The monsoon through lies across the North, the upper Central and the lower Norhtheast regions while the moderate southwest monsoon prevails over the Andaman Sea, The South and the Gulf with isolated heavy rains in the Northeast, the Central including Bangkok and its vicinity, the East and the South regions. People in thease areas should beware of heavy rain and its accumulation that may cause flash floods and overflows especially along the waterways near foothills and lowlands. The moderated wind and waves in the upper Andaman Sea are expected about 2 meters high and above 2 meters high in thundershowers. In the lower Andaman Sea and the upper Gulf, the waves are likely 1-2 meters high and above 2 meters high in thundershowers. All ships should proceed with caution and keep off thundershowers.