As the fire spreads to more available fuels the complexity of the of the situation increases; temperatures rise, convection columns develop, more torching occurs and the fire begins to burn in the heavier ‘one hundred and one thousand hour fuels’. A simple brush fire is developing into a more complex forest fire. I took this image mid afternoon on a clear, summer’s day but the smoke column from the larger body of the main fire was so thick it appears to be late twilight. What you see here are spot fires in the advance of the main blaze.