Vietnam: Adverse weather forecast across central regions through at least Nov. 1

Heavy rainfall accompanied by thunderstorms is forecast across parts of central Vietnam through at least Nov. 1. As of Oct. 30, the Vietnam National Center for Hydro-Meteorological Forecasting (NCHMF) has warned of thunderstorms and moderate to heavy rainfall of 8-20 cm (3-8 inches) from Ha Tinh to Phu Yen provinces through Oct. 31. Heavy rainfall is likely to persist across Quang Tri to Phu Yen provinces through at least Nov. 1. The heavy downpours could trigger flooding in low-lying areas and landslides on stable slopes. Strong winds, lightning, hail, and possible tornadoes could accompany thunderstorms. The NCHMF has issued a level 1 (the lowest level) warning of natural disaster risk due to heavy rain, tornadoes, and lightning.

Parts of central Vietnam are still recovering from flooding caused by heavy rainfall since early October and the passage of Tropical Storm Sanba Oct. 19-22. The inclement weather and flooding displaced thousands of people across Da Nang and Thua Thien Hue provinces, as well as damaged more than 1,600 homes, predominantly in Da Nang City. Further heavy rainfall is likely to exacerbate the situation and hamper recovery efforts.

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 the soil has become saturated by heavy rainfall. 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. Authorities may temporarily suspend port operations or close beach fronts along the South China Sea coast if strong winds trigger hazardous sea conditions. 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 and some employees' inability to reach work sites.