Weather Advisory
Subject: Tropical Storm “NONGFA”
and heavy to very heavy rain in Thailand
No. 5 (228/2025)
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At 7.00 a.m.
LST (30 August 2025), tropical depression over the upper
of South China was intensified to tropical storm “NONGFA”. And at 10.00 a.m., it
was centered about 100 kilometers east of Quang Binh,
Vietnam or at latitude 17.9 degrees north and longitude 107.5
degrees east, with maximum sustained winds near the center at about 65 km/hr.
The storm is moving west with a speed of 25 km/hr. This storm is forecast to make
landfall over Quang Binh, Vietnam on afternoon, 30 Aug. It 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 Lam Phu, Kalasin,
Maha Sarakham, Roi Et,
Khon Kaen, Chaiyaphum, and Loei .
East:
Sa Kaeo, Chanthaburi, and
Trat.
South: Chumphon, Surat
Thani, Nakhon Si Thammarat, Ranong, Phangnga, Phuket, Krabi, and Trang.
31 August 2025
North:
Nan, Phrae, Uttaradit,
Phetchabun, Phitsanulok, Phichit, Sukhothai, Tak, Kamphaeng Phet, Chiang Mai, Lampang, Lamphun, and Mae Hong Son.
Northeast:
Nakhon Phanom, Sakon Nakhon,
Mukdahan, Bueng Kan, Nong Khai, Udon Thani,
Nong Bua
Lam Phu, Loei, Kalasin, Yasothon, Roi Et, Maha Sarakham,
Khon Kaen,
and Chaiyaphum.
Central: Lopburi,
Saraburi, Nakhon Sawan, and Uthai Thani.
East: Nakhon Nayok, Prachin Buri,
Rayong, Chanthaburi, and Trat.
South: Chumphon, Surat
Thani, Ranong, Phangnga, and Phuket.
1 September 2025
North:
Nan, Phrae, Uttaradit,
Phetchabun, Phitsanulok, Phichit, Sukhothai, Tak, Kamphaeng Phet, Chiang Mai, Lampang, Lamphun, and Mae Hong Son.
Northeast:
Nong Khai, Bueng Kan, Nong Bua
Lam Phu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Kalasin,
and Mukdahan.
Central:
Lopburi, Saraburi, Phra Nakhon
Si Ayutthaya, Nakhon Sawan, and Uthai Thani
East: Nakhon
Nayok, Prachin Buri, Chanthaburi, and Trat.
South: Prachuap Khiri Khan,
Chumphon, 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 a.m.
This
next issue will be on 30 August 2025, at 05.00 p.m.
(Signed) Sugunyanee Yavinchan
(Miss Sugunyanee
Yavinchan)
Director-General
Thai Meteorological Department
