Summer Thunderstorm in the upper Thailand and heavy rains in the South (Effect during 9-12 May 2025) No.4 (113/2025)

Weather Advisory

Subject: Summer Thunderstorm in the upper Thailand

and heavy rains in the South

(Effect during 9-12 May 2025)

No.4 (113/2025) 

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The moderate high-pressure system from China will extend to Vietnam and the South China Sea. The southerly and southeasterly winds bring the moisture from the South China Sea and the Gulf to the upper Thailand where hot to very hot weather occurs. Outbreaks of summer storms are possible following thunderstorms, gusty wind, hail, and heavy rains including lightning strikes are likely in some areas of the Northeast at first then the rest regions.

Affected areas are as follows

9 May 2025 

Northeast: Loei, Nong Bua Lam Phu, Udon Thani, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Khon Kaen, Maha Sarakham, Kalasin, Mukdahan, Roi Et, Yasothon, Amnat Charoen, and Ubon Ratchathani.

10 May 2025

North: Nan, Phrae, Uttaradit, Phichit, Phitsanulok, and Phetchabun.

Northeast: Loei, Nong Khai, Bueng Kan, Nong Bua Lam Phu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Kalasin, Khon Kaen, Mukdahan, Maha Sarakham, Roi Et, Yasothon, Amnat Charoen, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket, and Ubon Ratchathani.

Central: Nakhon Sawan, Uthai Thani, Chai Nat, Lop Buri, Saraburi, Sing Buri, Ang Thong, Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, including Bangkok and its vicinity

East: Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat.

11 May 2025

North: Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Phrae, Uttaradit, Sukhothai, Kamphaeng Phet, Phichit, Phitsanulok, Phetchabun, and Tak

Northeast: Loei, Nong Bua Lam Phu, Chaiyaphum, Khon Kaen, Maha Sarakham, Roi Et, Yasothon, Amnat Charoen, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket, and Ubon Ratchathani

Central: Nakhon Sawan, Uthai Thani, Chai Nat, Lop Buri, Saraburi, Sing Buri, Ang Thong, Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, and Samut Songkhram, including Bangkok and its vicinity

East: Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat

South: Phetchaburi, Prachuap Khiri Khan

12 May 2025

North: Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phrae, Uttaradit, Tak, Sukhothai, Kamphaeng Phet, Phichit, Phitsanulok, and Phetchabun

Northeast: Chaiyaphum, Nakhon Ratchasima, Buri Ram, and Surin

Central: Nakhon Sawan, Uthai Thani, Chai Nat, Lop Buri, Saraburi, Sing Buri, Ang Thong, Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon, and Samut Songkhram, including Bangkok and its vicinity

East: Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat

South: Phetchaburi, Prachuap Khiri Khan, and Chumphon

People in the upper country should beware of the thunderstorm with gusty winds, hails and strikes by keeping off outdoor places, big trees and unsecured billboards including should beware of severe conditions and accumulated rain that may cause flash flood and overflows, especially along the waterways near foothills and lowlands. Farmers should prevent for crops damage. People in the upper country should keep healthy due to the variable weather.

The southwesterly wind prevailing over the Andaman Sea and the South is strengthening with more rain and isolated heavy rains in Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Ranong, Phang Nga, Phuket, Krabi and Trang during 10-12 May 2025. People in the South should beware of heavy rains and accumulation that may cause flash floods and overflows, especially along the waterways near foothills and lowlands. The strengthening wind forces the waves in the Andaman Sea up to 1-2 meters high and above 2 meters high in thundershowers. All ships should proceed with caution and keep off thundershowers.

This advisory is in effect on 9 May 2025, at 5.00 a.m.

This next issue will be on 9 May 2025, at 5.00 p.m.

(Signed)    Sugunyanee Yavinchan

(Miss Sugunyanee Yavinchan)

Director-General

Thai Meteorological Department