The warning include the resort island of Phuket, where a flash flood yesterday disrupted local transport and tourism businesses in some areas.

Navy personnel in the island’s main town were seen carrying elderly on their backs through streets, knee-deep in brown water.

Heavy rain and tropical storms since last month have caused flooding in 59 of Thailand’s 77 provinces, impacting 450,000 homes, according to the interior ministry.

Floods in northeastern and central Thailand – key farming regions – have seen 107,200 hectares of agricultural land damaged, the agriculture ministry said last week.

Prime Minister Prayuth Chan-ocha has instructed authorities nationwide to deploy boats and vehicles to help reconnect people cut off by floods and provide assistance where possible.

The cabinet last week has set aside 23 billion baht budget for assistance and flood rehabilitation.

In neighbouring Malaysia, authorities issued rain warnings for Sabah, Sarawak Labuan on Borneo island owing to the Nesat tropical storm.