Fire Weather Maps

Initial Spread Index

The Initial Spread Index is a component of the Canadian Forest Fire Weather Index (FWI) System. It is a numeric rating of the expected rate of fire spread. It combines the effects of wind and the Fine Fuel Moisture Code on rate of spread without the influence of variable quantities of fuel.

Forecasted weather data provided by Environment Canada. More information about forecasted weather is available in the Background Information.

More information about the Canadian Forest Fire Weather Index (FWI) System is available in the Background Information.

Maps updated daily, year-round.