The Thai Meteorological Department warns of heavy rain in the northern lower region, central plains, Bangkok and vicinity, the east and upper south over the next 24 hours, with flash-flood and flash-flood-driven risk near streams and low-lying areas. Thunderstorms cover 60-70% of central and eastern areas. Sea waves above 2 metres are forecast in the Andaman Sea and Gulf of Thailand where storms occur. For shops and workshops: move stock off floors, plan delivery routes around flooded roads, and check staff travel to work. Boat operators should avoid storm zones.