Thailand Warns 15 Provinces of Landslides and Flash Floods as Monsoon Peak Arrives

Thailand Warns 15 Provinces of Landslides and Flash Floods as Monsoon Peak Arrives

Bangkok, Thailand — Thailand's Department of Mineral Resources has issued an urgent warning to residents in 15 provinces across the country to remain vigilant for landslides and flash floods over the next one to three days, as relentless monsoon rains continue to saturate the region.

The warning comes at the peak of Thailand's monsoon season, with the Meteorological Department having already issued its 13th official advisory for heavy to very heavy rainfall. The combination of a monsoon trough stretching across the North and upper Northeast, together with a strengthening southwesterly monsoon over the Andaman Sea, the Gulf of Thailand, and the mainland, has created conditions that the department's Geological Disaster Operations Centre describes as highly concerning.

Provinces on Alert

The 15 provinces placed on high alert span multiple regions of the country. In the North, residents of Chiang Mai, Chiang Rai, Mae Hong Son, Nan, Phrae, and Uttaradit have been warned to prepare for potential landslides and flash flooding. The northeastern provinces of Loei, Nong Khai, Bueng Kan, Sakon Nakhon, and Nakhon Phanom are also at elevated risk, as are the eastern provinces of Chanthaburi and Trat. In the South, Ranong and Phang Nga complete the list of at-risk areas.

These provinces share common geographic features that make them particularly vulnerable during prolonged heavy rainfall: mountainous terrain, steep slopes, and proximity to rivers and coastlines. Communities living in foothill areas and along riverbanks are being urged to pay close attention to water levels and ground conditions.

What the Department Is Saying

The Geological Disaster Operations Centre of the Department of Mineral Resources has activated its disaster monitoring and warning network, which includes local volunteers trained to detect early signs of ground movement and rising water levels. These volunteers serve as the first line of communication between remote communities and central authorities, a system that has proven invaluable during previous monsoon seasons.

Residents in the warned provinces have been advised to monitor the situation continuously through official channels, including the Department of Disaster Prevention and Mitigation's 1784 hotline and local administrative announcements. The department has specifically cautioned that even areas that have not experienced landslides in recent years could be at risk this season, as the cumulative rainfall has already surpassed seasonal averages in several regions.

For those living in landslide-prone areas, the department recommends preparing emergency bags with essential documents, medications, drinking water, and dry food. Families should identify safe evacuation routes to higher ground and agree on a meeting point in case family members are separated during an emergency.

Already Seeing the Impact

The monsoon's toll has already been felt across the country this month. In late July, the Mae Ai district of Chiang Mai province experienced significant flash flooding following intense evening rainfall, inundating homes and farmland near the Myanmar border. The flooding in Mae Ai served as an early warning of what the broader region could face as the monsoon intensifies.

Earlier this monsoon season, in early June, the Department of Disaster Prevention and Mitigation had already warned six southern provinces — including Nakhon Si Thammarat, Surat Thani, and Phatthalung — to prepare for heavy rain, flash floods, and rough seas as a strong southwest monsoon affected the region from June 3 to 8. That warning proved prescient, with several districts reporting flood damage and disrupted transportation.

The frequency and intensity of these warnings reflect a pattern that Thai communities know well: the monsoon season brings life-giving water to the rice paddies and reservoirs, but it also demands respect and preparation. For the farmers of the Central Plains and the fishing communities along both coastlines, the rains are both a blessing and a burden.

What the Meteorological Data Shows

The Thai Meteorological Department's 13th warning, issued earlier this week, highlighted that the monsoon trough currently crossing the North and upper Northeast would combine with the strong southwesterly monsoon to produce heavy to very heavy rainfall in many areas. The warning is effective through the end of July, with conditions expected to persist into early August.

The department has reported rainfall accumulations of 60 to 90 millimeters in several northern and northeastern provinces over 24-hour periods, with some areas receiving over 100 millimeters during the heaviest downpours. These levels are sufficient to trigger landslides in areas where the soil has already been saturated by weeks of continuous rain.

In the Andaman Sea and the Gulf of Thailand, waves are expected to reach two to three meters during thundershowers, prompting warnings to small boats to remain ashore. The rough seas advisory affects fishing communities along both coastlines, many of whom rely on daily catches for their livelihoods.

A Regional Challenge

Thailand's monsoon struggles are part of a broader regional pattern this July. Across Southeast and East Asia, monsoon rains have triggered landslides and evacuations in multiple countries. Vietnam has reported significant flooding in its northern provinces, while southern China has faced its own landslide emergencies. The same monsoon system that feeds Thailand's rains extends across the Mekong region, affecting communities from Myanmar to Cambodia.

For Thai authorities, the challenge is compounded by the El Niño-influenced weather patterns that have made this monsoon season less predictable than usual. The Department of Mineral Resources has noted that the combination of prolonged dry spells followed by intense rainfall — a pattern associated with El Niño transitions — creates particularly dangerous conditions for landslides, as vegetation cover is reduced and soil structure is weakened before the heavy rains arrive.

Regional cooperation on disaster monitoring has improved in recent years, with Thailand sharing data and early warning protocols with ASEAN neighbours through the ASEAN Coordinating Centre for Humanitarian Assistance. This collaborative approach has helped standardise warning systems and improve response times across borders.

Staying Safe During the Monsoon

For Thai readers in the affected provinces, the department has provided clear guidance. Residents should watch for these warning signs of potential landslides: cracks appearing in roads or walls, trees tilting or falling, sudden changes in water flow in streams and canals, and rumbling sounds from hillsides. Anyone observing these signs should evacuate immediately and notify local authorities.

For flash flood safety, the key message is simple: never attempt to cross flowing water on foot or in a vehicle. Just 15 centimeters of moving water can knock a person off their feet, and 60 centimeters can sweep away most vehicles. Drivers in the warned provinces should avoid routes that pass through low-lying areas during heavy rain, and should never ignore road closure signs.

The Department of Disaster Prevention and Mitigation's 1784 hotline operates 24 hours a day for emergency reporting and information. Local administrative organisations in each province also maintain communication channels for residents to check road conditions and receive evacuation orders.

In Thai communities, neighbours looking out for neighbours remains one of the most effective disaster preparedness strategies. The department encourages residents to check on elderly neighbours, families with young children, and those with disabilities who may need additional assistance during an emergency. This spirit of community care — what Thais call "nam jai" — is especially vital during monsoon season.

A Season of Caution and Community

Monsoon season in Thailand is a time when the entire nation turns its attention to the skies. From the rice farmers of Isaan watching for the rains that will nourish their crops, to the urban residents of Bangkok monitoring canal levels and drainage systems, to the fishing families along the Andaman coast securing their boats — the monsoon touches every life.

This week's warning for 15 provinces is not a cause for panic, but it is a call for preparation. Thailand's disaster response systems have improved significantly over the past decade, with better early warning networks, more shelters, and faster response teams. But the first line of defence has always been, and remains, an informed and prepared community.

The Department of Mineral Resources has promised to continue monitoring conditions around the clock and to issue updates as the situation develops. For now, residents in the warned provinces are asked to stay informed, stay prepared, and stay safe.

By Ann Srisawat, Staff Writer

This article was produced with AI-assisted research and editorial support. Reporting is based on sources cited in the article.