General weather patterns
From 14 to 20 July 2020, there were no heavy rainfalls over the Lower Mekong Basin (LMB). The weather outlook bulletins for the 3 months (Jul-Aug-Sep) and weather maps issued by the Thailand Meteorology Department (TMD) were used to verify the weather condition in the LMB. They expect the low pressures of air mass cells will develop around the Mekong Region in the 3 rd week of this month, resulting aboveaverage rainfall in this period. They expected in August and September 2020, there will be some tropical cyclones move to dissipate nearby the LMB, which will have abundance of rainfall. Figure 1 presented the weather map on 19 July 2020.
According to the Asian Specialized Meteorological Centre (ASMC), the increased shower rainfall over the Mekong sub-region, above-normal rainfall and hotspot activities are happening in July 2020. In the southern ASEAN region, rainfall over most parts of the equatorial region is predicted to be above normal in July-August-September 2020.
Consequently, from July to August 2020, there will increasing chance of moderate rainfall to above average rainfall for most parts of the Asian countries especially in the Mekong region. Figure 2 showed the predicted rainfall in July 2020 in Southeast Asia, which showed the increased above-normal rainfall for the Mekong region.
Source: Mekong River Commission