DDPM Warns 49 Provinces and Bangkok to Beware of Flash Floods, Flooding, and Landslides from 6-9 Aug 2026

The Department of Disaster Prevention and Mitigation (DDPM) has issued a warning for 49 provinces and Bangkok to monitor for flash floods, sudden flooding, stagnant flooding, landslides, and strong winds from 6 to 9 August 2026 GMT+7.

At 05:00 on 5 August 2026 GMT+7, Mr. Theerapat Kachamat, Director-General of the DDPM, stated that the Central Disaster Prevention and Mitigation Command Center has been monitoring weather conditions and risk factors. The Meteorological Department issued Announcement No. 1 (143/2569) regarding strong winds in the upper Andaman Sea and upper Gulf of Thailand and heavy to very heavy rainfall in Thailand, announced on 4 August 2026 at 05:00 GMT+7.

The announcement states that from 6 to 9 August 2026, a monsoon trough will pass through the upper northern and upper northeastern regions, combined with a strong southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand.

Waves in the upper Andaman Sea will be 2-4 meters high, exceeding 3 meters in areas with thunderstorms. In the upper Gulf of Thailand, waves will be 2-3 meters high, with waves over 3 meters in thunderstorm areas. Heavy to very heavy rainfall is expected, which may cause flash floods, sudden flooding, stagnant flooding, landslides, and strong winds between 6 and 9 August 2026, detailed as follows.

The areas to monitor for flash floods, sudden flooding, stagnant flooding, and landslides include 49 provinces and Bangkok. They are:

• Northern region (15 provinces): Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Phrae, Nan, Uttaradit, Tak, Sukhothai, Kamphaeng Phet, Phitsanulok, Phichit, and Phetchabun.
• Northeastern region (17 provinces): Loei, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Kalasin, Mukdahan, Roi Et, Yasothon, Amnat Charoen, Nakhon Ratchasima, Surin, Sisaket, and Ubon Ratchathani.
• Central region (13 provinces plus Bangkok and metropolitan area): Kanchanaburi, Ratchaburi, Lopburi, Saraburi, Nakhon Nayok, Prachinburi, Sa Kaeo, Rayong, Chanthaburi, Trat, Phetchaburi, Prachuap Khiri Khan, Bangkok, and metropolitan area.
• Southern region (4 provinces): Chumphon, Ranong, Phang Nga, and Phuket.

Areas to monitor for strong winds and waves include:

• Central region: Chonburi (Mueang Chonburi, Si Racha, Ko Sichang, Bang Lamung, Sattahip), Rayong (Mueang Rayong, Ban Chang, Klaeng), Chanthaburi (Na Yai Am, Tha Mai, Laem Sing, Khlung), and Trat (Mueang Trat, Laem Ngop, Khlong Yai, Ko Chang, Ko Kut).
• Southern region: Ranong (Mueang Ranong, Suk Samran, Kapoe), Phang Nga (Ko Yao, Takua Thung, Thai Muang, Takua Pa, Kuraburi), and Phuket (all districts).

The DDPM has coordinated with provinces in risk areas and regional disaster prevention centers to closely monitor the situation and prepare for response. Officials will continuously track weather and water conditions, deploy Emergency Response Teams (ERT), and position disaster relief machinery in vulnerable areas to respond promptly and assist residents.

For natural tourist sites, especially caves and waterfalls, if there is risk of danger, warnings and barriers should be set to prevent entry. In areas with strong winds and waves, relevant agencies are urged to issue announcements or install warning signals along the coast to prohibit swimming and alert boat operators and passenger vessel companies to exercise caution. If conditions worsen, consideration should be given to banning navigation altogether. Regional disaster prevention centers should establish local War Rooms with staff on 24-hour alert to monitor and assist residents. Temporary shelters should be prepared with sufficient food, drinking water, and essential supplies in case evacuations are necessary. The public is urged to strictly follow official advice during warnings.

The public can follow disaster alerts via the mobile application "THA DISASTER ALERT" and can request assistance through the LINE application "DDPM Incident Reporting 1784" as well as the 24-hour emergency hotline 1784 for coordination of aid.