The monsoon through lies across the North and the upper Norhtheast while the moderate southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf with isolated heavy rain in the upper country. People in these 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.