Thailand’s Meteorological Department (TMD) has warned of thunderstorms, flash floods and rough seas as the monsoon brings heavy rain across several regions.
The monsoon trough lies across the lower Central, upper South and the East into an active low-pressure cell over the South China Sea, while a moderate southwesterly wind prevails over the Andaman Sea, the South and the Gulf of Thailand.
According to the TMD, scattered thunderstorms with isolated heavy rain are expected in the central region, including Bangkok, as well as in the East and the South. Officials caution that accumulated rainfall may trigger flash floods and overflowing waterways, particularly in low-lying areas and near foothills.
Waves in the upper Andaman Sea are forecast at around 2 metres, while the lower Andaman and upper Gulf will see waves of 1 to 2 metres, rising above 2 metres during thundershowers. Mariners have been urged to proceed with caution and avoid storm-prone areas.
The weather forecast from 6pm yesterday, September 16, to 6pm today, September 17, is as follows:
In the northern region, scattered thundershowers are expected, particularly in Mae Hong Son, Chiang Mai, Lamphun, Lampang, Tak, Sukhothai, Phitsanulok, Kamphaeng Phet, Phichit and Phetchabun. Temperatures will range from 22 to 25°C in the morning to highs of 31 to 34°C. Variable winds will blow at 5 to 15 km/h.
For Northeast Thailand, Chaiyaphum, Khon Kaen, Nakhon Ratchasima, Buriram, Surin, Sisaket, and Ubon Ratchathani will see scattered thundershowers. Morning temperatures will be 22 to 26°C, climbing to 33 to 34°C during the day. Southeasterly winds will reach 10 to 15 km/h.
In central Thailand, scattered thundershowers with isolated heavy rain are forecast in Uthai Thani, Phra Nakhon Si Ayutthaya, Kanchanaburi, Ratchaburi, Samut Songkhram, Samut Sakhon and Nakhon Pathom. Temperatures will range from 21 to 26°C in the morning to 31 to 34°C later in the day. Variable winds will blow at 10 to 15 km/h.
In the eastern region, fairly widespread thundershowers with isolated heavy rain are expected in Nakhon Nayok, Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat. Temperatures will start at 24 to 26°C, rising to 32 to 34°C. Variable winds at 15 to 35 km/h will push waves to 1 to 2 metres, rising above 2 metres in storms.
On the east coast in the South, scattered thundershowers with isolated heavy rain are forecast in Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani and Nakhon Si Thammarat. Morning temperatures will be 23 to 25°C, with highs of 32 to 35°C. Southwesterly winds will blow at 15 to 30 km/h, bringing waves of around 1 metre, rising to 2 metres offshore during storms.
On the west coast, scattered thundershowers with isolated heavy rain are expected in Ranong and Phang Nga. Morning lows will be 24 to 25°C, climbing to 30 to 34°C during the day. From Phuket northward, southwesterly winds will blow at 20 to 35 km/h, with waves around 2 metres and higher in storms. From Krabi southward, winds of 15 to 35 km/h will bring waves of 1 to 2 metres, exceeding 2 metres during thundershowers, according to the TMD.
For Bangkok and its surrounding areas, expect to see scattered thundershowers with isolated heavy rain. Morning lows will be 24 to 25°C, rising to highs of 32 to 33°C. Variable winds will blow at 10 to 15 km/h.
The TMD urges residents to remain vigilant for flash floods and rising waterways, while advising all vessels to avoid storm-prone areas until conditions improve.
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