Heavy to Very Heavy Rain in upper Thailand No.9 (176/2026)

Weather Advisory

Subject: Heavy to Very Heavy Rain in upper Thailand

No.9 (176/2026)

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The monsoon trough will move to lie across the North and the upper Northeast into an active low-pressure cell over the coast of upper Vietnam and the Gulf of Tonkin. Meanwhile, the rather strong southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf. More rains and isolated heavy to very heavy rains are forecast in Thailand especially in the western part of the North and the Central, the upper part and the eastern part of the Northeast and the East regions. People in the country should beware of heavy to very heavy rains and accumulation that may cause flash floods, overflows and landslides especially along the waterways near foothills and lowlands.

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. In the lower Andaman Sea, the waves are expected about 2 meters high and above 2 meters high in thundershowers. All ships in the Andaman Sea and the Gulf should proceed with caution and keep off thundershowers, small boats in the upper Andaman Sea and the upper Gulf keep ashore.

                                     The advisory is in effect on 30 August 2026, at 5.00 p.m.
                                                This next issue will be on 31 August 2026, at 5.00 a.m.

                                                                 (Signed)    Sugunyanee Yavinchan

                                                                            (Miss Sugunyanee Yavinchan)                            

                                                                                      Director-General                        

                                                                          Thai Meteorological Department