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aerial fuels average backfire brush burning conditions canyon cheatgrass clouds combustion Continental Divide cooling crown fires Cumulonimbus cloud curing dead wood dense duff dust devils estimate feet Figure fire area fire behavior situation fire control fire danger fire line fire season fire triangle fire weather stations firefighter fires occur flames forest fire forest fuels fuel moisture fuel type grass ground fuels heavy fuels hot fire ignition inflammable material influence July and August Lenticular clouds lightning fires limbs lower main fire Medium moisture content moss mountain tops national forests normally northern Rocky Mountains oxygen ponderosa pine precipitation Priest River Experimental radiant heat transfer rate of spread rate-of-spread classification rate-of-spread fuels relative humidity River Experimental Forest safety measures smokejumpers snags south slope spread of fires steep slopes Table Table Table thermal belt topographic tree crowns upslope valley bottoms vegetation weather factors weather forecast western zone wind direction wind velocity