Cold wave from China to grip northern VNCold air from China is approaching Viet Nam and is likely to have a direct impact on the northern and central provinces, the Central Hydro-Meteorological Forecast Centre has reported. According to the centre, the cold air will have relatively strong intensity, causing the weather to turn chilly with widespread rainfall. Influenced by the onset of the cold air, rainfall and thunderstorms occurred on Monday evening in the north. The cold air has also caused bad weather on the sea. The strong winds are expected to persist tonight.