Subseasonal Weather Outlook (1- 15 December 2019)

Issued 3 December 2019
Valid for weeks 1 and 2: 1 – 15 December 2019


Figure 1: Rainfall Outlook


Figure 2: Temperature Outlook


In the first fortnight of December 2019, wetter conditions are expected over the western Maritime Continent, including central Sumatra, Peninsular Malaysia, Singapore and parts of western Borneo.

In Week 1, wetter conditions are forecast for the Philippines as Typhoon Kammuri continues its track northwest during the period.

Over the other parts of the ASEAN region including most parts of the Mekong sub-region and the eastern Indonesian Archipelago, it is forecast to be dry.

With a surge of cool air from the northern Asian landmass expected to blow toward the Equatorial Southeast Asia region, the Mekong sub-region, South China Sea and the surrounding areas, including Peninsular Malaysia and parts of Sumatra can expect cooler temperatures during the outlook period. In contrast, warm conditions are forecast over the Indonesian Archipelago around the Java Sea region. These conditions are expected to ease slightly in Week 2.

The outlook is assessed for the region in general. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.