Heavy Rain Alert for Thailand's North and Northeast Through August 21

The Thai Meteorological Department issued warning number nine on August 19 regarding extremely heavy rainfall in Thailand's northern and northeastern regions through August 21, 2569, driven by southwest monsoons affecting the upper north and northeast alongside southwestern winds over the Andaman Sea and Gulf of Thailand. Authorities warn of sudden flash floods and flash floods, especially in sloped terrain near waterways and low-lying areas, and advise against traveling through repeatedly flood-prone routes and low-lying zones where water may accumulate rapidly. Wave heights in the upper Andaman Sea and upper Gulf of Thailand are forecast at 2–3 meters, exceeding 3 meters in thunderstorm areas, while the lower Andaman Sea expects waves around 2 meters or higher during storms. Boat operators are urged to exercise caution and avoid thunderstorm zones; small boats in the upper Andaman and upper Gulf should remain ashore. The public is encouraged to plan activities and travel carefully and monitor updates from the Thai Meteorological Department at www.tmd.go.th or by calling 0-2399-4012-13 and 1182. Affected provinces on August 19 include Mae Hong Son, Lampang, Nan, Phrae, Uttaradit, Phitsanulok, and Phetchabun in the north; Loei, Nong Khai, Bueng Kan, Udon Thani, Sakon Nakhon, Nakhon Phanom, Kalasin, and Mukdahan in the northeast; and Trat in the east, with additional provinces expecting heavy rain. On August 20, extremely heavy rain is expected in Mae Hong Son, Chiang Mai, Lampang, Nan, Phrae, Uttaradit, Tak, Phitsanulok, and Phetchabun in the north; Loei, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Sakon Nakhon, and Nakhon Phanom in the northeast; Kanchanaburi in the central region; and Trat in the east.