Burning: 0
Burned area: 0%
Fire line speed: 0 m/s
Spotting: 0
Wildfire spread is a percolation process: fire propagates only when fuel density exceeds a critical threshold p_c ≈ 0.59 (site percolation on a square lattice). Wind creates anisotropic spread via the Rothermel model (1972): wind multiplier increases forward ROS exponentially, elongating the fire ellipse. Spotting — firebrands lofted by pyroconvection columns — can jump firebreaks and start new ignitions up to 35 km ahead of the main front. Click to ignite fires; adjust wind and moisture to see percolation dynamics.