Newest Update 2026 | 2027
Ace your S-290 Intermediate Wildland Fire Behavior exam with confidence. This
comprehensive study guide features actual exam-style questions, verified answers, and detailed
rationales for every solution. Perfect for wildland firefighters looking to master critical fire behavior
calculations, weather factors, and safety protocols without wasting time. Download your copy today
and pass on your first try!
Wildland Fire Behavior & Weather Review
1. Topography can directly and indirectly affect fuels and their availability for
combustion.
•
• Answer✅: True
• Rationale: Directly, topography alters the physical slope and orientation of fuels.
Indirectly, it dictates microclimates, solar radiation reception, and wind flow patterns,
which heavily impact fuel moisture and curing rates.
•
1. Of the three primary environmental factors that influence fire behavior, which is
the least variable?
•
• Answer✅: Topography
• Rationale: The three components of the wildland fire environment are weather,
topography, and fuels. While weather changes minute-by-minute and fuels change
1
, seasonally, topography (slope, aspect, elevation) remains physically constant on the
landscape.
•
1. The least critical form of heat transfer that influences rate of spread in a running
wildland fire is:
•
• Answer✅: Conduction
• Rationale: Conduction is heat transfer through direct particle-to-particle contact
(such as through wood). In a running wildland fire, radiation and convection are much
more critical for preheating fuels and driving the rapid forward rate of spread.
•
1. The point to which a combustible material must be heated to produce self-
sustaining combustion is known as the:
•
• Answer✅: Ignition temperature
• Rationale: This is the minimum temperature required to initiate or cause self-
sustained combustion in any substance without the continuous introduction of an
external heat source.
•
1. Fireline intensity is dependent upon:
•
• Answer✅: All of the above (Fuel size, Fuel moisture, Fuel temperature, Fuel
compactness and arrangement)
• Rationale: Fireline intensity measures the heat release per unit length of fireline. It is
fundamentally governed by how much fuel is available, its temperature, how dry it is,
and how easily oxygen can circulate through the fuel matrix to sustain combustion.
•
1. Two requirements for long range spotting are wind and a well developed
convection column.
•
• Answer✅: True
2
, • Rationale: A powerful, well-developed convection column is required to lift burning
embers (firebrands) high into the atmosphere, while strong winds aloft are needed to
transport those embers far ahead of the main fire front.
•
1. A fire that advances through canopies of brush and trees is known as a:
•
• Answer✅: Crown fire
• Rationale: Crown fires travel through the upper canopy or crowns of trees and brush,
often moving independently of, or significantly faster than, surface fires.
•
1. Fire is burning in litter on top of the ground, but occasionally carries into the
crowns of individual trees, which produces burning embers that start new fires
outside the fire perimeter.
•
• Answer✅: Surface fire with torching and spotting.
• Rationale: Burning in ground litter defines a surface fire. The transition of individual
trees or small groups of trees burning from the bottom up is called "torching," while
ember-driven fires outside the main lines are "spotting."
•
1. Fire begins burning into the crowns and spreads through the canopy. There is a
sudden increase in fireline intensity where the fire controls its environment. At
one point flames can be seen carried high into the convection column with a
whirling motion.
•
• Answer✅: Crown fire with extreme fire behavior. (Note: Adjusted from the
source prompt text to reflect correct firefighting terminology for a whirling canopy
fire controlling its environment).
• Rationale: When a fire leaves the ground entirely, establishes continuous canopy
spread, dictates its own local wind systems, and produces fire whirls, it is classified as
a crown fire displaying extreme fire behavior.
•
1. Upward moving air contracts and warms.
•
3
Ace your S-290 Intermediate Wildland Fire Behavior exam with confidence. This
comprehensive study guide features actual exam-style questions, verified answers, and detailed
rationales for every solution. Perfect for wildland firefighters looking to master critical fire behavior
calculations, weather factors, and safety protocols without wasting time. Download your copy today
and pass on your first try!
Wildland Fire Behavior & Weather Review
1. Topography can directly and indirectly affect fuels and their availability for
combustion.
•
• Answer✅: True
• Rationale: Directly, topography alters the physical slope and orientation of fuels.
Indirectly, it dictates microclimates, solar radiation reception, and wind flow patterns,
which heavily impact fuel moisture and curing rates.
•
1. Of the three primary environmental factors that influence fire behavior, which is
the least variable?
•
• Answer✅: Topography
• Rationale: The three components of the wildland fire environment are weather,
topography, and fuels. While weather changes minute-by-minute and fuels change
1
, seasonally, topography (slope, aspect, elevation) remains physically constant on the
landscape.
•
1. The least critical form of heat transfer that influences rate of spread in a running
wildland fire is:
•
• Answer✅: Conduction
• Rationale: Conduction is heat transfer through direct particle-to-particle contact
(such as through wood). In a running wildland fire, radiation and convection are much
more critical for preheating fuels and driving the rapid forward rate of spread.
•
1. The point to which a combustible material must be heated to produce self-
sustaining combustion is known as the:
•
• Answer✅: Ignition temperature
• Rationale: This is the minimum temperature required to initiate or cause self-
sustained combustion in any substance without the continuous introduction of an
external heat source.
•
1. Fireline intensity is dependent upon:
•
• Answer✅: All of the above (Fuel size, Fuel moisture, Fuel temperature, Fuel
compactness and arrangement)
• Rationale: Fireline intensity measures the heat release per unit length of fireline. It is
fundamentally governed by how much fuel is available, its temperature, how dry it is,
and how easily oxygen can circulate through the fuel matrix to sustain combustion.
•
1. Two requirements for long range spotting are wind and a well developed
convection column.
•
• Answer✅: True
2
, • Rationale: A powerful, well-developed convection column is required to lift burning
embers (firebrands) high into the atmosphere, while strong winds aloft are needed to
transport those embers far ahead of the main fire front.
•
1. A fire that advances through canopies of brush and trees is known as a:
•
• Answer✅: Crown fire
• Rationale: Crown fires travel through the upper canopy or crowns of trees and brush,
often moving independently of, or significantly faster than, surface fires.
•
1. Fire is burning in litter on top of the ground, but occasionally carries into the
crowns of individual trees, which produces burning embers that start new fires
outside the fire perimeter.
•
• Answer✅: Surface fire with torching and spotting.
• Rationale: Burning in ground litter defines a surface fire. The transition of individual
trees or small groups of trees burning from the bottom up is called "torching," while
ember-driven fires outside the main lines are "spotting."
•
1. Fire begins burning into the crowns and spreads through the canopy. There is a
sudden increase in fireline intensity where the fire controls its environment. At
one point flames can be seen carried high into the convection column with a
whirling motion.
•
• Answer✅: Crown fire with extreme fire behavior. (Note: Adjusted from the
source prompt text to reflect correct firefighting terminology for a whirling canopy
fire controlling its environment).
• Rationale: When a fire leaves the ground entirely, establishes continuous canopy
spread, dictates its own local wind systems, and produces fire whirls, it is classified as
a crown fire displaying extreme fire behavior.
•
1. Upward moving air contracts and warms.
•
3
