Table 2.
Parameter abbreviations and definitions for the independent variables assessed in this analysis
| Parameter | Description |
|---|---|
| RHA | Mean relative humidity (RH) (%) |
| RH (daily minimum)A | Daily minimum RH (%) |
| RH (at 1600 PST)A | Used to approximate the RH at 1630 hours PST criteria for SA3 |
| WSA | Mean 20-ft (6.1 m) wind speed |
| WS (gust)A | Mean gust speed (defined as the maximum 3-s mean over a 2-min period) |
| WS (peak)A | Mean peak wind speed |
| FTA | Mean fuel temperature |
| ATA | Maximum air temperature |
| FMA | Mean 10-h dead fuel moisture |
| SA1 h (#) | Number of hours (0–24) in a day meeting SA1 criteria |
| PD | Mean US CENSUS 2000-derived population density |
| HD | Mean US CENSUS 2000-derived housing unit density |
| LP | The length of the burn perimeter from the previous day |
| SL | Topographic slope, derived from the National Elevation Dataset 1/3 arcsecond (10-m) data |
| FL | Mass per area summed across all fuel strata from the 30-m Fuel Characteristic Classification System map (Ottmar et al. 2007) |
| FFWI | Fosberg Fire Weather Index (Fosberg 1978), based on WS, air temperature and RH |
A
Data derived from the nearest (by straight line) quality-checked Remote Automated Weather Station (National Interagency Fire Center, see http://raws.fam.nwcg.gov). ‘Mean’ values are daily mean of hourly measurements.