A cold front having intensified to the south from the north as of this morning, and it is expected to spread over the Northern mountainous region tomorrow.
This morning, the National Center for Hydrology Meteorology Forecasting issued a weather forecast for Ho Chi Minh City, the Southeastern and Southern regions from the afternoons to mid-nights, notably a warning of sudden thundery showers in some places of Ho Chi Minh City today.
A low-pressure trough connecting with the low-hot pressure zone from the west, the intensify of the southwest monsoon and the newly-formed storm Choi-Wan in the southwest of the Philippines' Luzon Island have resulted in thundery showers in the sea and mainland of Vietnam.