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  • Wildfire Risk Factor: Landscape Vegetation - CalFire Insure
    Uphill Acceleration: Fires naturally spread much faster uphill than on flat ground or downhill This is due to the phenomenon of preheating As flames move uphill, they are closer to the unburned fuels above them, rapidly drying and heating these fuels, making them more receptive to ignition
  • Does Fire Burn Faster Uphill or Downhill? - Biology Insights
    The slope, or topography, of the land is a static and predictable factor influencing a wildfire’s rate of spread Firefighters use a rule of thumb: for every increase of 10 degrees in uphill slope, the rate of fire spread approximately doubles
  • How Fire Becomes Uncontrollable: Fuel, Wind, and Terrain
    The National Wildfire Coordinating Group uses a rough rule: tripling the slope doubles the rate of fire spread Triple the slope again, and the fire moves four to six times faster, depending on fuel conditions
  • Fire behavior - OSU Extension Service
    When fire moves uphill, it preheats the vegetation above and tends to spread much faster and be more intense Conversely, when fire is moving downhill or backing into the wind, the spread is slower and less intense because there is less preheating of the fuel
  • Is It Easier for Fire to Burn Uphill or Downhill? - CompleteEra
    **Fire burns more intensely uphill** because gravity, oxygen flow, and heat rise naturally, creating a self-sustaining cycle However, **downhill fires can spread faster horizontally** due to wind and terrain, making them more dangerous in certain conditions
  • Bushfire behaviour - CFS - SA Country Fire Service
    Once a fire is burning, its behaviour is determined by three main factors: fuel, weather and topography Bushfires are fuelled by vegetation How hot the fire becomes or how fast it spreads depends on the amount, type, condition, and the arrangement of the vegetation or fuels
  • Wildfire Behavior: How Slope, Wind, and Fuel Create Uncontrollable Fire
    Fire on a flat surface spreads outward from the ignition point in all directions at roughly equal rates, governed primarily by wind Fire on a slope has an asymmetry: it spreads uphill significantly faster than it spreads downhill or laterally The reason is direct and physical — preheating
  • How Does Wildfire Spread? - The Institute for Environmental Research . . .
    Wildfires spread through a complex interplay of fuel, weather, and topography, essentially fueled by a chain reaction of heat transfer that ignites more and more vegetation
  • How Fire Behaves | CFA (Country Fire Authority)
    Radiant heat pre-heats the fuel in front of the fire, making the fuel even more flammable For every 10˚ slope, the fire will double its speed For example, if a fire is travelling at 5 km per hour along flat ground and it hits a 10˚ slope it will double in speed to 10 km per hour up the hill
  • What Is Bushfire Behaviour — and Why Does It Matter for Planning?
    Fires behave very differently depending on whether they’re burning uphill, downhill, or across level ground Slope affects both the speed and severity of a fire





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