Attachments
Key Messages
Key messages for this weekly report are presented below.
Rainfall monitoring and forecast
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In the period of 25 June - 01 July 2024, there has been light to heavy rainfall has been observed over the LMB. Especially, during 29 June – 01 July, heavy and very heavy rainfall has been observed over the LMB in Chiang Khan, Muong Mai, Ban Phone Si,
Muong Kao, and Prek Kdam. -
During 02 – 08 July 2024, the accumulated rainfall over the entire Lower Mekong Basin is distributed with light to heavy rain. Moderate rainfall is expected in the central part of Laos, the southwestern and northeastern parts of Cambodia, and the 3S Basin of Sekong, Sesan, and Srepok. However, heavy rainfall may likely occur in the upper part of the 3S Basin during 03–05 July.
Water level monitoring and forecast
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At 22 key monitoring stations along the Mekong mainstream from 25 June – 01 July 2024, water levels are normal, and the flow threshold (PMFM 6C) are under normal conditions. It is also the same condition for Tan Chau and Chau Doc monitoring stations, which are significantly influenced by sea tidal fluctuation.
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In the period of 02 – 06 July 2024, Water levels are forecasted to be slightly decreasing and stable at upper stretches of LMB from Chiang Saen to Khong Chiam stations. However, water level at other remaining stations from Pakse to Prek Kdam will rise except for Koh Khel and Neak Luong. At Tan Chau and Chau Doc stations, the water levels are predicted to be also fluctuated, resulting from the influence of sea tidal patterns. Water levels at most of the stations are expected to be below their long-term averages (LTAs) except for Luang Prabang station.
Drought condition and forecast
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During 25 June-1 July 2024, the LMB was st moderate drought in some areas of the middle and lower parts. Moderate drought specifically covered some areas of Kampong Cham, Kampongthom, Kratie, Mondulkiri, Prey Veng, Khammuan, Savanakhet, Salavan, Champasack, Sakon Nakhon, Kalasin, Mukdahan, Roi Et, Nakhon Ratchasima, and Gia Lai.
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From July to September 2024, it is expected to bring drought conditions to certain areas of the LMB. In July, eastern Cambodia, 3S area, and northern Lao PDR are the most severe areas. In August, severe and exceptional droughts are forecasted for the upper part of the LMB. Other areas are likely normal or wet. In September, moderate to severe drought is forecasted for the northern Cambodia and 3S area, while other areas are likely normal or wet. Severe drought is likely taking place in some areas of Otdar Meanchey, Preah Vihear, Stung Tremg, Ratanakiri, and Kampong Thom of Cambodia, Xekong and Attapu of Lao PDR and Kon Tum and Gia Lai of Viet Nam.