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| Class Ignition Potential | 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. |
- All maps are to be used solely for displaying meteorological/geophysical information, and not for any other purpose. All maps are not to scale and for illustrative purpose only.
- The ISI is a measure of the head fire indicator and rate of fire spread. The higher ISI index indicates higher difficulty of control in grassland. It is a combination of the effects of the wind speed and Fine Fuel Moisture Code.
- Image courtesy of the Malaysian Meteorological Department.