The Meteorological Department said a low-pressure trough over Laos and Vietnam and a strong southwest monsoon over the Andaman Sea and the Gulf of Thailand had triggered heavy rain in the North, Northeast and Central region.

From yesterday until tomorrow, the eastern provinces face heavy downpours, and residents in flood-prone areas should be on alert, it warned.

Waves in the Andaman Sea and the Gulf of Thailand will be strong and up to three metres high. Fishing vessels are advised to sail with caution and small craft warned not to leave port.