Review of Regional Weather and Smoke Haze for Dec 2014

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1.   Review of Regional Weather Conditions in December 2014

1.1    Moderate Northeast Monsoon season was established in the region in December 2014, bringing dry and cool weather to most parts of the Mekong Sub-region of Cambodia, Lao PDR, Myanmar, northern Thailand and Vietnam. In the southern ASEAN region, the prevailing rainy season affected most parts of the southern ASEAN region.

1.2    Super Typhoon ‘Hagupit’ which was the most intense tropical cyclone of the year, developed to the east of the Philippines in the last week of November 2014. It strengthened as it tracked westwards, making landfall over the provinces of Samar and Masbate in the Philippines on 6 and 7 December 2014 respectively. ‘Hagupit’ weakened rapidly after making landfall and dissipated rapidly over the South China Sea, southeast of Vietnam. On 29 December 2014, another Tropical Storm ‘Jangmi’ affected the Philippines, making landfall over Mindanao. ‘Jangmi’ tracked across the Philippines before dissipating over South China Sea. Both ‘Hagupit’ and ‘Jangmi’ affected up to a million people, and destroying hundreds of houses along their path.

1.3    On 13 January 2015, Typhoon “Mekkhala” developed over the Western Pacific Ocean, and continued its westward track afecting the eastern part of Luzon and Visayas in the Philippines a few days later. Typhoon “Mekkhala” made landfall near eastern Samar, the Philippines on 17 January 2015, and weakened rapidly into a tropical depression as it moved north-eastwards, dissipating over water on 21 January 2015 away from Luzon Islands.

1.4    During the second half of December 2014, the strengthening of north-easterly winds over the South China Sea, or a monsoon surge, affected the region on a few occasions. The monsoon surges brought wet and windy conditions to parts of the southern ASEAN region. Continuous heavy showers of rain fell over most parts of Peninsular Malaysia, and led to severe flooding in the eastern coastal States of Terengganu, Pahang, and Kelantan with around 250,000 people displaced from their homes. Several districts in Indonesia and southern Thailand were also affected by floods due to the several days of continuous rainfall.

1.5    In December 2014, many parts of the southern ASEAN region received more than 100% of normal rainfall with the exception of southern Sumatra and western Borneo where less than 100% of normal rainfall was received. In contrast, most parts of the northern ASEAN region such as Thailand, Myanmar and Cambodia received less than 50% normal rainfall. Many parts of the Philippines received more than 125% of normal rainfall due to the passage of Super Typhoon ‘Hagupit’ and Tropical Storm ‘Jangmi’. The regional rainfall distribution for December 2014 is shown in Fig. 1A.

Fig. 1A: Percentage of Normal Rainfall for December 2014


2.   Review of Land/Forest Fires and Smoke Haze Situation

2.1    Wet weather conditions in December 2014 continued to keep hotspot activities in the southern ASEAN region subdued. For the northern ASEAN region, the onset of the traditional dry season brought an increase in hotspot activities, mainly in Cambodia, Myanmar, Thailand and Vietnam. Satellite images depicting some of the hotspot activities over the ASEAN region in December 2014 are shown in Figs. 2A to 2E.


Fig. 2A: NOAA-18 satellite picture on 8 December 2014 shows subdued hotspot activities in Sumatra due to the prevailing wet weather.


Fig. 2B: NOAA-18 satellite picture on 9 December 2014 showing the emergence of increased hotspot activities in northern ASEAN.

Fig. 2C: NOAA-18 satellite picture on 15 December 2014 showing an increase in hotspot activities in Thailand due to the drier weather conditions.


Fig. 2D: NOAA-18 satellite picture on 24 December 2014 showing the occurrence of isolated hotspot activities in Myanmar.

Fig. 2E: NOAA-18 satellite picture on 27 December 2014 shows an increase in hotspots in the Cambodia.


2.2    The hotspot charts for December 2014 for

  1. Cambodia, Myanmar, Thailand, Lao PDR and Vietnam;
  2. Sumatra, Borneo and Peninsular Malaysia; and
  3. Java, Sulawesi and the Philippines

are shown in Figs. 2F to 2H respectively


Fig. 2F: Hotspot Counts in Cambodia, Lao PDR, Thailand, Vietnam, Myanmar for December 2014.


Fig 2G: Hotspot Counts in Sumatra, Borneo and Peninsular Malaysia for December 2014.


Fig. 2H: Hotspot Counts in Java, Sulawesi, Philippines for December 2014.