People living in northern, north-eastern, central and southern Thailand can expect heavy to very heavy rain and accumulations, which may cause flash floods and overflows, especially along waterways and lowland from July 29^th to August 1^st, according to the Meteorological Department.

It says that a moderate monsoon trough will move south, to lie across northern Laos, meeting a low pressure cell over the coast of northern Vietnam. In the meantime, the southwest monsoon prevailing over Thailand will strengthen.

More rain is expected for the whole country, with isolated heavy downpours in northern, north-eastern, southern and central regions, including Bangkok.

Waves heights of up to 3 metres, and over 3 metres in stormy areas, and strong winds are predicted in the northern Andaman Sea and the northern Gulf. All vessels are advised to exercise caution and keep out of stormy areas, while small boats should remain ashore.