It said a monsoon trough lies across the lower North, the upper Central and the Northeast regions, while the southwest monsoon lies above the Andaman Sea and the Gulf of Thailand.
The department warned of possible flash floods and overflowing waterways in low-lying areas. Waves will be one to two metres in height in the upper Andaman Sea and the upper Gulf of Thailand, rising above two metres during thundershowers. In the lower Andaman Sea and the lower Gulf of Thailand waves will average one metre in height, but could be twice as high during thundershowers.
The department urged all ships to avoid thundershowers.
North
Fairly widespread thundershowers and isolated heavy rains in Mae Hong Son, Chiang Mai, Lamphun and Tak. Minimum temperature 23-24° celcius. Maximum temperature 30-34°C. Winds five to 5 kilometre per hour.
Northeast
Fairly widespread thundershowers and isolated…
