
The provinces are Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Ranong, Phangnga, Phuket and Krabi.
The department said heavy rainfall would result from a tropical depression over the lower South China Sea that, as of 4am, was 748 kilometres east of Songkhla at latitude 7 degrees north and longitude 106 degrees east.
The storm, with winds of 55km/hour, was moving slowly west across the southern tip of Indochina towards the Gulf of Thailand.