Parts of the South, the East, the Central Plains and Bangkok and surrounding provinces are being warned of “heavy” and “extremely heavy” rain from Wednesday until Friday.

In an announcement issued on Wednesday, the Meteorological Department said a strong southwest monsoon in the Andaman Sea, the South and the Gulf of Thailand is bringing torrential (rain)rainto these parts of the country.

People living in these affected areas have been warned to brace for possible flash floods, while fishing boats have been cautioned against going out to sea during the same period, the department said.

Waves will rise between 2 metres and 3 metres during the period, the department said.

Provinces included in the torrential (rain)rainwarning are Ratchaburi, Nakhon Pathom, Samut Songkhram, Samut Sakhon, Bangkok, plus provinces including Chanthaburi, Trat, Chumphon, Surat Thani, Naknon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, Narathiwat, Ranong, Phangnga, Phuket, Krabi, Trang and Satun.

The department also advised those who are planning to travel to the Philippines and Taiwan to closely monitor weather updates before going as tropical storm Danas has developed in the Pacific Ocean and is expected to pass upper Luzon in the Philippines to Taiwan soon.