How to interpret FWI
Higher FWI values generally indicate greater potential fire intensity if a fire is burning. FWI is a technical numeric index; it is distinct from the public Low-to-Extreme Fire Danger agency classes shown on FireRadar's Fire Danger pages.
Fire weather is context, not a local prediction
FWI does not prove that a wildfire has started, predict an ignition or evacuation, or provide a property-specific risk assessment. Actual fire behaviour also depends on fuels, terrain, weather and the incident itself.
How FWI fits into CFFDRS
Canada's Fire Weather Index System connects weather observations to fuel-moisture codes and fire-behaviour indices. FireRadar keeps each component separate so users can see what is actually being measured or derived instead of receiving an opaque combined risk score.
Compare the public Low-to-Extreme Fire Danger classes →Use official operational guidance for decisions
CWFIS products are broad national fire-weather guidance. Provincial, territorial, Indigenous, municipal and Parks Canada authorities remain responsible for operational fire danger, restrictions, wildfire response and emergency decisions.
Official methodology and source
FireRadar shows the Natural Resources Canada CWFIS layer using its published colours and symbols. When a value is unavailable, FireRadar leaves it unavailable rather than estimating a property-level risk.