Bangkok: The Meteorological Department has issued a warning of heavy to very heavy rain anticipated in several regions, with potential flash floods, mudslides, and strong waves expected in the Andaman Sea and the upper Gulf of Thailand.
According to Thai News Agency, the Meteorological Department's Announcement No. 5 highlights the impact of a monsoon trough and a strong southwest monsoon affecting Thailand from July 19-24, 2025. This weather system is expected to bring significant rainfall to the North, Northeast, Central, East, and the West Coast of the South. Residents in these areas are urged to exercise caution due to the risk of flash floods and forest runoff, particularly in hillside and lowland areas.
On July 19, heavy rainfall is expected to impact provinces such as Nong Khai, Bueng Kan, and Ubon Ratchathani in the Northeast; Kanchanaburi and Saraburi in the Central region; and Rayong and Trat in the Eastern region. Southern provinces such as Prachuap Khiri Khan and Phuket will also experience significant rainfall.
The following day, July 20, will see the Northern region, including Chiang Rai and Phitsanulok, experiencing heavy rain along with provinces in the Northeast, Central, and Southern regions. The pattern continues into July 21, with the Northern provinces like Chiang Mai and Sukhothai, and Central areas including Bangkok, expected to face heavy downpours.
From July 22-24, Mae Hong Son, Chiang Mai, and Ubon Ratchathani, among others, are forecasted to experience continued heavy rainfall, further exacerbating the risk of natural disasters.
Additionally, the Andaman Sea and the upper Gulf of Thailand are expected to see strong waves, ranging from 2-3 meters high, with even higher waves in thunderstorm-prone areas. Sailors are advised to exercise caution, and small boats are recommended to avoid setting sail during this period.
Moreover, Tropical Storm 'Wipha' is anticipated to move into the upper South China Sea and is expected to make landfall in northern Vietnam around July 20-21.
The Meteorological Department advises the public to stay prepared for possible evacuations and to keep abreast of updates to ensure safety during this period of adverse weather conditions.