Weather Advisory
Subject: Tropical Storm “NONGFA”
and heavy to very heavy rain in Thailand
No. 7 (230/2025)
------------------------
At 7.00 p.m.
LST (30 August 2025), tropical storm “NONGFA” over Khammouane Province, Laos was
downgraded to tropical depression. At 8.00 p.m. LST, it was downgraded to an
active low-pressure cell over Nakhon Phanom Province. And at 10.00 p.m. LST, it
moves to covers Nong Khai. It is forecast to move through the monsoon trough
that lie across over the North and the Northeast of Thailand during 30 - 31
Aug.
This system will bring increased rainfall across Thailand from 30 August
- 1 September, with heavy to very heavy rainfall in many areas, accompanied by
strong winds in the northeastern region, particularly in the provinces of Nakhon Phanom, Sakon Nakhon, Mukdahan, Bung Kan, Nong Khai, Loei, Udon Thani,
Nong Bua Lam Phu, Kalasin, Khon Kaen, and Chaiyaphum. The northern and
upper-central regions will be affected by 31 August, especially in the lower
provinces of Nan, Phrae, Uttaradit, Phetchabun, Phitsanulok, Phichit,
Sukhothai, Tak, Kamphaeng Phet, Chiang Mai, Lampang, Lamphun, Mae Hong Son, and
Nakhon Sawan. People in the country should beware of heavy to very heavy rain,
strong wind and accumulation that may cause flash floods and overflows
especially along the waterways near foothills and lowlands.
Affected areas
are as followings
30 August 2025
North:
Nan, Phrae, Uttaradit,
Phitsanulok, Phichit, and Phetchabun.
Northeast:
Nakhon Phanom, Sakon Nakhon,
Mukdahan, Bueng Kan, Nong Khai, Yasothon,
Amnat Charoen,
Ubon Ratchathani, Udon Thani, Nong Bua Lamphu, Kalasin,
Maha Sarakham,
Roi Et, Khon Kaen, Chaiyaphum, Loei, and Nakhon Ratchasima.
Central: Nakhon Sawan, Lopburi, and
Kanchanaburi.
East: Sa Kaeo, Chanthaburi, and Trat.
South: Chumphon, Surat
Thani, Nakhon Si Thammarat, Ranong, Phangnga, Phuket, Krabi, and Trang.
31 August 2025
North:
Nan, Uttaradit, Phitsanulok,
Phichit, Phetchabun, Chiang Rai, Phayao, Phrae,
Lampang, Sukhothai,
Kamphaeng Phet, Chiang Mai, Lamphun, Tak, and Mae Hong Son.
Northeast: Nong Khai, Udon Thani,
Nong Bua Lamphu, Khon Kaen,
Loei, Chaiyaphum, and
Nakhon Ratchasima.
Central:
Lopburi, Nakhon Sawan, Uthai
Thani, and Kanchanaburi.
East: Nakhon Nayok, Prachin Buri,
Rayong, Chanthaburi, and Trat.
South: Chumphon, Surat
Thani, Ranong, Phangnga, Phuket, and Krabi.
1 September 2025
North:
Nan, Uttaradit, Phitsanulok,
Phichit, Phetchabun, Chiang Rai, Phayao, Phrae,
Lampang, Sukhothai,
Kamphaeng Phet, Chiang Mai, Lamphun, Tak, and Mae Hong Son.
Northeast:
Nong Khai, Bueng Kan, Nong Bua
Lamphu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Chaiyaphum,
Mukdahan, Amnat Charoen, Nakhon Ratchasima, and Ubon Ratchathani.
Central:
Kanchanaburi and Ratchaburi.
East: Nakhon
Nayok, Prachin Buri, Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat.
South: Prachuap Khiri Khan,
Chumphon, Surat Thani, Ranong, Phangnga, Phuket, and Krabi.
The southwest monsoon over the Andaman Sea, Thailand, and the Gulf of
Thailand will strengthen, leading to heavy rainfall in the eastern and western
southern regions of Thailand. The rather strong wind forces the waves in the
upper Andaman Sea and the upper Gulf up to 2-3 meters high and above 3 meters
high in thundershowers. All ships should proceed with caution and keep off
thundershowers, small boats in the upper Andaman Sea and the upper Gulf should
keep ashore and people along the coast of the East and the upper South west
coast should beware of storm surge during 30 August - 2 September.
This
advisory is in effect on 30 August 2025, at 11.00 p.m.
This
next issue will be on 31 August 2025, at 05.00
a.m.
(Signed) Sugunyanee Yavinchan
(Miss Sugunyanee
Yavinchan)
Director-General
Thai Meteorological Department
