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NWCG Glossary of Wildland Fire (PMS 205)

Term Steward Status Definition
returned from assignment DCSC Dispatch Coordination Subcommittee Pending The resource has returned from the assignment but is not yet available for dispatch.
Reversible Siamese (SIMWYE) ETSC Equipment/Technology Subcommittee Approved Hose fitting that performs the functions of a Siamese or a wye (i.e., to combine the flow from two lines into a single line or to permit two lines to be taken from a single line).
Rheologic properties ETSC Equipment/Technology Subcommittee Approved Flow characteristics of liquid fire retardants, especially their cohesiveness or ability to hold together while falling through the air.
Rheology ETSC Equipment/Technology Subcommittee Approved Science of deformation and flow of fire retardants and other liquids, especially of the cohesiveness bodies and stress-strain relationship of their particles.
rich tool ETSC Equipment/Technology Subcommittee Approved A long-handled combination rake and cutting tool, the blade of which is constructed of a single row of mowing machine cutter teeth fastened to a piece of angle iron.
ridge (topographic) PMC Fire Planning Management Committee, QMC Qualifications Management Committee, QSSC Qualifications Systems Subcommittee, LMC Logistic and Equipment Management Committee Approved A long narrow elevation of land; a steep slope or similar range of hills or mountains.
ridge (weather) IWSC Incident Weather Subcommittee Approved An elongated area of relatively high atmospheric pressure extending from the center of a high-pressure region.
right angle transect FISC Fire Investigation Subcommittee Approved A method to document a fire scene using right angle measurements off of a base line.
ring fire FMSC Fuels Management Subcommittee Approved A fire started by igniting the full perimeter of the intended burn area so that the ensuing fire fronts converge toward the center of the burn. Set around the outer perimeter of a resource to establish a protective black-line-buffer.
rise MFES Mobile Fire Equipment Subcommittee Approved The height hose lifts from its original flat position once hydrostatic pressure is applied.
risk (agent) PMC Fire Planning Management Committee, QMC Qualifications Management Committee, QSSC Qualifications Systems Subcommittee, LMC Logistic and Equipment Management Committee, FMSC Fuels Management Subcommittee Approved A causative agent.
risk (fire danger) PMC Fire Planning Management Committee, QMC Qualifications Management Committee, QSSC Qualifications Systems Subcommittee, LMC Logistic and Equipment Management Committee, FMSC Fuels Management Subcommittee Approved A number related to the potential of firebrands to which a given area will be exposed during the rating day.
risk (harm or loss) PMC Fire Planning Management Committee, QMC Qualifications Management Committee, QSSC Qualifications Systems Subcommittee, LMC Logistic and Equipment Management Committee, FMSC Fuels Management Subcommittee Approved A chance of suffering harm or loss.
risk (ignition) PMC Fire Planning Management Committee, QMC Qualifications Management Committee, QSSC Qualifications Systems Subcommittee, LMC Logistic and Equipment Management Committee, FMSC Fuels Management Subcommittee Approved The chance of fire starting as determined by the presence and activity of causative agents.
risk assessment (fire planning) IFPC Interagency Fire Planning Committee Pending An appraisal of the interaction of hazard, exposure, and effects to a given set of values in a given area.
risk assessment (WUI) WMSC WUI Mitigation Subcommittee Approved Systematic process to comprehend the nature of risk, express and evaluate risk, with the available knowledge.
risk index FDSC Fire Danger Subcommittee Approved A number related to the probability of a firebrand igniting a fire.
Risk Management (RM) SRC Safety/Risk Management Committee Approved A continuous, five-step process that provides a systematic method for identifying and managing the risks associated with any operation.
risk source FISC Fire Investigation Subcommittee Approved Identifiable human activity that historically has been a major cause of wildfires on a protection unit; one of the eight general causes listed on the standard fire report.
risk source ratio FISC Fire Investigation Subcommittee Approved Portion of human-caused fires that have occurred on a protection unit chargeable to a specific risk source; calculated for each day of the week for each risk source.
rocker lug coupling ETSC Equipment/Technology Subcommittee Approved Hose coupling in which the lugs used for tightening or loosening are semicircular in shape and designed to pass over obstructions.
roll cloud IWSC Incident Weather Subcommittee Approved A turbulent altocumulus-type cloud formation found in the lee of some large mountain barriers. The air in the cloud rotates around an axis parallel to the range. Also sometimes refers to part of the cloud base along the leading edge of a cumulonimbus cloud; it is formed by rolling action in the wind shear region between cool downdrafts within the cloud and warm updrafts outside the cloud.
rotor AMC Aviation Management Committee Approved Assembly of airfoils (rotor blades), together with a hub and attachments, that rotates about an axis to provide lift and/or thrust on a helicopter.
rotor blast RWSC Rotor Wing Subcommittee Approved Air turbulence occurring under and around the main rotor of an operating helicopter.
rotor diameter AMC Aviation Management Committee Approved The main rotor arc in feet and inches (meters). Used for planning helispot clearance.
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