Torrential rains and flooding risk
The Thai Meteorological Department issued a stark warning on Friday: heavy rains, flash floods, and rough seas are expected as Tropical Storm Mitag approaches the South China Sea. The monsoon front stretches across central, eastern, and northeastern regions, combining with an active low-pressure system to create explosive weather conditions.
Authorities urged the public to exercise extreme caution. Low-lying areas and slopes near waterways are particularly at risk, with severe flooding possible. In Bangkok and surrounding provinces, very heavy downpours could hit, causing widespread disruption and danger to residents.
At sea, waves in the upper Andaman Sea and Gulf of Thailand may reach 2 metres, while the lower Andaman Sea could see waves over 2 metres during thunderstorms. Fishermen and sailors were advised to avoid venturing into open waters entirely.
Tropical Storm Mitag and indirect threats
Although Mitag is forecast to make landfall in southern China on 19 September, its effects are already amplifying Thailand’s already hazardous weather. The combination of the strengthening southwest monsoon and the approaching storm has created conditions described by officials as “life-threatening” for boats, water sports, and coastal communities.
Tourists and locals along the coast, particularly on Phuket, were warned to seek safe shelter as conditions deteriorate. Extreme wind shifts, rising tides, and sudden thunderstorms could turn everyday activities into deadly hazards.
Regional outlook: coast to coast
Bangkok and eastern provinces – including Nakhon Nayok, Chon Buri, Rayong, and Trat – face widespread thunderstorms with occasional very heavy rainfall. In the northeast and central regions, provinces such as Loei, Nakhon Ratchasima, Ayutthaya, and Lopburi will see heavy storms and flash floods. Northern provinces are not spared, with Tak, Phitsanulok, and Sukhothai also expecting localized severe weather.
Southern coastal areas are under similar threat. The eastern coastline – Phetchaburi, Chumphon, Surat Thani – will experience thunderstorms and strong rains, while west coast regions including Ranong, Phang Nga, Phuket, and Krabi face dangerous waves and sudden squalls. Waves in affected areas are expected to exceed 2 metres during storms, making any sea activity highly perilous.
Officials warned that the combined effect of heavy rain, extreme winds, and rough seas could create life-threatening conditions across the country, urging everyone to remain vigilant and avoid risky travel until the storm system passes.