A general term referring to the spatial distribution and orientation of fuel particles or pieces.

Visual aid containing pertinent information regarding fire organization, current operational period resources, previous operational period resources, and next operational period resources being prepared; placed at a convenient location in fire camp for review by fireline overhead personnel on large fires. 

A natural or improved takeoff and landing area intended for temporary or occasional helicopter use.

Any ground vehicle with personnel capable of maintenance, minor repairs, and limited fueling of dozers.

A stationary in-flight condition for helicopters when no directional flight is achieved.

The lowest value for relative humidity measured at the observation site during the preceding 24-hour period.

The highest value for relative humidity measured at the observation site during the preceding 24-hour period.

Any fireline constructed at a distance from the fire perimeter concurrently with or after a line already constructed on or near to the perimeter of the fire. Generally constructed as an insurance measure in case the fire escapes control by the primary line. 

Multiple fire pattern indicators in relatively close proximity to each other which exhibit a consistent vector.

The net amount of heat that would be given off if fuel burns when it is absolutely dry, noted as Btu per pound of fuel.