BANGKOK, Thailand – The Meteorological Department has warned residents in eastern Thailand to prepare for heavy rainfall and possible flash flooding as the southwest monsoon continues to influence weather conditions across the country. In its forecast issued on July 18, the department said scattered thunderstorms are expected nationwide, with some areas of the East facing heavy rain due to the southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand, while a low-pressure system remains over upper Vietnam.
Residents in eastern provinces, particularly those living near foothills, waterways, and low-lying areas, were advised to monitor conditions closely as accumulated rainfall could trigger flash floods and runoff. Chanthaburi and Trat have been identified as areas at risk of heavy to very heavy rainfall.
The department also warned of moderate sea conditions. Waves in the upper Andaman Sea and upper Gulf of Thailand are expected to reach 1–2 metres, while areas experiencing thunderstorms may see waves higher than 2 metres. Boat operators have been advised to exercise caution and avoid areas affected by storms. The seven-day forecast indicates that Thailand will continue experiencing thunderstorms on July 18–19 due to the low-pressure system near Vietnam and moderate southwest monsoon winds.
From July 20–24, rainfall is expected to increase, with heavy rain possible in parts of the North and western areas of the Central Region as the monsoon strengthens. Authorities warned that prolonged rainfall could lead to flash floods, forest runoff, and overflowing waterways, especially in mountainous areas and communities located near rivers and drainage channels. Meanwhile, the Meteorological Department reported earthquakes measuring 5.2 and 4.1 magnitude in Myanmar between July 17–18, but confirmed that the events caused no impact in Thailand.
