Fluctuations in the Northern Hemisphere's atmospheric circulation system, a weak La Nina ENSO state, and global warming caused northern Vietnam's winter to be warmer than usual.
Starting the morning of 9/3, a cold air mass is expected to sweep across northern Vietnam, dropping nighttime temperatures to 15-18 degrees C and bringing thunderstorms and strong gusts.
A cold air mass is moving south, expected to sweep into the Northeast region tonight, 2/3, before extending across the plains and into the Northwest region.
