A colored flare designed as a railway warning device, widely used to ignite backfires and other prescribed fires.

Track of an aircraft over the earth's surface.

Atmospheric conditions under which pollutants build up faster than the atmosphere can disperse them.

An injury or illness/disease caused by a person or object under circumstances that indicate there may be a legal liability on a party other than the federal or state government.

The compass direction in which the longitudinal axis of the aircraft points.

An elongated area of relatively high pressure, at a constant altitude, in the atmosphere. The opposite of an upper level trough. Upper level ridges are often oriented north-south, alternating between upper level troughs, however, during summer they may assume random orientations and vast dimensions. 

A written plan providing for timely recognition of approaching critical fire situations, priority setting, the deployment of forces, and other actions to respond to those situations.

A fully qualified individual who, in the absence of a superior, can be delegated the authority to manage a functional operation or to perform a specific task. In some cases, a deputy can act as relief for a superior, and, therefore, should be fully qualified in the position. Deputies generally can be assigned to the Incident Commander, EOC director, General Staff, and branch directors.

Person responsible to the Compensation/Claims Unit Leader for administrative matters arising from serious injuries and fatalities occurring on the incident.

Radio equipment with transmitters in mobile units on the same frequency as the base station, permitting conversation in two directions using the same frequency in turn.