1. Topographic Effects on Fire Behavior

2. Objectives §Describe how slope affects fire spread. §List five factors of topography that affect fire behavior. §Describe the dangerous conditions that can develop in a box canyon and steep narrow canyons (valleys).

3. Factors of Topography That Affect Spread of Fire Aspect--Direction a slope faces. Slope-- Steepness Position of Fire-- Top, middle, or bottom of slope. Shape of Country-- Narrow canyons/valleys and boxed canyons/valleys. Elevation-- Relates to curing of fuels, precipitation, length of fire, season, etc.

4. ASPECT NORTH HEAVY FUELS SHADE MOIST SOUTH LIGHT FUELS SUNNY DRY

5. STEEP SLOPES CAUSE RAPID FIRE SPREAD

6. POSITION OF FIRE ON SLOPE SLOPE FIRE NEAR TOP OF SLOPE FSDefaultUser:

7. The Shape of the Country §Box Canyons §Narrow Canyons §Ridges §Saddles

8. BOX CANYON & CHIMNEY EFFECT

9. RADIANT HEAT ACROSS NARROW CANYON/VALLEY

11. SPOTTING ACROSS NARROW CANYON/VALLEY

12. LATERAL RIDGE TO CANYON/VALLEY

13. MOUNTAINS CAUSE CHANNELING OF WIND

14. ELEVATION SEA LEVEL GRASS SHRUBS TREES