Thailand’s Meteorological Department warned of very heavy rainfall in parts of Prachuap Khiri Khan, Chumphon, Surat Thani and Phuket.

The forecast covered the period from 6am on 29 October to 6am on 30 October, Thai time.

According to The Nation’s account of the bulletin, thundershowers were forecast across 70% of each southern coastal region. Officials highlighted the possibility of flash flooding and run-off, particularly near foothills, waterways and low-lying ground.

A low-pressure area over the Andaman Sea, together with easterly winds, was contributing to the unsettled conditions.

Marine conditions were also a concern. Waves in the Andaman Sea and Gulf of Thailand were forecast to exceed 2 metres in thunderstorms, and boat operators were advised to avoid storm-affected waters.