1. Review of Regional Weather Conditions in June 2016
1.1 The Southwest Monsoon season onset in June 2016 with prevailing winds over the region blowing mostly from the southeast or southwest. Showers affected most parts of the southern ASEAN region, particularly over Java and its surrounding areas.
1.2 While shower activities affected many parts of the ASEAN region in the first three weeks of June 2016, dry weather conditions were experienced, in particular over the southern ASEAN region in the last week of June 2016.
1.3 For June 2016, most parts of the northern ASEAN region except Cambodia and Lao PDR received near-normal to above-normal rainfall. In the southern ASEAN region, above-normal rainfall was received over Peninsular Malaysia, Kalimantan and Java. The regional rainfall distribution for June 2016 is shown in Figure Fig. 1A.
2. Review of Land/Forest Fires and Smoke Haze Situation
2.1 In June 2016, hotspot activities remained largely subdued in both northern and southern ASEAN regions due to persistent wet weather conditions. In the last week of June 2016, the dry weather conditions experienced in the region contributed to a slight increase in hotspot activities in Sumatra. There was no occurrence of transboundary smoke haze in June 2016. Satellite images in Figure 2A – 2E show shower activities over various parts of the ASEAN region in June 2016.
2.3 The hotspot charts for June 2016 for
- Cambodia, Myanmar, Thailand, Lao PDR and Vietnam;
- Sumatra, Borneo and Peninsular Malaysia;
3. Status of El Niño/La Niña
3.1 In June 2016, Niño3.4 sea-surface temperature (SST) readings were near zero, indicating Neutral (neither El Niño nor La Niña) conditions. Other atmospheric variables such as cloudiness and rainfall patterns in the central and eastern equatorial Pacific also indicate Neutral conditions.
3.2 Most international climate models and expert assessments project the Neutral condition to persist, with increasing possibility of La Niña conditions in the second-half of 2016. However, the possibility of Neutral conditions to persist for the rest of year 2016 cannot be ruled out.
3.3 The ASEAN region is currently in the Southwest Monsoon season (June-September/early October), where the La-Niña is known to have considerable impact (wetness) on the western part of the Maritime Continent.