The fuels, weather and topographical conditions of a specific fire scene or area of the fire scene at the time of fire passage.

Photographs from a lookout point, bearing azimuth and vertical angle scales, to assist in locating fires with a firefinder.

Weight of an aircraft/engine including the structure, power plant, all fixed equipment, all fixed ballast, unusable fuel, undrainable oil, and total quantity of hydraulic fluid.

That part of the fire on which work is started when suppression crews arrive.

Condition of the atmosphere in which the temperature decrease with increasing altitude is less than the dry adiabatic lapse rate. In this condition, the atmosphere tends to suppress large-scale vertical motion.

A net attached by a lanyard to a helicopter cargo hook and used to haul supplies.

Term used in resource planning/following to estimate time spent between points.

A level of certainty that is feasible but does not rise to the level of probable.

Preburning of fuels adjacent to a control line before igniting a prescribed burn. Blacklining is usually done in heavy fuels adjacent to a control line during periods of low fire danger to reduce heat on holding crews and lessen chances for spotting across control line. In fire suppression, a blackline denotes a condition where there is no unburned material between the fireline and the fire edge.

Regional climate under the predominant influence of the sea, that is, a climate characterized by marine air; the opposite of a continental climate.