Wildland firefighting 2025
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
The weather factors that can affect the start and spread of wildland fires are: (4) - 1)
Wind
2) Relative humidity
3) Temperature
4) Precipitation
The atmosphere consists of several layers. The layer of atmosphere closest to the ground is
called the _______ - troposphere
From a wildland fire fighting perspective, the two most important components of the
atmosphere are _________ and __________ - oxygen, water vapor
What is in the air
21% ___________
1% other gases
78% _______ - Oxygen, nitrogen
Atmospheric Pressure
One square inch of air (from sea level to the top of the atmosphere) weighs about ____ pounds
(the equivalent of 29.92 inches of mercury) - 14.7
_______ has the greatest impact on fire behavior of any of the weather factors. - Wind
The passage of warm fronts will usually bring a wind direction shift of ____ to ____ degrees. The
passage of a cold front will shift wind direction from less than ____ degrees to as much as ____
degrees - 45,90 45,180
, An approaching cold front is an indicator of _____. Winds shift and increase in speed as the cold
front approaches. - winds
Wind Indicators:
■ Strong surface winds
■ High, fast moving clouds
■ Approaching cold front
■ Cumulonimbus
■ Battling (or opposing) winds or sudden calm -
Cumulonimbus development is an indicator of winds. Thunderstorms present the potential for
strong, erratic ______ winds. Lightning is associated with these storms. Also, virga may be
observed (Virga is rain that does not reach the, ground.) This is a good indicator that downdrafts
have begun. - downdraft
There are several winds that you should be familiar with. They are:
_________ winds which affect large areas. These are the winds that are reported in daily
weather forecasts.
_______ winds which are produced by features of the local terrain
________ winds which are normally measured at 20 feet above the ground
________ winds which occur at the midpoint of flame height, and have the greatest effect on
the direct on a fire will bum - General, Local, Surface, Mid-flame
Winds are identified by the direction the wind is ________, not for where it is going. -
coming from
Wind affects wildland fire spread in several important ways:
■ By increasing the supply of ______, thus aiding combustion.
■ By driving ________ into adjacent fuels, hastening the drying process
■ By influencing the _______ of spread and spotting
■ By ______ the flames closer to unburned fuels, preheating, drying and igniting them
■ By ________, replacing it with drier air
■ By _______ to new fuels and increasing fire spread
|MOST COMMON QUESTIONS WITH CORRECTLY
VERIFIED ANSWERS|ALREADY A+
GRADED|GUARANTEED PASS
The weather factors that can affect the start and spread of wildland fires are: (4) - 1)
Wind
2) Relative humidity
3) Temperature
4) Precipitation
The atmosphere consists of several layers. The layer of atmosphere closest to the ground is
called the _______ - troposphere
From a wildland fire fighting perspective, the two most important components of the
atmosphere are _________ and __________ - oxygen, water vapor
What is in the air
21% ___________
1% other gases
78% _______ - Oxygen, nitrogen
Atmospheric Pressure
One square inch of air (from sea level to the top of the atmosphere) weighs about ____ pounds
(the equivalent of 29.92 inches of mercury) - 14.7
_______ has the greatest impact on fire behavior of any of the weather factors. - Wind
The passage of warm fronts will usually bring a wind direction shift of ____ to ____ degrees. The
passage of a cold front will shift wind direction from less than ____ degrees to as much as ____
degrees - 45,90 45,180
, An approaching cold front is an indicator of _____. Winds shift and increase in speed as the cold
front approaches. - winds
Wind Indicators:
■ Strong surface winds
■ High, fast moving clouds
■ Approaching cold front
■ Cumulonimbus
■ Battling (or opposing) winds or sudden calm -
Cumulonimbus development is an indicator of winds. Thunderstorms present the potential for
strong, erratic ______ winds. Lightning is associated with these storms. Also, virga may be
observed (Virga is rain that does not reach the, ground.) This is a good indicator that downdrafts
have begun. - downdraft
There are several winds that you should be familiar with. They are:
_________ winds which affect large areas. These are the winds that are reported in daily
weather forecasts.
_______ winds which are produced by features of the local terrain
________ winds which are normally measured at 20 feet above the ground
________ winds which occur at the midpoint of flame height, and have the greatest effect on
the direct on a fire will bum - General, Local, Surface, Mid-flame
Winds are identified by the direction the wind is ________, not for where it is going. -
coming from
Wind affects wildland fire spread in several important ways:
■ By increasing the supply of ______, thus aiding combustion.
■ By driving ________ into adjacent fuels, hastening the drying process
■ By influencing the _______ of spread and spotting
■ By ______ the flames closer to unburned fuels, preheating, drying and igniting them
■ By ________, replacing it with drier air
■ By _______ to new fuels and increasing fire spread
