The Thai Meteorological Department forecasts thunderstorms over 70% of the North and 60% of Bangkok and its vicinity, with isolated heavy rain over the next 24 hours. Flash floods and forest run-off are possible on foothill slopes near waterways and in low-lying areas. For a business, check stock storage and delivery routes in those zones, and move goods or equipment off the floor where water could reach. Sea waves of 1-2 metres in the upper Andaman Sea and about 1 metre elsewhere mean small boat operators should take care.