An Analysis of NFIRS Data for Selected Wildfires
Including Impacts in Wildland Urban Interface Areas

Executive summary

The 6 wildfires were selected by the U.S. Fire Administration (USFA) to reflect a diversity of wildland urban interface (WUI) conditions, land management responsibilities, locations, terrains and climates:

• Chimney Tops 2, Tennessee, 2016.
• Northwest Oklahoma Complex, Oklahoma/Kansas, 2017.
• West Mims, Georgia/Florida, 2017.
• Spring Creek, Colorado, 2018.
• Woolsey, California (Southern), 2018.
• Camp, California (Northern), 2018.

Overall, the data in the NFIRS for these wildfires significantly understates the publicly reported losses except for acres burned, which was often overreported in the NFIRS (Table 1).

For 3 of the wildfires — Chimney Tops 2, Woolsey and Camp — over one-quarter of the area affected by the fire was WUI. For purposes of this report, WUI areas are defined as census tracts where housing density is greater than 1 housing unit per 40 acres and either half the census tract is vegetation or it is within 1.5 miles of a large area (over 1,235 acres) that is at least 75% vegetated.³ Notably, the number of fire incidents reported to the NFIRS had no relationship to the share of the affected area that was WUI. In other words, wildfires with high WUI shares may be expected to have a larger number of NFIRS reports, but this was not the case (Figure 1).

³ Stewart, S. I., Radeloff, V. C., Hammer, R. B., & Hawbaker, T. J. (2007, June). Defining the wildland–urban interface. Journal of Forestry, 201-207. silvis.forest.wisc.edu/wp-content/uploads/2018/10/Stewart-et-al-JOF-2007.pdf

Within the wildfire boundaries of the Chimney Tops 2, Woolsey and Camp fires, most of the NFIRS-reported incidents were from within WUI areas (Table 2). This reinforces the principle that extra attention should be placed on planning for wildfires in WUI areas. However, in the Woolsey and Camp fires, far more incidents were reported to NFIRS from outside the wildfire boundary. Some of these incidents may have actually occurred within the wildfire boundary but lacked precise address information for accurate geocoding. Others — particularly emergency medical services (EMS) and other incidents — may have been service calls related to the wildfire.

This analysis compares how each of the wildfires was reported by local fire departments in the NFIRS. Each wildfire is reported quite differently:

• Chimney Tops 2: 98% of the NFIRS incidents from within the fire boundary were fires, and nearly all of these were exposure fires from a natural vegetation fire. There were nearly 2,500 NFIRS reports for this wildfire from over 50 different fire departments. Most of the exposure fire reports were identical except for the amount of property loss.
• Northwest Oklahoma Complex: Similar to Chimney Tops 2, 96% of the NFIRS incidents from within the fire boundary were fire incidents, and this wildfire also included a significant number of exposure reports. While there were fewer reports than Chimney Tops 2 overall (330 total) from a similar number of fire departments, they did not complete the optional fields in the Fire module to the same degree. Also, “property loss” was frequently left blank.
• West Mims: Most of the fire boundary was within the Okefenokee National Wildlife Refuge, under the jurisdiction of the U.S. Fish and Wildlife (FWS) Service. As such, there were only 2 NFIRS reports for this fire from within the fire boundary. Outside the fire boundary, the Fire module was used by local fire departments to report additional information about a number of fires despite the fact that a majority of those fires were natural vegetation fires where the Wildland Fire module could have been used.
• Spring Creek: The Spring Creek fire had the fewest NFIRS reports among the 6 wildfires. Portions of this fire occurred in areas managed by the Bureau of Land Management (BLM), which does not contribute data to the NFIRS. It also appears that a portion of this fire fell within the jurisdiction of a nonreporting local fire department, where most of the damaged and destroyed structures were located. In addition, all the fires that were reported to the NFIRS for the Spring Creek wildfire used the Wildland Fire module.
• Woolsey: The primary responsibility for combating fires in California is divided between federal, state and local authorities based on geographic area. A significant portion of the area affected by this wildfire (including WUI areas) was outside local direct protection areas. Only 7% of the NFIRS incidents recorded for the Woolsey fire were fires, including 1 natural vegetation fire where 616 buildings were involved. Only 44 structure or mobile property used as fixed structure fires were reported in NFIRS. The majority of incidents for the Woolsey fire in NFIRS were EMS, Good Intent and Service Calls, including 248 incidents that were canceled en route.
• Camp: Like the Woolsey fire, much of the affected area was outside the local direct protection area, including large WUI areas. One-third of the NFIRS incidents from within the wildfire boundary were fires, with a significant number of EMS and Service Call incidents. Public reports state that 85 lives were lost in the Camp fire, and that nearly 19,000 structures were damaged or destroyed. There are only 8 NFIRS reports for fires in structures or mobile property used as fixed structures associated with the Camp fire, and only 2 of those occurred within the wildfire boundary. No NFIRS reports list any fatalities.

Option 1

Using the Wildland Fire module, a department can report the wildfire as a natural vegetation fire and indicate how many buildings were involved in the fire. It can report property and contents losses as well as deaths and injuries in the Basic Incident module. It can specify location information using the U.S. National Grid. This approach, however, cannot capture vehicle, nonbuilding structure or mobile property used as fixed structure fires, and it does not capture any granular detail about those fires.

Option 2

Using the Fire and Structure Fire modules, a department may report a natural vegetation fire and exposure fires for each structure or vehicle that is damaged by the wildfire. This approach allows local departments to capture detailed information by completing an NFIRS report for each instance of damage. However, this is a considerable amount of data to collect and enter. It also strains the understanding of NFIRS as a system used to record information about incidents to which a fire department responded. If a department was able to respond to the natural vegetation fire but was unable to make any effort to combat exposure fires, it is unclear whether the department “responded” to the exposure fires or not.

Recommendations include:

• Define a new NFIRS form that captures the most salient details for each property affected by a wildfire (e.g., incident type, property use, property and contents loss, location, wildfire perimeter, casualties, and selected data elements from the Fire module) as an appendix to the Wildland Fire module (augmenting the Buildings Involved field).
• Consider using the Special Study field as a way to denote which NFIRS incidents are related to named wildfires and should encourage the use of the U.S. National Grid as a way of identifying location, regardless of whether street address information is available.

This analysis revealed that none of these 6 wildfires were thoroughly reported to the NFIRS. Discrepancies between the loss metrics reported by the media and those in NFIRS are significant. While some of this discrepancy can be explained by the role of NFIRS nonreporters, there are also issues with the comprehensiveness of the NFIRS reports that were submitted. Local fire departments appear to follow different protocols for using NFIRS (e.g., reporting exposure fires, choosing between the Fire and Wildland Fire modules, and completing optional data elements). USFA guidance on the best practices for collecting wildfire-related data (accompanied, if necessary, by changes to the NFIRS itself) could improve how data is captured for future wildfires.