Vietnam: Adverse weather forecast across south-central regions through at least Dec. 16

Severe weather is forecast across parts of south-central central Vietnam through at least Dec. 16. The Vietnam National Center for Hydro-Meteorological Forecasting (NCHMF) has issued a warning for heavy rainfall from Thua Thien Hue to Khanh Hoa provinces through Dec. 12. Forecast models indicate rainfall totals of 4-10 cm (2.8-3.9 inches) Dec. 10-11, with locally heavier amounts of more than 15 cm (6 inches) in some areas. The heavy rainfall may trigger flooding in low-lying areas, flash floods on small rivers and streams, and landslides on steep slopes. Thunderstorms and associated strong winds, lightning, and possible tornadoes may accompany the downpours. The NCHMF has issued a level 1 warning of natural disaster risk across the affected area. Further moderate-to-heavy rainfall with thunderstorms is forecast in the region Dec. 11-15, with scattered showers likely Dec. 16. Officials could update and extend the coverage of 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 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 rain has saturated the soil. Disruptions to electricity and telecommunications services are possible where significant flooding, strong winds, or landslides impact utility networks.

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 regions. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas with 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 and some employees' inability to reach work sites.