Terminology
Area of unburned fuel inside the fire perimeter
Island
The three components of the fire triangle are?
Fuel
Air
Heat
The degree of hotness or coldness of a substance
Temperature
This fire behavior can indicate the potential for extreme fire weather to develop.
Problem fire behavior
As the temperature increases above this threshold, fuels that are being heated closer to their point of ignition becomes a greater concern.
>85oF
A sudden acceleration in the rate of spread or intensification of relative short duration. Does not change existing control plans
Flare up
The three methods of heat transfer are?
Radiation
Convection
Conduction
When warm air is over cold air, this stable atmosphere is created.
Inversion
(Temperature increases with altitude)
These strong, dry winds can last for days and create an high rates of fire spread due to the combination of high wind speeds and low relative humidity.
Foehn Winds
This slope aspect typically has heavier fuels, lower temperatures, higher humidity and fuel moistures.
North Facing slopes
A unit of measure in land survey, equal to 66 feet.
Chain
What is the relationship between temperature and relative humidity?
Inverse
As temperature increases, relative humidity decreases
As temperature decreases, relative humidity increases
List an example of an unstable atmosphere.
Clouds grow vertically and smoke rises to great hights
Cumulus clouds
Good visibility
Gusty winds
Dust devils and fire whirls
This type of vertically arranged fuel can carry ground fires into the upper canopy, leading to torching and crown fires.
Ladder fuels
A sudden calm in the wind can be an indicator for this factor in fire spread.
Wind change
Behavior of a fire spreading rapidly with a well defined head.
Running fire
What type of fuel has the greatest surface area to volume ratio?
Grass
Because of this grass burns the fastest and hottest
This region of warmer air is typically found on the middle third of the slope and wildfires can remain active through the night in this zone.
Thermal Belts
Firewhirls
This topographical feature provides potential for rapid rates of fire spread by combining steep terrain with updrafts of air.
Chutes/Chimneys
The status of a wildfire suppression action signifying that a control line has been completed around the fire, and any associated spot fires, which can reasonably be expected to stop the fire's spread.
Controlled
The amount of water in a fuel, expressed as a percentage of the oven-dry weight of that fuel
Fuel moisture
This local wind typically causes upslope winds during the mid-afternoon, and the greatest downslope winds after midnight.
Slope Winds
When this heavy dense air meets a mass of lighter air, strong frontal winds, shifts in wind direction and a unstable atmosphere are created.
Cold Fronts
Relative humidity levels below this general threshold is an indicator that more fine fuels are able to carry fire, though this number may be different in the Eastern United States, Hawaii and Alaska
25%