BANGKOK, THAILAND – Thailand’s weather agency warned that severe rainfall and worsening air pollution would pose heightened risks across large parts of the country over the next 24 hours.
Heavy rain alerts in seven southern provinces
The Thai Meteorological Department (TMD) reported that rainfall had been set to increase sharply in seven southern provinces: Prachuap Khiri Khan, Chumphon, Surat Thani, Phatthalung, Songkhla, Pattani and Nakhon Si Thammarat. Authorities said intense downpours could trigger flash floods on roads and landslides on saturated slopes.
Officials urged residents to remain on high alert.
“Expect dangerous volumes of water,”
said meteorologists, warning that already soaked ground could barely absorb further rain.
Unsettled weather across the country
Thunderstorms were also expected in the north, northeast and east, mostly with light to moderate intensity. In higher areas, mornings remained cool to cold, accompanied by dense fog.
A meteorologist explained the volatility of the situation.
“The combination of cool air and local showers made the situation unpredictable,”
said one expert, adding that many regions had to prepare for abrupt weather changes.
Chinese high-pressure system drives cold and rain
The TMD traced the instability to a moderate high-pressure system from China extending over much of Thailand, the northeast and the South China Sea. Cooler air flowed into the northern and northeastern regions, while moisture was transported into eastern and central areas.
This led to cooler conditions in the north and increased rainfall further south, a mix that continued to cause turbulence. Experts also warned of reduced visibility due to fog and a heightened risk of forest and bush fires in some areas with dry air.
Dangerous seas in Gulf of Thailand and Andaman
Maritime authorities reported that waves in the upper Gulf of Thailand had reached 1–2 metres and could rise significantly higher during thunderstorms. Fishers and boat operators were urged to avoid storm zones.
Conditions in the Andaman Sea were described as similarly hazardous, and the TMD advised especially small vessels to remain in port.
“Anyone who goes out now risks their life,”
said an experienced seaman.
PM2.5 smog worsens in Bangkok and the north
While the south struggled with torrential rain, Bangkok and the central region, along with the north and parts of the east, faced rising levels of fine particulate matter. PM2.5 readings continued to climb, pushing air quality in many locations into the moderate to poor range.
The main cause was described as weak air circulation that trapped pollutants near the ground, posing particular dangers for vulnerable groups. Doctors recommended wearing protective masks and avoiding unnecessary outdoor activities during periods of high smog.
Authorities urge ongoing vigilance
The weather service called on the public to stay alert and follow official updates closely. People in the southern provinces affected by heavy rain and in regions hit by smog were told to expect further warnings in the coming days.
Summarising the situation, a TMD spokesperson said:
“Whether rain or smog, the situation remained tense.”
said a spokesperson for the TMD.