According to the Southern Regional Hydro-Meteorological Center, thunderstorms are expected to occur in various areas of Southern Vietnam. On June 27, satellite images and weather radar data indicated the development of convective clouds, leading to rain showers accompanied by thunderstorms and lightning in several districts including Hanh Thong, Phu Nhuan, Gia Dinh, Go Vap, An Nhon, An Khanh, Binh Loi Trung, Tang Nhon Phu, and Binh Quoi.

In the next three hours, these convective clouds are projected to continue developing, maintaining rain showers, thunderstorms, and lightning in the aforementioned areas, while also expanding to other regions such as Thu Duc, Phuoc Long, Long Truong, Tam Binh, An Khanh, Saigon, and Ben Thanh.

Rainfall is expected to range from 5 to 20 mm, with some areas exceeding 25 mm. Residents are advised to be cautious of strong winds, hail, and lightning during thunderstorms, with wind speeds reaching levels 5 to 7 (8-17 m/s). Intense rainfall over a short period may cause localized flooding in low-lying areas.

The weather forecast for the next 24-48 hours indicates that the low-pressure trough passing through the northern region will continue to weaken. The southwest monsoon will maintain moderate intensity. At higher altitudes, the subtropical high-pressure system in the southern region will gradually shift northward and extend westward, while convergence aloft will persist over Southern Vietnam.

From around June 28, a low-pressure trough is expected to form in a northwest-southeast direction through the central region and the middle of the East Sea. Over the next 3 to 10 days, this low-pressure trough, connecting with a hot low-pressure area in the west, will develop and extend eastward.

The southwest monsoon will continue to operate at moderate intensity, with a tendency to strengthen around June 30. The low-pressure trough through the central region and the middle of the East Sea will also become more active.

In summary, Southern Vietnam is expected to maintain prevalent weather patterns with nighttime rain showers and scattered thunderstorms, sunny weather during the day, and the possibility of heavy rain in the late afternoon and evening.