The National Center for Hydro Meteorological Forecasting said the cause of torrential rains which occurred yesterday afternoon in the capital was due to the sudden spread of a cold wave.
Earlier, the center warned from September 26 to 27, the second cold spell would hit the northern region causing heavy rains on the large-scale.
Yesterday also, the center said from now till end of September 2018, the north will continue to be hit by a cold spell.
On these days, a cold wave is moving in the south part of China and it is forecast to heading to the east and east southern.
This morning September 28, a cold spell is predicted to effect to the northern delta region including Hanoi capital.
Due to the impact of cold wave, this afternoon, the northern region would experience prolonged rains and scattered thunderstorms. Heavy rains will move to the northern and central central region. The lowest temperature I in the mountainous areas will be at 20 to 22 degree Celsius.
Cold weather will continue to hit the north and northern mountainous region from now till early October.
In the central highlands and southern region, rains will appear several areas in October.