The cold spell is forecast to affect northern provinces on the morning of October 14, according to the centre. It will cause heavy rains in northern and north-central provinces and rough seas in the Bac Bo (Tonkin) Gulf.

Meanwhile, tropical storm Banyan is entering the East Sea at a speed of 10-15km/h. At 01.00am on October 13, the storm was positioned at 12.4 degrees north latitude and 121 degrees east longitude, packing winds of 62-74km/h near its centre.

In the next 24-48 hours, Banyan is forecast to move between northeast and north-northeast at a speed of 10-15km. It will cause rough seas in the northern and eastern parts of the East Sea.