The Thai Meteorological Department forecasts 13–18 Sept rain across most regions, with 60–80% of areas getting thunderstorms and very heavy rain in spots (central, northeast, east, and Bangkok 60–80%). Flash floods and landslides are possible near waterways and low-lying areas. Expect delivery delays and flooded shopfronts or warehouses in low spots, so move stock off floors, plan alternative routes, and avoid travel through known flood-prone roads. Small boats in the upper Andaman should stay in port 15–18 Sept. Check the forecast daily, since a tropical storm near central Vietnam may affect the pattern.