The potential fire loss a community is willing to accept rather than provide resources to reduce such losses.

Distance equal to the wingspread of the airtanker being used; used for corrections right or left of the flight path.

A wildland fire whose activity is determined by the convection column.

In the 1978 version of NFDRS, the herbaceous stage when herbaceous fuel moisture falls to 30% or less.

In the context of wildland fire, a prescription is measurable criteria that define conditions under which a prescribed fire may be ignited. Prescriptions may also be used to guide selection of management responses to wildfire to define conditions under which management actions are most likely to achieve incident management objectives. Prescription criteria typically describe environmental conditions such as temperature, humidity and fuel moisture, but may also include safety, economic, public health, geographic, administrative, social, or legal considerations. 

Water or fire retardant projected directly from the nozzle (as contrasted with a fog or spray cone), provided by a solid stream orifice or by adjusting a fog jet into a straight stream pattern.

System of radio navigation in which any magnetic bearing relative to a special radio transmitter on the ground may be chosen and flown by an aircraft pilot.

Two or more separate points of fire origins at a fire scene; strong indication of arson.

System for airplane landing in which the pilot is guided by radio beams.

Light given off by burning gasses during the combustion process.