S-290 COMPREHENSIVE STUDY GUIDE
2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ How does live and dead fuel moisture content affect fire behavior?.
Answer: Live fuels are consumed by fire when there are enough dead, dry
fuels present to support the fire.
◍ What is a barrier in the context of wildland fires?.
Answer: Any obstruction to the spread of fire, typically an area devoid of
combustible fuel.
◍ What does the fire behavior triangle include?.
Answer: The fire behavior triangle includes fuels, weather, and topography.
◍ What are the three main factors affecting Earth's surface temperature?.
Answer: Solar angle and duration, atmospheric moisture and air pollutants,
surface properties of terrain and vegetation.
◍ How does the atmosphere behave like a greenhouse?.
Answer: The atmosphere allows visible solar radiation to enter but inhibits
the passage of outgoing infrared radiation.
◍ What are the seven characteristics that affect fire behavior?.
Answer: Compactness, loading, horizontal continuity, vertical arrangement,
chemical content, size and shape, and moisture content.
◍ What are the causes of a decrease in fires over the last several centuries?.
Answer: Increased grazing removing the fine fuels that allow fire to spread
across the landscapeLogging taking large fire-resistant treesFire
suppressionRoads and railroads blocking the spread of fire
◍ What are some of the advantages of using digital weather meters?.
, Answer: Tracks trendsReduced user error. Correct Easy to read in low light.
CorrectSmall and lightweight CorrectRequires batteries
◍ What is the effect of cloud cover on heat loss at night?.
Answer: Cloud cover reduces the loss of longwave radiation, keeping
nighttime temperatures warmer.
◍ What is the relevance of pre-course work in the S-290 course?.
Answer: Pre-course work prepares students for the content and expectations
of the course.
◍ What conditions do north-facing slopes typically have?.
Answer: More shade, heavier fuels, lower temperatures, and higher
humidity.
◍ How is climate change affecting wildland fire?.
Answer: The length of the fire season is increasingWeather is hotter and
drier in many places
◍ What is the process by which heat from the Earth is returned to the
atmosphere?.
Answer: Heat is returned to the atmosphere as longwave or terrestrial
radiation through conduction and convection.
◍ Why are surface fuels important in fire behavior?.
Answer: They are crucial for line construction and mop-up, and they often
carry wildfires.
◍ What happens if incoming solar radiation exceeds outgoing radiation?.
Answer: The Earth and its atmosphere would warm.
◍ Which aspects are most favorable for fire start and spread?.
Answer: South and southwest aspects
◍ What factors contribute to variations in temperature and humidity on
slopes?.
Answer: The position on the slope and the slope's aspect.
◍ What happens to air pressure approximately every 1000 feet of elevation
, gain?.
Answer: Air pressure decreases approximately one inch of mercury for
every 1000 feet increase in elevation.
◍ What happens to the remaining solar energy that does not reach the Earth's
surface?.
Answer: 30% is reflected back to space, and 19% is absorbed by clouds,
dust, and pollutants.
◍ Which topographic factor has the most direct effect on fire behavior?.
Answer: Steepness of slope.
◍ What is the importance of understanding fuel characteristics in wildland fire
behavior?.
Answer: Fuel characteristics determine how easily a fire ignites, spreads,
and its overall intensity.
◍ How does a closed timber canopy affect fire behavior?.
Answer: It shades surface fuels, prolongs moisture retention, and reduces
wind speeds, affecting surface fires.
◍ What is the primary carrier of fire in the timber litter group?.
Answer: Surface litter.
◍ What is the significance of modeling fire behavior?.
Answer: It helps predict fire spread and intensity, aiding in fire management
and safety.
◍ What is the fuel bed depth range for timber litter?.
Answer: Between 0.2 to 1 foot.
◍ What is the significance of the Fireline Assessment Method (FLAME)?.
Answer: It provides a practical tool for predicting significant changes in
wildland fire behavior, such as rate of spread (ROS).
◍ What is considered an aggressive rate of spread?.
Answer: Fire that is moving at a pace the crews or equipment cannot keep
up with using direct attack.
