The speed of the wind measured at the midpoint of the flames, considered to be most representative of the speed of the wind that is affecting fire behavior.

Progressive method of fireline construction on a wildfire without changing relative positions in the line. Work is begun with a suitable space between workers; whenever one worker overtakes another, all of those ahead move one space forward and resume work on the uncompleted part of the line. The last worker does not move ahead until work is completed in his/her space. Forward progress of the crew is coordinated by a crew boss. 

Individual responsible to the Deck Coordinator for the manifesting, loading and unloading of personnel, equipment and cargo.

A heavy duty plowshare or disc plow usually pulled by a tractor to construct a fireline.

Tanks, doors, and release mechanism installed in aircraft for cascading fire retardants.

A circle graduated in 360 degrees in a clockwise direction from true (astronomic) north.

An airtanker is "on final" when it is on line with the target and intends to make the drop on that pass; also applies to cargo dropping.

An agency form used to calculate helicopter allowable payload.

Geographic subdivision of a fire-protected area, delimiting the initial attack bounds of a single fire guard or fire crew.

Effect of wind on smoke, retardant drops, paracargo, smokejumper streamers, etc.