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c) Drought Code (DC)

The DC values shown on the map are indicative values of the moisture content of a deep layer of compact organic matter. Peat soil is an example of deep compact organic soil. The DC is used to indicate the potential for fire to smoulder in peat which is the primary cause of smoke and haze in Southeast Asia. It can also be used as an indicator of difficulty in extinguishing deep burning peat fires as well as an early warning indicator of serious haze events.

For the interpretation of the map, please refer to the table below :-

Class-Smoke Potential Interpretation
Low Typical wet-season conditions and severe haze periods are unlikely. More than 30 dry days until DC reaches threshold at which point severe haze is highly likely.
Medium Normal mid dry-season conditions. Between 15 and 30 dry days until DC reaches threshold. Burning should be regulated and monitored as usual.
High Normal dry season peak conditions. Between 5 and 15 dry days until DC reaches threshold. All burning in peatlands should be restricted. Weather forecast and seasonal rainfall assessments should be monitored closely for signs of an extended dry season.
Extreme Approaching disaster-level drought conditions. Less than 5 dry days until DC reaches threshold, at which point severe haze is highly likely. Complete burning restriction should be enforced.

 

d) Initial Spread Index (ISI)

The ISI is an indicator of the head fire indicator, rate of fire spread, and for difficulty of control in grasslands. It is a combination of the effects of the wind speed and FFMC.

For the interpretation of the map, please refer to the table below :-

Class-Difficulty of Control Interpretation
Low Fires will be self-extinguishing.
Medium Fire can be easily suppressed with hand tools.
High Most fire can be successfully controlled using power pumps and hose.
Extreme Some fires will be difficult to control.

Low = 0 - 1      Moderate = 2 - 3      High = 4 - 5      Extreme >5

 

e) Fire Weather Index (FWI)

The FWI values shown on the map are numerical ratings of fire intensity and general fire danger across the landscape that combine the ISI and BUI. This index is often used to indicate the difficulty of fire control based on the head fire intensity and fire fighting capability.

For the interpretation of the map, please refer to the table below :-

Class-Difficulty of Control Interpretation
Low

Low fire intensity. Fire will spread slowly or be self-extinguishing. Grassland fires can be successfully controlled using hand tools.

Medium Moderate fire intensity in grass. Hand tools will be effective along the fire's flanks, but water under pressure (pumps, hose) maybe required to suppress the head fire in grasslands.
High High fire intensity in grass. Direct attack at the fire's head will require water under pressure, and mechanized equipment may be required to build control lines. (e.g: bulldozer)
Extreme Very high fire intensity in grass. Fire control will require construction of control lines by mechanized equipment and water under pressure. Indirect attack by back-burning between control lines and the fire may be required.

Low = 0 - 1      Moderate = 2 - 6      High = 7 - 13      Extreme >13

 

Acknowledgement

The generation of SEA FDRS products are made possible through the cooperation and agreement with the Canadian International Development Agency (CIDA) and Canadian Forest Service (CFS)

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