2026 FULL QUESTIONS AND
SOLUTIONS GRADED A+
◍ How does live and dead fuel moisture content affect fire behavior?.
Answer: Live fuels are consumed by fire when there are enough dead, dry
fuels present to support the fire.
◍ What is a barrier in the context of wildland fires?.
Answer: Any obstruction to the spread of fire, typically an area devoid of
combustible fuel.
◍ What does the fire behavior triangle include?.
Answer: The fire behavior triangle includes fuels, weather, and topography.
◍ What are the three main factors affecting Earth's surface temperature?.
Answer: Solar angle and duration, atmospheric moisture and air pollutants,
surface properties of terrain and vegetation.
◍ How does the atmosphere behave like a greenhouse?.
Answer: The atmosphere allows visible solar radiation to enter but inhibits
the passage of outgoing infrared radiation.
◍ What are the seven characteristics that affect fire behavior?.
Answer: Compactness, loading, horizontal continuity, vertical arrangement,
chemical content, size and shape, and moisture content.
◍ What are the causes of a decrease in fires over the last several centuries?.
Answer: Increased grazing removing the fine fuels that allow fire to spread
across the landscapeLogging taking large fire-resistant treesFire
suppressionRoads and railroads blocking the spread of fire
◍ What are some of the advantages of using digital weather meters?.
, Answer: Tracks trendsReduced user error. Correct Easy to read in low light.
CorrectSmall and lightweight CorrectRequires batteries
◍ What is the effect of cloud cover on heat loss at night?.
Answer: Cloud cover reduces the loss of longwave radiation, keeping
nighttime temperatures warmer.
◍ What is the relevance of pre-course work in the S-290 course?.
Answer: Pre-course work prepares students for the content and expectations
of the course.
◍ What conditions do north-facing slopes typically have?.
Answer: More shade, heavier fuels, lower temperatures, and higher
humidity.
◍ How is climate change affecting wildland fire?.
Answer: The length of the fire season is increasingWeather is hotter and
drier in many places
◍ What is the process by which heat from the Earth is returned to the
atmosphere?.
Answer: Heat is returned to the atmosphere as longwave or terrestrial
radiation through conduction and convection.
◍ Why are surface fuels important in fire behavior?.
Answer: They are crucial for line construction and mop-up, and they often
carry wildfires.
◍ What happens if incoming solar radiation exceeds outgoing radiation?.
Answer: The Earth and its atmosphere would warm.
◍ Which aspects are most favorable for fire start and spread?.
Answer: South and southwest aspects
◍ What factors contribute to variations in temperature and humidity on
slopes?.
Answer: The position on the slope and the slope's aspect.
◍ What happens to air pressure approximately every 1000 feet of elevation
, gain?.
Answer: Air pressure decreases approximately one inch of mercury for
every 1000 feet increase in elevation.
◍ What happens to the remaining solar energy that does not reach the Earth's
surface?.
Answer: 30% is reflected back to space, and 19% is absorbed by clouds,
dust, and pollutants.
◍ Which topographic factor has the most direct effect on fire behavior?.
Answer: Steepness of slope.
◍ What is the importance of understanding fuel characteristics in wildland fire
behavior?.
Answer: Fuel characteristics determine how easily a fire ignites, spreads,
and its overall intensity.
◍ How does a closed timber canopy affect fire behavior?.
Answer: It shades surface fuels, prolongs moisture retention, and reduces
wind speeds, affecting surface fires.
◍ What is the primary carrier of fire in the timber litter group?.
Answer: Surface litter.
◍ What is the significance of modeling fire behavior?.
Answer: It helps predict fire spread and intensity, aiding in fire management
and safety.
◍ What is the fuel bed depth range for timber litter?.
Answer: Between 0.2 to 1 foot.
◍ What is the significance of the Fireline Assessment Method (FLAME)?.
Answer: It provides a practical tool for predicting significant changes in
wildland fire behavior, such as rate of spread (ROS).
◍ What is considered an aggressive rate of spread?.
Answer: Fire that is moving at a pace the crews or equipment cannot keep
up with using direct attack.
