S-190 Principles Of Wildland Fire Behavior Study Guide Graded A+

Box Canyons {Ans: fires starting near the base of box canyons and narrow canyons may react similar to a fire in a wood burning stove or fireplace. air will be drawn in from the canyon bottom creating very strong upslope drafts. these upslope drafts create rapid fire spread up the canyon, also referred to as the chimney effect}Air Mass {Ans: - Extensive body of air, usually 1,000 miles (1,600 km) or more across, having the same properties of temperature and moisture in a horizontal plane - either warm or cold}Timber {Ans: consists largely of trees including two sub groups; - deciduous trees - evergreens}Low Humidity {Ans: increases fire activity, creates a greater fire intensity, higher rate of spread, and more spotfires}Western Trees and Woody Shrubs {Ans: - redwood - douglas fir - eucalyptus - hemlock - live oak - ponderosa pine}Evergreens {Ans: includes cedar, cypress, eucalyptus, fir hemlock, live oak, and different kinds of pine ad spruce}