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This value represents the daily FWI value at which 10% of all interpolated observations at that location exceed the value identified.These were calculated by interpolating daily weather records from the network of active and archived BC Wildfire Service and other (e.g. Environment Canada, BC Ministry of Environment SnowPillow, etc. ) weather stations.The head fire intensity (90th percentile) values were classified using accepted thresholds of fire intensity and fire suppression effort. The head fire intensity classes used in the final threat layer are different from the defined head fire intensity classes derived from the Fire Behaviour Prediction System because the values need to be spread across 10 categories. The intensity values in the HFI data layer therefore represent daily peak burning head fire intensity values representative of a small number of days (~ 1-15) in an average year based on the fuels identified in provincial inventory in early 2017. By definition, these represent high to extreme values for any given location. The final classification scheme for the HFI (90thpercentile weather) layer was chosen to represent accepted fire intensity thresholds (in kW/m) associated with suppression difficulty, along with some additional classes added to further discriminate between intensity levels at the high end (i.e. crown fires).Water bodies were overlaid on the raster and assigned their own class, -1. Aprivate managed forest land (PMFL) and private land (PL) mask was applied to the data due to fuel typing limitations in these areas. Each of these were given their own class. PMFL is class -2 and PL is class -3.For more information please see the Provincial Strategic Threat Analysis PSTA Report. Feature class name is 'WHSE_LAND_AND_NATURAL_RESOURCE.PROT_PSTA_HEAD_FIRE_INTNSTY_SP'. 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