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Mekong River Wetness Anomalies in the 2019 Monsoon Season

Detailed Analysis of the Monthly Wetness Index from May to October 2019

In summary, the wet season of 2019 was relatively average in the upper Mekong basin. The region started with slight dryness in May, pronounced dryness in June, near average wetness in July, slightly wetter than average in August and September, followed by pronounced wet conditions in October. Consequently, the model prediction of flow is near to slightly above average for the season. Therefore, the natural annual cycle present in all the previous years should have been observed at the Chiang Saen gauge. However, the natural flow from the upper Mekong basin was greatly impeded.

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