S-290 Intermediate Wildland Fire
Behavior
T/F
Topography can directly and indirectly affect fuels and their availability for combustion -
answerTrue
Of the three environmental factors that influence fire behavior, which is the least
variable - answertopography
What are the 3 Environmental Factors that influence Fire Behavior? - answer1) Weather
2) Topography
3) Fuels
The least critical form of heat transfer that influences rate of spread in a running
wildland fire is. - answerConduction
The point to which a combustible material must be heated to produce self sustaining
combustion is known as the - answerIgnition temperature
What factors primarily affect fireline intensity? - answerFuel size
Fuel moisture
Fuel temperature
Fuel compactness and arrangement
ALL OF THE ABOVE
T/F
Two requirements for long range spotting are wind and a well developed convection
column. - answerTrue
A fire that advances through canopies of brush and trees is known as a - answerCrown
fire
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 - answerSurface fire with torching and spotting
T/F
Upward moving air contracts and warms - answerFalse
, As air sinks it - answerIncreases in pressure, warms and compresses
Foehn winds can adversely affect wildland fires because they can produce -
answerStrong winds, warmer temperatures, and very low relative humidity
When stable air is forced over a mountain range, and then descends the leeward slope
as dry, warmed air, it is called - answerA foehn Wind (look this up)
T/F
Bends in canyons are likely places for eddies to form - answerTrue
Local winds are best described as - answerSmall scale convective winds of local origin
caused by differences in heating and cooling
East, Mono, Santa Ana, and Chinook are all examples of
________________________. - answerFoehn Winds
T/F
Air flows clockwise around low pressure systems and counterclockwise around high
pressure systems - answerFalse.
Counterclockwise in Low Pressures
Clockwise in High Pressures
T/F
Unstable air can often be found in low pressure systems and on leading edge of cold
fronts - answerTrue
T/F
Unstable air can be formed by either heating the air near the ground or by cooling the
air aloft - answerTrue
How is wind direction described? - answerWind direction is named by the direction wind
is blowing *FROM*
A slope wind is caused by - answerWarm air rising and cold air settling
Stable/Unstable;
Gusty winds - answerUnstable
Stable/Unstable;
Behavior
T/F
Topography can directly and indirectly affect fuels and their availability for combustion -
answerTrue
Of the three environmental factors that influence fire behavior, which is the least
variable - answertopography
What are the 3 Environmental Factors that influence Fire Behavior? - answer1) Weather
2) Topography
3) Fuels
The least critical form of heat transfer that influences rate of spread in a running
wildland fire is. - answerConduction
The point to which a combustible material must be heated to produce self sustaining
combustion is known as the - answerIgnition temperature
What factors primarily affect fireline intensity? - answerFuel size
Fuel moisture
Fuel temperature
Fuel compactness and arrangement
ALL OF THE ABOVE
T/F
Two requirements for long range spotting are wind and a well developed convection
column. - answerTrue
A fire that advances through canopies of brush and trees is known as a - answerCrown
fire
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 - answerSurface fire with torching and spotting
T/F
Upward moving air contracts and warms - answerFalse
, As air sinks it - answerIncreases in pressure, warms and compresses
Foehn winds can adversely affect wildland fires because they can produce -
answerStrong winds, warmer temperatures, and very low relative humidity
When stable air is forced over a mountain range, and then descends the leeward slope
as dry, warmed air, it is called - answerA foehn Wind (look this up)
T/F
Bends in canyons are likely places for eddies to form - answerTrue
Local winds are best described as - answerSmall scale convective winds of local origin
caused by differences in heating and cooling
East, Mono, Santa Ana, and Chinook are all examples of
________________________. - answerFoehn Winds
T/F
Air flows clockwise around low pressure systems and counterclockwise around high
pressure systems - answerFalse.
Counterclockwise in Low Pressures
Clockwise in High Pressures
T/F
Unstable air can often be found in low pressure systems and on leading edge of cold
fronts - answerTrue
T/F
Unstable air can be formed by either heating the air near the ground or by cooling the
air aloft - answerTrue
How is wind direction described? - answerWind direction is named by the direction wind
is blowing *FROM*
A slope wind is caused by - answerWarm air rising and cold air settling
Stable/Unstable;
Gusty winds - answerUnstable
Stable/Unstable;
