South China Sea: Tropical Depression Krovanh moving westward in South China Sea Dec. 21; rain-related damages reported in Philippines /update 1

Event

Tropical Depression Krovanh continues to track in the west-southwest direction in the South China Sea, Dec. 21. As of 1000 ICT the system was located approximately 730 km (454 miles) east of Ho Chi Minh City, Vietnam. The system has caused heavy rainfall in Philippines, resulting in at least eight deaths and evacuations in the Caraga, Davao, and Eastern Visayas regions as of Dec. 21. Models indicate that the system will make a close approach to, or landfall over, far southern Vietnam late Dec. 22-early Dec. 23, though it will have weakened to a post-tropical low pressure system by this juncture. Significant uncertainty exists regarding the track and intensity forecasts, and changes are possible in the coming days.

Regardless of the exact track of the system, heavy rains and strong winds are likely in parts southern Vietnam, and southern and eastern Cambodia. Rainfall associated with TD Krovanh could trigger dangerous flash and urban flooding in low-lying communities near watercourses, as well as in urban environments with easily overwhelmed storm drainage systems. Rain-induced landslides pose an additional threat in hilly or mountainous locations. Authorities may issue evacuation orders in low-lying coastal areas and in regions that are prone to landslides. Winds may result in property damage and utility outages throughout the affected area. Storm surges are possible as the storm tracks closer to land.

Transport
The passage of the system may prompt ground, air, rail, and maritime transport disruptions in affected areas in the coming days. Traffic and commercial trucking may be delayed as the system transits the region. Vessel movements and cargo handling could be suspended at regional ports. Ferry services may be suspended due to rough seas. Strong winds could uproot trees or spread debris that might damage infrastructure or impede access along important thoroughfares. Landslides could block roads in areas of mountainous terrain, and flooding could inundate some routes.

Advice

Review contingency plans as early as possible. Be prepared to evacuate low-lying coastal areas as the storm approaches. Use caution in areas below major dams and around streams and other watercourses that could be prone to flash flooding. Confirm flights and rail reservations. Seek updated information on road conditions before driving or routing freight through areas affected by the typhoon. Plan accordingly for probable supply chain problems, especially if shipping cargo through regional airports or ports. Confirm flights before checking out of hotels or traveling to the airport. Charge battery-powered devices, and stockpile water and nonperishable food in case prolonged electricity outages occur.

Resources

Joint Typhoon Warning Center: www.metoc.navy.mil