Meteorological Conditions in South East Asia: 20 January 1999

Meteorological Conditions in SouthEast Asia

20 January 1999

The ASEAN Fire Weather Information System (ASFWIS) is a co-operation between ASEAN and the Canadian Forest Service. It provides maps describing the current fire weather situation in South East Asia. This system is based upon the Canadian Forest Fire Danger Rating System (CFFDRS) (for further infomation to the CFFDRS refer to, and is currently tested on an experimental basis. Studies have shown that the CFFDRS is applicable outside of Canada. Currently it is also used in a modified form in New Zealand (see References). In New Zealand  the Fire Weather Indices Fine Fuel Moisture Code (FFMC) and the Initial Spread Index (ISI) represent the fire danger in the scrublands. The Duff Moisture Code (DMC) is also applicable in South East Asia, because it potentially describes the moisture state of the upper peat layers in peat and peat swamp forests. All three parameters may serve as a suitable indicator of forest fire danger in South East Asia.

High Fire Danger in Northern Thailand

According to the ASFWIS ( for 19 January 1999 these parameters show various fire weather conditions over South East Asia.  The highest FFMC readings are recorded for northern Thailand, with the FFMC ranging between 90-92. Taking the DMC readings into account the fire danger ratings in northern Thailand indicate high fire danger for 19 January 1999. Due to substantial rainfall the fire danger in Indonesia is low, only on the Sulawesi Island at the city Palu, increasing fire danger rating (FFMC, ISI) can be observed.

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Fig.1. FFMC output of the ASFWIS

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 Fig.2. DMC output of the ASFWIS

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Fig.3. ISI output of the ASFWIS

These findings are consistent with the current weather reports from the weather web site wunderground ( which forecasts cloudy conditions for Indonesia with temperatures between 24°C (Pontianak) and 34°C (Palu) and relative humidity ranging from 49% up to 97%. The area around Palu on the Sulawesi Islands has 34°C with 49% relative humidity, the forecast for this particular region is 39°C with chance of thunderstorms. The general forecast for whole Indonesia is cloudy and rainy.

The Meteorological Service of Singapore ( reports on 19 January 1999 for the South East Asian region ” The region continues to experience wet monsoon conditions, and no significant smoke haze were observed. We expect the present conditions to maintain for the next few days. Northeast winds are expected to strenghten during the next few days”. The Meteorological Service states for the near future that: “rainfall in the region is expected to be near or above normal for the next few months. However it should be noted that many parts of Indonesia (Kalimantan and parts of Sumatera) would be in their traditional dry season in the next few months. As such, though extensive and prolonged smoke haze is unlikely for this period, occasional short periods (e.g. a few days) of slight to moderate haze in a more localised manner remain probable”.

No fire update information is currently provided by the Integrated Forest Fire Management (IFFM) project in Samarinda (East Kalimantan) and the Forest Fire Prevention and Control Project (FFPCP) in Palembang (Sumatera) (

Summary: Although the current fire weather conditions do under normal conditions not favour extensive land clearing by fire or escaping wildfires, the consequences of the large wildfires of 1997-98 must been taken into consideration. These fires had caused extensive degradation of primary and secondary forests along with the spreading of “alang-alang” (Imperata cylindrica) grasslands. These grasslands facilitate the spread of uncontrolled fires over large areas. It can be predicted that in November-December with only moderate fire danger new vegetation fires will occur.

See also the IFFN Country Notes.

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