Instructional aid in which the sides of a triangle are used to represent the three factors (oxygen, heat, fuel) necessary for combustion and flame production; removal of any of the three factors causes flame production to cease.

Direction at peak wind speed.

The time when all observable combustion has ceased or there is no risk of the fire again becoming active and requiring additional control or management actions. All management activities directly relating to suppression (including mop-up), monitoring, or burning efforts have concluded; however, there may be secondary management efforts, such as burned area rehabilitation or hazard mitigation, still in process.

A general term referring to the historic fire occurrence of a given geographic area.

Allowable aircraft cabin load, in pounds, with full fuel and pilot in calm air at standard atmosphere.

A meteorological station specially equipped to measure weather elements that have an important effect on fire behavior.

Evaluation of a dwelling and its immediate surrounding to determine its potential to escape damage by an approaching wildland fire. Includes the fuels and vegetation in the yard and adjacent to the structure, roof environment, decking and siding materials, prevailing winds, topography, fire history, etc., with the intent of mitigating fire hazards and risks. 

The horizontal direction to or from any point, usually measured clockwise from true north, or some other reference point through 360 degrees.

Lowest temperature at which the vapor of a combustible liquid can be made to ignite in air.

Areas in the fire where fuel accumulations, heavy fuels, or higher fuel moisture content cause the fire to burn for an extended period of time.