The Thai Meteorological Department forecasts heavy to very heavy rain in parts of the South, and heavy rain in parts of the Central region, Bangkok and its vicinity, and the East, with about 70% of Bangkok area getting thunderstorms today. Expect flash floods, landslides and waterlogging in low-lying areas, so plan deliveries and staff travel around flood-prone routes. A low-pressure system in the South China Sea may become a tropical storm and approach northern Vietnam around 13-14 Sep. Sea waves of 1-2 m or more affect boats and fishing or shipping operations; check forecasts again through the week.