The centre said a cold air mass is currently moving southward, while scattered showers and thunderstorms are occurring in parts of the northern region.
The cold air is forecast to reach northeastern Viet Nam from the evening and night of October 4 before spreading to other parts of the north and the area from Thanh Hoa to Hue. Winds will shift to the northeast at levels 2-3 inland and levels 3-4 along coastal areas.
Northeastern Viet Nam and Thanh Hoa are expected to turn cool from the night of October 4, with chilly conditions possible in some high mountainous areas.
Minimum temperatures during the cold spell are forecast at 19-22 degrees Celsius in most of northern Viet Nam and Thanh Hoa, and 14-17 degrees Celsius in high mountainous areas.
The cold spell is expected to reach Ha Noi in the early morning of October 5.
