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Terms and Definitions
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Radiant Burn
A burn received from a radiant heat source.
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Radiant Heat Flux
The amount of heat flowing through a given area in a given time, usually expressed as calories/square centimeter/ second.
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Rappelling
Technique of landing specifically trained firefighters from hovering helicopters; involves sliding down ropes with the aid of friction-producing devices.
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Rate of Spread
The relative activity of a fire in extending its horizontal dimensions. It is expressed as a rate of increase of the total perimeter of the fire, as rate of forward spread of the fire front, or as rate of increase in area, depending on the intended use of the information. Usually it is expressed in chains or acres per hour for a specific period in the fire’s history.
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Reburn
The burning of an area that has been previously burned but that contains flammable fuel that ignites when burning conditions are more favorable; an area that has reburned.
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Red Card
Fire qualification card issued to fire rated persons showing their training needs and their qualifications to fill specified fire suppression and support positions in large fire suppression or incident organization. Also, sometimes referred to as IQCS card.
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Red Flag Warning
Term used by fire weather forecasters to alert forecast users to an ongoing or imminent critical fire weather pattern.
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Rehabilitation
The activities necessary to repair damage or disturbance caused by wildland fires or the fire suppression activity.
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Relative Humidity (Rh)
The ratio of the amount of moisture in the air, to the maximum amount of moisture that air would contain if it were saturated. The ratio of the actual vapor pressure to the saturated vapor pressure.
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Remote Automatic Weather Station (RAWS)
An apparatus that automatically acquires, processes, and stores local weather data for later transmission to the GOES Satellite, from which the data is re-transmitted to an earth-receiving station for use in the National Fire Danger Rating System.
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Resource Management Plan (RMP)
A document prepared by field office staff with public participation and approved by field office managers that provides general guidance and direction for land management activities at a field office. The RMP identifies the need for fire in a particular area and for a specific benefit.
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Resource Order
An order placed for firefighting or support resources.
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Resources
1. Personnel, equipment, services and supplies available, or potentially available, for assignment to incidents. 2. The natural resources of an area, such as timber, crass, watershed values, recreation values and wildlife habitat.
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Retardant
A substance or chemical agent which reduced the flammability of combustibles.
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Run (of a fire)
The rapid advance of the head of a fire with a marked change in fireline intensity and rate of spread from that noted before and after the advance.
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Running
A rapidly spreading surface fire with a well-defined head.
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