It borders the South China Sea, hence, seeing the increased likeliness of tropical cyclones.
Climatologically, in the Northwest Pacific basin, most tropical cyclones tend to develop between May and October.
The most active tropical cyclone season for Vietnam is in 2013, with their meteorological agency tracking 15 storms, in which 9 have made landfall.
The NCHMF tracks a storm should it enter the agency's monitoring area range which is within the South China Sea to the west of 120°E and north of 5°N.
A study was investigated in the correlation of rainfall and tropical cyclones during El Niño and La Niña seasons, and showed that there is an increase of rainfall and tropical cyclones during La Niña seasons.