, the Korea Meteorological Administration (KMA) has issued heavy rain warnings across central and southern South Chungcheong Province and Sejong City, as well as far northeastern North Gyeongsang Province. Heavy rain advisories are in place across parts of central, far eastern, southern, and western South Korea. Strong wind advisories are in place for southern coastal regions, including Jeju Island. Officials could update and extend the coverage of the relevant weather alerts over the coming days.
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 or a lack of 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 the soil has become saturated by heavy rainfall.
Disruptions to electricity and telecommunications services are possible where strong winds and flying debris impact utility networks. Strong winds are likely to result in hazardous driving conditions and impact overland travel. Localized business disruptions may occur; some businesses might not operate at full capacity because of damage to facilities and some employees' inability to reach work sites.
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. The disruptive weather may cause additional delays and cancellations at airports across the affected region. Flooding could block regional rail lines; freight cancellations are possible in areas subject to heavy rainfall and track blockages.
Disruptions triggered by inclement weather and resultant hazards, such as flooding, could persist well after weather conditions have improved; it could take days before any floodwaters recede and/or officials clear debris. If there is severe damage to infrastructure, repair or reconstruction efforts may result in residual disruptions.
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 strong winds and heavy rainfall have been forecast. Do not drive on flooded roads. Charge battery-powered devices in the case of prolonged electricity outages.
