The Meteorological Department expects heavy to very heavy rain across the North and upper Northeast from Tuesday to Friday, with flash-flood and runoff risk in foothill communities, waterside areas and low-lying districts. Low-lying roads may flood briefly, so plan delivery routes and move stock off the floor in vulnerable premises. Sea conditions also worsen Wednesday to Friday: waves of 2-3 metres in the upper Andaman Sea, over 3 metres during thunderstorms, and around 2 metres in the upper Gulf. Small boats in the upper Andaman should stay ashore, and operators should avoid stormy areas.