The upper part of Thailand will have more rain and isolated heavy to very heavy rain during July 18-21 as Tropical Storm “Son-tinh,” which is moving in the westerly direction with the speed of 35 kilometres per hour, was expected to reach the Gulf of Tonkin this morning, and upper Vietnam this evening, according to the latest forecast of the Meteorological Department.

As of 4am this morning, tropical storm Son-tinh, was over the upper South China Sea with its maximum sustained wind of 70km per hour.

People are advised to take precautions against severe weather conditions and stay tuned for the weather forecast.

Also during July 18-21, the strong southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf of Thailand. Abundant rain with isolated heavy rain are likely in the Central, the East and the South.

Waves in the Andaman Sea and the upper Gulf of Thailand are expected to be 2-3 metres high and over 3 metres in areas with thundershowers. All vessels should proceed with caution and small boats are advised to remain ashore.

Residents along the eastern and western coasts of the South should watch for in-shore surges, said the announcement.