Weather Advisory
Subject: Tropical Storm “NONGFA”
and heavy to very heavy rain in Thailand
No. 6 (229/2025)
------------------------
At 3.00 p.m.
LST (30 August 2025), tropical storm “NONGFA” was made
landfall over Ha Tinh, Vietnam. And at 4.00 p.m. LST, it was centered about 180
kilometers east of Bueng Khong Long District, Bueng Kan Province or at latitude 17.9 degrees north and longitude 105.8
degrees east, with maximum sustained winds near the center at about 75 km/hr., is
moving west with a speed of 25 km/hr. This storm is likely to downgrade to
tropical depression and will move to upper Laos after that it is forecast to
downgrade to an active low-pressure cell and will 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 05.00 p.m.
This
next issue will be on 30 August 2025, at 11.00 p.m.
(Signed) Sugunyanee Yavinchan
(Miss Sugunyanee
Yavinchan)
Director-General
Thai Meteorological Department
