Heavy to Very Heavy Rain in upper Thailand No.2 (156/2026)

Weather Advisory

Subject: Heavy to Very Heavy Rain in upper Thailand

No.2 (156/2026)

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During 18-21 August 2026, the monsoon trough will lie across the North and the upper Northeast. Meanwhile, the rather strong southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf with isolated heavy to very heavy rains in Thailand especially in the North and the Northeast. 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.

During 19-21 August 2026, the rather strong wind forces the waves in the upper Andaman Sea up to 2-3 meters high and above 3 meters high in thundershowers. In the lower Andaman Sea and upper Gulf,
the waves are 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 should keep ashore.

                                     The advisory is in effect on 16 August 2026, at 5.00 a.m.
                                                This next issue will be on 16 August 2026, at 5.00 p.m.

                                                                 (Signed)    Sugunyanee Yavinchan

                                                                            (Miss Sugunyanee Yavinchan)                            

                                                                                      Director-General                        

                                                                          Thai Meteorological Department