A low-pressure cell over Cambodia has caused a monsoon trough to lie over the lower part of central Thailand, the upper south, and the east of the country since yesterday.
The Nation reports that there is also a strong southwest monsoon across the Andaman Sea, as well as the south and the upper Gulf of Thailand. Strong waves around 2-3 metres high are expected in the upper Andaman and upper Gulf, rising to 3 metres during thunder showers.
All ships should proceed with caution and avoid thunder showers, while small boats should stay ashore through September 19.
Rain is expected to continue in many areas, with heavy to very heavy rain forecast in particular for Rayong, Chantaburi, Trat, Ranong, Phuket and Krabi, with the possibility of severe conditions in some areas.
However, the North and North-East can finally expect an easing off of the rains that have caused severe flooding and disruption over the last few weeks.