TECHNICAL GUIDE / 2025-09
The 2025 Update to the FWI System: Structure, Changes and Interpretation
The FWI2025 update is part of a broader initiative to modernize the Canadian Forest Fire Danger Rating System (CFFDRS). An enhanced calculation methodology allows the use of higher resolution data within a consistent and scientifically sound framework, while maintaining the simplicity of the current FWI System (FWI1987). This document informs experienced users, particularly operational agencies, about the modifications in the FWI2025. It guides users in interpreting and utilizing the outputs generated by the updated system in their operational planning. The FWI2025's improvements provide a more accurate and flexible tool for daily fire danger assessment, enhancing the effectiveness of fire management strategies.
Authors
- Gabrielle Ayres
- Jonathan Boucher
- Luke Collins
- Anne Cotton-Gagnon
- Patrick Deane
- Chelene Hanes
- Natasha Jurko
- Sam Lacarte
- Daniel Perrakis
- Mackenzie Simpson
- Steve Taylor
- Dan Thompson
- Derek Van Der Kamp
- Mike Wotton
Organizations
- Natural Resources Canada