By The Nation
In the eighth in a series of alerts about the temperature drop, issued at 5am on Wednesday, the department said a high-pressure system was moving over the Northeast.
It would bring rain on Wednesday and Thursday, followed by a sharp drop in the temperature.
The Northeast would feel the cold first, it said, predicting a 6-8 C plunge, followed by the North, Central region and East, where the temperature would decrease by 4-6 C.
Conditions are expected to warm slightly between Friday and Monday, though mountaintops will remain chilly.
People in the South, meanwhile, have been told to brace for heavy rains Thursday through Monday, unleashed by the northeast monsoon crossing the Gulf of Thailand.