The rise or fall in terrain measured in feet per 100 feet of horizontal distance measurement, expressed as a percentage.

Boles, stems, or limbs of woody material; that portion of the dead wildland fuel which is roughly cylindrical in shape.

Non-decomposed material, living or dead, derived from herbaceous plants.

A grouping of fire weather stations that experience the same weather change or trend. Zones are developed by the National Weather Service to assist NWS production of fire weather forecasts or trends for similar stations. Fire weather forecast zones are best thought of as a list of similar-weather stations, rather than an area on a map.

A unique identifier for the dispatch center with responsibility at the point of origin.

The chemical treatment on a hose jacket to resist organic growth that would deteriorate the hose jacket fibers.

A conventional relative measure of fineness as applied to yarns. Coarse yarns have low numbers and fine yarns have high numbers.

The maximum “operating pressure” of a component or system. Identified as “WP” on Forest Service-qualified fire hose. Also known as “rated pressure".

The pH content of a hose jacket determined after boiling in distilled water in a laboratory test.

The amount of deviation from a straight line when the hose is hydrostatically tested; usually expressed in inches.