Structures Lost per 1,000 Acres burned, based on 209 data and State and Fed incidents

Mean annual number of incidents from unknown and accidental causes, normalized by area

Annual average of reported NFIRS incidents (per 100 sq mi).

Area burned by fires started by natural causes, normalized by county area.

Bailey's ecoregion (modal value).

Community cluster based on eight clusters.

Demographic factor score of socioeconomic factors such as poverty rates, household income, population growth and educational attainment.

Dominant economic activity from the USDA Economic Research Service's ERS County typology codes.

Families below the poverty line - Percentage of families in the county that are below the poverty threshold. The income threshold for poverty varies by family size, number of children and age of the householder.

Federal 99th percentile fire size.

Federal Fires of Concern are fires that burned an area greater than 640 acres or that burned for a duration of at least 2 weeks.

Federal median fire size.

Number of fire stations per 100 sq. miles.

Forest industry jobs (% of total county employment)

Sum of area available for mechanical treatment in forest.

Index of forest product production.

Hotspot density in natural areas.

Housing density within interface 2000.

Counties where 30 percent or more of households had one or more of these housing conditions in 2000: lacked complete plumbing, lacked complete kitchen, paid 30 percent or more of income for owner costs or rent, or had more than 1 person per room in 2000.

Mean annual area burned from incendiary causes, normalized by area.

Index of structures lost per are burned, calculated for each combo class

Landscape resiliency class.

Counties where less than 65 percent of residents 21-64 years old were employed in 2000.

Maximum annual acres burned (2002-2011) and normalized by area.

Maximum number of fires reported in a single year (2002-2011), all sources combined

Mean FIL estimated using FSIM.

American Community Survey, 2005-2009, median income of families (USD). A family includes a householder and one or more individuals related to the householder by birth, marriage or adoption.

Landcover classification type with the most MODIS hotspots per county.

Percent area in natural vegetation landcover.

The 95th percentile arrival time for incidents reported in NFIRS.

NFIRS 99th percentile fire size (reported in acres).

NFIRS Number of buildings involved.

NFIRS fires of concern due to size (100 ac or larger).

NFIRS median arrival time.

NFIRS median fire size (reported in acres).

Sum of acres treated by the federal agencies and bureaus

Percent area available for prescribed fire in non-forested landscapes.

Percent of county area within interface 2000.

Percentage of hotspots within a wildfire perimeter.

Percentage of hotspots in PADUS lands.

Annualized population growth from 1990-2010

Sum of area available for prescribed fire, forest and non-forest.

Number of first responders per 100 square miles.

Index based on the sum of Persistent Poverty, Housing Stress, Low Employment, Low Educational Attainment, and Population Loss.

State 99th percentile fire size (reported in acres).

State Annual average of area burned per hundred square miles.

WUI factor score (weighted toward urban or % agriculture)

Physical environment factor score weighted to terrain and summer precipitation.

Total count of hotspots.

Urban economic influence from USDA ERS County typology codes

Physical environment factor score weighted to seasonal temperature.

Acres in wilderness or inventoried roadless areas.

Ratio of area burned by wildfire and prescribed fire. Areas with lower values have a greater proportion of area burned by prescribed fire than wildfire and areas with higher values have a greater proportion of area burned by wildfire than by prescribed fire.

wildfire-rx fire ratio = log10(area burned in wildfire) - log10(area treated with Rx fire)

Percent Growth in WUI area from 1990-2000

Percentage of all housing units in the County that are within the WUI, based on SILVIS 2000 WUI Statistics.