An unfinished preliminary control line hastily established or constructed as an emergency measure to check the spread of fire.

Factors that make up fuels such as compactness, loading, horizontal continuity, vertical arrangement, chemical content, size and shape, and moisture content.

One of four designations of seasonal plant development used in the 1988 version of NFDRS.

Fuels above ground and their vertical continuity, which influences fire reaching various levels or vegetation strata.

Additional crew member required for accomplishment of the mission such as flight attendant, smokejumper/rappel spotter, cargo loadmaster, helicopter manager, etc. These positions usually do not require any Airman Certificate(s) or a flight physical. Referred to as a Qualified Non-Crew Member in the CFR.

Private sector personnel, vendor or business contracted to provide goods and services to a government agency.

An application of fire danger rating to support regulation of contractors involved in land management activities for fire prevention purposes in the Pacific Northwest.

Generally considered only photochemical air pollution. Originally meant a combination of smoke and fog.

Any agent used to extinguish the flaming and glowing phases of combustion by direct application to the burning fuel.

A series of lines of fire ignited near and up wind (or downslope) of a firebreak or backing fire so they burn with the wind (or upslope) toward the firebreak or backing fire.