1.0 DCPLUS 20251008 18511700 20251008 18511700 https://www.arcgis.com/home/item.html?id=494113254a694f9a8d8d381fa822041d 494113254a694f9a8d8d381fa822041d Feature Service https://services.arcgis.com/yzB9WM8W0BO3Ql7d/arcgis/rest/services/FireIntensityScale_COWRA22_Poly/FeatureServer FireIntensityScale_COWRA22_Poly 2025-10-08T18:51:17 2025-10-08T18:51:18 Fire Intensity Scale (FIS) specifically identifies areas where significant fuel hazards and associated dangerous fire behavior potential exist. Similar to the Richter scale for earthquakes, FIS provides a standard scale to measure potential wildfire intensity. From the 2022 Colorado Wildfire Risk Assessment (CO-WRA): https://co-pro.coloradoforestatlas.orgVectorized version of the 2022 Fire Intensity Scale Tiled Imagery Layer from Colorado Wildfire Risk Assesment <p style='background-color:rgb(254, 254, 254); border:0px solid currentcolor; box-sizing:inherit; color:rgb(0, 12, 52); font-family:Roboto, Helvetica, Arial, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 0.75rem; padding:0px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>Fire Intensity Scale (FIS) specifically identifies areas where significant fuel hazards and associated dangerous fire behavior potential exist. Similar to the Richter scale for earthquakes, FIS provides a standard scale to measure potential wildfire intensity. FIS consist of five (5) classes where the order of magnitude between classes is ten-fold. The minimum class, Class 1, represents very low wildfire intensities and the maximum class, Class 5, represents very high wildfire intensities.<ol><li>Class 1, Lowest Intensity: Very small, discontinuous flames, usually less than 1 foot in length; very low rate of spread; no spotting. Fires are typically easy to suppress by firefighters with basic training and non-specialized equipment.</li><li>Class 2, Low-Moderate: Small flames, usually less than two feet long; small amount of very short-range spotting possible. Fires are easy to suppress by trained firefighters with protective equipment and specialized tools.</li><li>Class 3, Moderate: Flames up to 8 feet in length; short-range spotting is possible. Trained firefighters will find these fires difficult to suppress without support from aircraft or engines, but dozer and plows are generally effective. Increasing potential for harm or damage to life and property.</li><li>Class 4, Moderate-High: Large Flames, up to 30 feet in length; short-range spotting common; medium range spotting possible. Direct attack by trained firefighters, engines, and dozers is generally ineffective, indirect attack may be effective. Significant potential for harm or damage to life and property.</li><li>Class 5, Highest Intensity: Very large flames up to 150 feet in length; profuse short-range spotting, frequent long-range spotting; strong fire-induced winds. Indirect attack marginally effective at the head of the fire. Great potential for harm or damage to life and property.</li></ol><p style='background-color:rgb(254, 254, 254); border:0px solid currentcolor; box-sizing:inherit; color:rgb(0, 12, 52); font-family:Roboto, Helvetica, Arial, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 0.75rem; padding:0px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'> <p style='background-color:rgb(254, 254, 254); border:0px solid currentcolor; box-sizing:inherit; color:rgb(0, 12, 52); font-family:Roboto, Helvetica, Arial, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 0.75rem; padding:0px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>Wildfire Threat and Fire Intensity Scale are designed to complement each other. Unlike Wildfire Threat, the Fire Intensity Scale does not incorporate historical occurrence information. It only evaluates the potential fire behavior for an area, regardless if any fires have occurred there in the past. This additional information allows mitigation planners to quickly identify areas where dangerous fire behavior potential exists in relationship to nearby homes or other valued assets.<p style='background-color:rgb(254, 254, 254); border:0px solid currentcolor; box-sizing:inherit; color:rgb(0, 12, 52); font-family:Roboto, Helvetica, Arial, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 0.75rem; padding:0px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>Since all areas in Colorado have fire intensity scale calculated consistently, it allows for comparison and ordination of areas across the entire state. For example, a high fire intensity area in Eastern Colorado is equivalent to a high fire intensity area in Western Colorado.<p style='background-color:rgb(254, 254, 254); border:0px solid currentcolor; box-sizing:inherit; color:rgb(0, 12, 52); font-family:Roboto, Helvetica, Arial, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 0.75rem; padding:0px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>Fire intensity scale is a fire behavior output, which is influenced by three environmental factors - fuels, weather, and topography – and the spread itself (back, flank or head fire influences fire behavior for a given pixel for a specific fire simulation). Weather is by far the most dynamic variable as it changes frequently. Thus, each pixel may burn many times with different fire spread patterns based on the aforementioned factors. The fire intensity scale maps represent an average fire intensity map.<p style='background-color:rgb(254, 254, 254); border:0px solid currentcolor; box-sizing:inherit; color:rgb(0, 12, 52); font-family:Roboto, Helvetica, Arial, sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 0.75rem; padding:0px; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>The fire intensity scale map is derived at a 20-meter resolution. This scale of data was chosen to be consistent with the accuracy of the primary surface fuels dataset used in the assessment. While not appropriate for site specific analysis, it is appropriate for regional, county or local planning efforts. 494113254a694f9a8d8d381fa822041d https://services.arcgis.com/yzB9WM8W0BO3Ql7d/arcgis/rest/services/FireIntensityScale_COWRA22_Poly/FeatureServer Feature Service