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Key Concepts

• Mưa to đến rất to (Heavy to very heavy rain): Significant rainfall amounts impacting various regions.
• Sạt lở đất, lũ quét (Landslides, flash floods): Hazards associated with prolonged heavy rainfall.
• Cảnh báo màu tím (Purple warning): Highest level of risk for landslides and flash floods.
• Ngập úng (Waterlogging/Flooding): Accumulation of water in agricultural areas, particularly affecting crops.
• Thối rễ, dụng quả (Root rot, fruit drop): Negative impacts of waterlogging on coffee plants.
• Thoát nước (Drainage): Essential agricultural practice to mitigate waterlogging.
• Tăng thông khí (Increase aeration): Agricultural technique to aid plant recovery.
• Mực nước lũ (Flood levels): Water levels in rivers, measured against warning levels.
• Báo động ba (Alarm level three): A critical threshold for river flood levels.
• Mưa lạnh (Cold rain): Rain accompanied by low temperatures.
• Mưa dông (Thunderstorms): Rain accompanied by lightning and strong winds.
• Lốc xoáy, gió giật mạnh (Tornadoes, strong gusts): Severe weather phenomena associated with thunderstorms.
• Biển động mạnh (Rough seas): Dangerous sea conditions with high winds and waves.

Weather and Hazard Update

Heavy Rainfall and Associated Risks in Central Vietnam

Overnight and into the early morning, the city of Da Nang and the eastern parts of Quang Ngai and Dak Lak provinces, as well as Khanh Hoa, experienced heavy to very heavy rainfall. In the past 8 hours, many rainfall stations recorded over 160 mm. Notably, the Hoa My Tay station in Dak Lak province received exceptionally heavy rain, reaching 320 mm.

Due to this intense rainfall, over 300 communes and wards from Hue City, Da Nang City, and the eastern regions of provinces from Quang Ngai to the northern part of Khanh Hoa province are at risk of landslides and flash floods. Many areas have received a "purple warning," indicating the highest level of danger.

Agricultural Impact and Mitigation Strategies

The prolonged heavy rainfall in recent days has led to significant waterlogging in many coffee-growing areas in communes such as Crong Bong, Co, Cu Pui, and Yang Mao in Dak Lak province. These areas were preparing for harvest, and the deep flooding has severely impacted expected yields.

Forecast for Dak Lak: Heavy rainfall in Dak Lak is predicted to continue for another 2 to 3 days. Today and tomorrow, the eastern part of Dak Lak will experience heavy to very heavy rain, with rainfall amounts generally ranging from 100 to 250 mm. The western highland areas, which have more coffee plantations, will also experience moderate to heavy rain. The ongoing rain will prolong the flooding in coffee fields. Coffee plants are known to be sensitive to waterlogging, with just 1 to 2 days of inundation potentially causing root rot and widespread fruit drop. Therefore, farmers are urged to urgently pump out water. After November 22nd, when the rain subsides and the surface soil dries, farmers should lightly till around the base of the coffee trees to increase aeration, promote faster recovery, and prevent soil compaction.

River Flood Levels in Central Vietnam

The region from Da Nang to Khanh Hoa continues to experience heavy rainfall, and river flood levels remain high.

• Today and Tomorrow: Da Nang City, the eastern parts of provinces from Quang Ngai to Dak Lak, and the northern part of Khanh Hoa province will generally receive 100 to 250 mm of rain. Some localized areas may experience very heavy rainfall exceeding 350 mm.
• River Forecasts:
  • Ba River (Dak Lak): By this afternoon, water levels are expected to rise above alarm level three, by 0.30 to 1.50 meters.
  • Cai River (Nha Trang) and Dinh Dinh River (Khanh Hoa): Water levels will fluctuate around and above alarm level three.
  • Vu Gia and Thu Bon Rivers (Da Nang): Water levels will be below alarm level two.
  • Con River (Gia Lai): Water levels will be below alarm level three.

Northern and Central Vietnam Weather Update

Northern Vietnam: Today, the region will remain cold throughout the day. However, from this afternoon, rainfall will begin to decrease, and the weather will become drier. The highest temperatures in communes, including Hoan Kiem in Hanoi, will be around 16 to 18°C.

North Central Vietnam: In communes from Tinh Gia (Thanh Hoa) to Thanh Sen (Ha Tinh), there will be a combination of rain and cold, with the highest temperatures ranging from 18 to 19°C. In communes from Dong Hoi (Quang Tri) to Hai Chau (Da Nang), there will be cold rain, with the highest temperatures not exceeding 24°C.

Southern Vietnam Weather Update

Southern Vietnam: From morning to noon today, there will be intermittent sunshine. The highest temperatures in communes will generally be between 30 to 32°C. Bien Hoa City in Dong Nai province will be slightly warmer, exceeding 33°C. In the afternoon and evening, scattered thunderstorms are expected, with some localized areas experiencing heavy rain exceeding 80 mm. During thunderstorms, residents should be aware of and prepare for potential tornadoes and strong gusts.

Maritime Weather Update

Offshore Areas (Far Offshore): Strong northeasterly winds are expected, ranging from force 7 to 8, with gusts of force 9 to 10. The sea will be rough, with thunderstorms accompanied by tornadoes.

Spratly Islands Area: Winds will be at force 5, but there is a risk of tornadoes and strong gusts accompanying thunderstorms.

Conclusion

The central region of Vietnam is currently facing significant rainfall, leading to a high risk of landslides and flash floods, particularly in areas with a purple warning. Agricultural areas, especially coffee plantations, are experiencing severe waterlogging, necessitating urgent drainage measures. River flood levels remain elevated in many areas. Northern Vietnam will see a decrease in rain and drier conditions from this afternoon, while remaining cold. Southern Vietnam will experience intermittent sunshine with rising temperatures, followed by scattered thunderstorms in the afternoon and evening, with a risk of severe weather phenomena. Maritime areas are experiencing strong winds and rough seas, with a risk of tornadoes in some regions.