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NWCG Glossary of Wildland Fire (PMS 205)

Term Steward Status Definition
invasive concern ISSC Invasive Species Subcommittee Approved A list of invasive species that are cause for concern related to the use of water sources.
inventoried resources IOSC Incident Operations Subcommittee Archived Assigned resources which have checked in at the incident.
inversion FMSC Fuels Management Subcommittee, IWSC Incident Weather Subcommittee Approved Atmospheric inversion. The departure from the usual increase or decrease with altitude of the value of an atmospheric property. In fire management usage, nearly always refers to an increase in temperature with increasing height. Also, the layer through which this departure occurs (also called inversion layer.) The lowest altitude at which the departure is found is called the base of the inversion.
investigator-in-charge ARMS Aviation Risk Management Subcommittee Approved The NTSB designated IIC organizes, conducts, controls, and manages the field phase of the investigation. The IIC has the responsibility and authority to supervise and coordinate all resources and activities of all personnel, both Board and non-Board, involved in the on-site investigation. The IIC continues to have considerable organizational and management responsibilities throughout later phases of the investigation, up to and including Board consideration and adoption of a report or brief of probable cause(s). Note: the NTSB determines probable cause(s); DOI/USFS determine contributing factors.   (See 49 CFR (NTSB) 830/831)
iritis EMSC Emergency Medical Subcommittee Approved Inflammation of the iris of the eye.
Iron Pipe Thread (IPT) ETSC Equipment/Technology Subcommittee Approved A tapered thread standard that is used for connecting various sizes of rigid pipe. This standard may be referred to as tapered iron pipe thread (TIPT), National pipe thread (NPT), iron pipe thread (IPT), or iron pipe standard thread (IPS). With tapered thread, the threads and pipe sealant perform the seal at the connection. This is opposed to straight thread connectors which use a gasket to form the seal. 
is available (water source) Approved Indicates that a water source is available for fire purposes.
is location tracking enabled IMC Integration Management Committee, DCSC Dispatch Coordination Subcommittee Approved Indicates whether a resource's location (geometry object/shape) is being updated by a real-time GPS tracking such as AVL (Automated Vehicle Locator).
is national resource IMC Integration Management Committee, DCSC Dispatch Coordination Subcommittee Approved Indicates whether a resource is a National Resource for use in Initial Response.
is primary capability AMC Aviation Management Committee, ETSC Equipment/Technology Subcommittee Approved Indicates that the capability is the primary capability for the equipment or aircraft.
is quarantined (incident) IMC Integration Management Committee Indicates whether an incident of type WF is potentially conflicting with another incident of type WF.
is quarantined (overhead) IMC Integration Management Committee, DCSC Dispatch Coordination Subcommittee Approved Indicates whether a resource is potentially in conflict with another resource of the same kind, based on the overhead conflict detection rules
is valid (resource) IMC Integration Management Committee, DCSC Dispatch Coordination Subcommittee Approved Indicates whether a resource is valid for use in Initial Response. Invalid resources should be removed from the data stream
is visible GISC Geospatial Information Subcommittee Approved Provides a flag for mapping display.
island FMSC Fuels Management Subcommittee Approved An unburned area within a fire perimeter.
isobar IWSC Incident Weather Subcommittee Approved A line connecting points of equal atmospheric pressure on a weather map.
isotherm IWSC Incident Weather Subcommittee Approved A line connecting points of equal temperature on a weather map.
isothermal layer IWSC Incident Weather Subcommittee Approved Layer through which temperature remains constant with elevation.
jacket (hose) MFES Mobile Fire Equipment Subcommittee Approved A seamless, tubular, woven fabric used as the outer covering of a hose.
jackpot burn FMSC Fuels Management Subcommittee Approved A fire treatment type. A prescribed fire to deliberately burn natural or modified concentrations (jackpots) of wildland fuels under specified environmental conditions, which allows the fire to be confined to a predetermined area and produces the fireline intensity and rate of spread required to attain planned resource Management Objectives.
jettison AMC Aviation Management Committee Approved Disposing of cargo, fuel, water or retardant overboard to lighten an aircraft or to improve its stability.
job aid PMC Fire Planning Management Committee, QMC Qualifications Management Committee, QSSC Qualifications Systems Subcommittee, LMC Logistic and Equipment Management Committee Approved Detailed information needed to complete each task including step-by-step explanations, checklists, diagrams and other relevant information. Job aids are for use by trainees as an on-the-job training tool and as a field operational tool for qualified personnel.
job hazard analysis SRC Safety/Risk Management Committee Approved A job hazard analysis identifies hazards associated with work projects and worksites, and identifies protective equipment or modified work procedures needed.
Joint Information Center (JIC) QMC Qualifications Management Committee, NISC NIMS Integration Subcommittee Pending A facility established as the central point of contact for news media and interest parties to coordinate incident information activities at the scene of the incident. Public information officials from all participating federal, state, and local agencies should collocate at the JIC. 
Joint Information System (JIS) QMC Qualifications Management Committee, NISC NIMS Integration Subcommittee Pending A system that integrates incident information and public affairs into a cohesive organization designed to provide consistent, coordinated, timely information during crisis or incident operations.
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