The monsoon trough lies across the North and the Northeast of Thailand while the moderate southwest monsoon prevailing over the Andaman Sea, the South, the Central, the East and the Gulf is strengthening. Isolated heavy to very heavy rains are likely in the upper country while isolated thundershowers are possible in the South. The strengthening wind force the waves in the upper Andaman Sea are likely 2-3 meters high and above 3 meters high in thundershowers. In the lower Andaman Sea and the upper Gulf, the waves are likely about 2 meters high and above 2 meters high in thundershowers.