Interagency Single Engine Air Tanker Operations Guide - National ...

INTERAGENCY SINGLE ENGINE AIR TANKER OPERATIONS GUIDE
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Radio cache: May consist of a number of portable radios, a base station and in
some cases a mobile repeater, all stored in a predetermined location for dispatch
to an incident.
Rate of spread: The relative activity of a fire in extending its size, expressed as
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.
Rear of the fire: Usually opposite from the head, closest to the origin and
nearest the source of the wind. The rear edge of the fire is usually burning
slower than other sectors of the fire. Sometimes called the heel or base of the
fire.
Reburn: (1) Subsequent burning of an area in which fire has previously burned
but has left flammable fuel that ignites when burning conditions are more
favorable. (2) An area that has reburned.
Reciprocating: Internal combustion, as opposed to turbine, engine.
Red Flag Warning: Used to warn of impending, or actually occurring critical
weather conditions that could result in extensive wildland fire activity. Its
issuance denotes a high degree of confidence that weather and fuel conditions
consistent with local Red Flag Event criteria will occur in 24 hours or less.
Relative humidity: The ratio of the amount of moisture in a given volume of
space to the amount that volume would contain if it were saturated. The ratio of
the actual vapor pressure to the saturated vapor pressure.
Resistance to control: The relative difficulty of constructing and holding a
fireline as affected by resistance to line construction and by fire behavior; also
called difficulty of control.
Resources: All personnel and major items of equipment available, or
potentially available, for assignment to emergencies; described by kind and type.
Retardant (long-term): Contains a chemical which alters the combustion
process and causes cooling, smothering/insulating of fuels; remains effective
until diluted or rinsed off by precipitation.
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