Period of the year that normally comprises the fire season based on historical fire occurrence.

Objects displaying more stain deposits on the exposed surface of the object than on the protected surface of the object indicating the direction of fire progression at that location. One of the 11 NWCG categories of fire pattern indicators.

Accumulation in the forest of living or dead (mostly woody) material that is added to and rearranged by human activities such as harvest, cultural operations, and land clearing.

Self-leveling helibucket slung under a helicopter which can be filled by hovering over a water source.

A mixture of chemicals designed to produce heat, light, gas, smoke or noise.

An identifiable association of fuel elements of distinctive species, form, size, arrangement, or other characteristics. General fuel groups are grass, brush, timber, and slash.

Weather conditions which influence fire ignition, behavior, and suppression.

Partly decayed material, such as old wood, in which fire can smolder unless it is carefully mopped up and extinguished. A good receptor for firebrands when dry.

The taking or keeping of a person in custody by legal authority, especially in response to a criminal charge.

Absolute maximum allowable gross weight for an aircraft as established by the manufacturer and approved by the FAA.