As of September 9, cold air has begun to affect Northern Vietnam, while the East Sea is expected to see the formation of a tropical depression within the next few days, which may strengthen into a storm. The National Center for Hydro-Meteorological Forecasting reported that the cold air is already impacting the northern regions, and weather patterns over the East Sea could result in significant rainfall for Central Vietnam in the coming days.

Forecasts indicate a 70-80% probability of a tropical depression forming around September 12-13 in the central part of the East Sea, with a 30-40% chance of it intensifying into a storm. If the tropical depression or storm develops and interacts with the cold air and the tropical convergence zone, Central Vietnam could experience widespread heavy rainfall lasting until approximately September 17.

The meteorological agency warns of high risks of thunderstorms, lightning, flash floods, landslides, and localized flooding during this period. Two scenarios for rainfall in the coming days have been presented. The more likely scenario, with a 60-70% probability, suggests that heavy rain will begin on September 10 and continue until around September 16, primarily affecting areas from Ha Tinh to Gia Lai. The alternative scenario, with a 30-40% probability, indicates that heavy rainfall might start later, around September 14, and persist until September 17, focusing on regions from Nghe An to Hue.

This anticipated rainfall follows recent heavy rains in Central and Central Highlands regions, where some areas recorded over 100mm of rain between 7 PM on September 8 and 8 AM on September 9. For instance, Ea Kmut in Dak Lak recorded 130mm, while Gia Nghia in Lam Dong saw 106mm. On September 10, the affected area is expected to expand, with rainfall of 30-60mm forecasted for regions from Thanh Hoa to Hue, and the Central Highlands and Southern regions could see localized amounts exceeding 120mm.

On September 11, these areas may continue to receive 40-90mm of rain, with some locations potentially exceeding 150mm. After this period, heavy rainfall in Central Vietnam is expected to persist and evolve in complexity.

The meteorological agency has assessed that the 2026 storm season will see fewer storms and tropical depressions in the East Sea compared to the average of previous years. However, there remains a possibility of strong storms with complex developments. From September to December, the areas affected by storms and tropical depressions are likely to shift gradually southward to Central Vietnam and southern provinces.

In light of the imminent heavy rains, thunderstorms, flash floods, landslides, and localized flooding, the National Civil Defense Steering Committee has urged localities to closely monitor weather developments and proactively implement response plans. Local authorities are instructed to promptly inform residents, review areas at risk of deep flooding, flash floods, and landslides, and prepare to evacuate people to safety if necessary. Localities must also be ready with personnel and equipment according to the '4 on-site' principle, prepared for rescue operations and to assist residents during natural disasters.