A raging, destructive fire. Often used to connote such a fire with a moving front as distinguished from a fire storm.

A code reflecting the moisture content of the foliage and small twigs [less than 1/4 inch (0.6 cm)] of living woody plants.

The intersection of lines of reference, usually expressed in degrees/minutes/seconds of latitude and longitude, used to determine or report position or location.

An area cleared to mineral soil for piling unburned fuels.

Water that contains a thickening agent to reduce surface runoff; tends to cling to burning fuels and spread in layers that are several times thicker than plain water, thereby having an increased capacity to absorb heat, cool fuel, and exclude oxygen.

A generic term used to describe foam systems consisting of an air compressor (or air source), a water pump, and foam solution.

A WIMS file that contains all the information defined for a weather station.

Any part of a fireline rendered useless by a breakover of the fire.

The leading edge of a relatively warm air mass which moves in such a way that warm air replaces colder air that moves away from a region. Winds associated with warm frontal activity are usually light and mixing is limited. The atmosphere is relatively stable when compared to cold front activity.

Amount of heat required to raise 1 pound of water 1 degree Fahrenheit (from 59.50 to 60.50 F), measured at standard atmospheric pressure.