Sensor Readings & Environmental Telemetry
Temperature, Humidity & Wind in Wildfire Spread
The atmospheric triad driving ignition, spread velocity, and extreme convective fire behavior.
Weather is the single most volatile component of the wildfire triangle (Fuel, Topography, Weather). Minute-by-minute fluctuations in temperature, relative humidity (RH), and wind vector determine whether a fire remains a manageable surface smolder or transitions into an explosive crown fire run.
Relative Humidity (RH) Thresholds
When relative humidity drops below 30%, fine fuels (grass, needles, cured moss) lose equilibrium moisture rapidly. Below 15% RH, fuels become volatile: spot fires ignite effortlessly from airborne embers, and suppression tactics face extreme difficulty.
Wind Vectors & Convective Flame Tilt
Wind tilts flames forward toward unburned fuel, transferring radiant and convective heat exponentially. Forward Rate of Spread (ROS) scales as a power function of sustained 10-meter wind speed, while gusting winds launch burning embers kilometers ahead (spotting).
Temperature & Fuel Preheating
High ambient summer temperatures preheat forest fuels closer to their thermal ignition threshold (~300°C), reducing the calories required from the advancing flame front to sustain chain reaction combustion.
C-Haines & Atmospheric Instability
The Continuous Haines (C-Haines) index evaluates mid-tropospheric lapse rates and dryness. High C-Haines values (>9) indicate super-unstable air where intense wildfire convection columns can punch through the inversion layer and spawn pyrocumulonimbus (pyroCb) lightning storms.