The Thai Meteorological Department says heavy rain will fall in some areas over the next 24 hours, with thunderstorms covering about 60% of Bangkok and the central region. Flash floods and runoff are possible near slopes and low-lying areas. For a small business, plan for delivery delays, move stock off ground floors and check drainage. Boats in the Andaman Sea and Gulf of Thailand face 1-2 m waves, so avoid sailing in storm zones.