In the 1988 version of NFDRS, a code scaled from 0 to 20 representing the greenness of grasses and shrubs from near dead to maximum greenness.

An NDVI-derived image of vegetation greenness compared to a very green reference such as a golf course.

The sequence or order of events that bring a competent ignition source, fuel first ignited and oxidant together allowing them to react with each other.

Activities undertaken in advance of fire occurrence to help ensure more effective fire suppression. Activities includes overall planning, recruitment and training of fire personnel, procurement and maintenance of firefighting equipment and supplies, fuel treatment and creating, maintaining, and improving a system of fuel breaks, roads, water sources, and control lines. 

The date/time the trainee experience was evaluated.

A description of how the resource performed on an incident. The evaluation is focused on the specific capacity the resource was required to perform.

A person designated to detect and report fires from a vantage point.

Likelihood that a wildfire capable of causing considerable damage will occur.

The gases, smoke, and debris that rise slowly from a fire while being carried along the ground because the buoyant forces are exceeded by those of the ambient surface wind.

The rising column of gases, smoke, fly ash, particulates, and other debris produced by a fire. The column has a strong vertical component indicating that buoyant forces override the ambient surface wind.