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Terms and Definitions
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Haines Index
An atmospheric index used to indicate the potential for wildland fire growth by measuring the stability and dryness of the air over a fire.
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Hand Line
A fireline built with hand tools.
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Hazard Reduction
Any treatment of a hazard that reduces the threat of ignition and fire intensity or rate of spread.
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Head of a Fire
The side of the fire having the fastest rate of spread.
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Heavy Fuels
Fuels of large diameter such as snags, logs and large limb wood, that ignite and are consumed more slowly than flash fuels.
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Helibase
The main location within the general incident area for parking, fueling, maintaining, and loading helicopters. The helibase is usually located at or near the incident base.
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Helispot
A temporary landing spot for helicopters.
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Helitack
The use of helicopters to transport crews, equipment and fire retardants or suppressants to the fireline during the initial stages of a fire.
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Helitack Crew
A group of firefighters trained in the technical and logistical use of helicopters for fire suppression.
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Holding Actions
Planned actions required to achieve wildland fire use or prescribed fire management objectives. These actions have specific implementation timeframes for fire use actions but can have less sensitive implementation demands for suppression actions. Also, the name of a musical group made up of NPS Fire employees. Download Audio
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Holding Resources
Firefighting personnel and equipment assigned to do all required fire suppression work following fireline construction but generally not including extensive mop-up.
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Hose Lay
Arrangement of connected lengths of fire hose and accessories on the ground, beginning at the first pumping unit and ending at the point of water delivery.
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Hotshot Crew
A highly trained fire crew used mainly to build fireline by hand.
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Hotspot
A particularly active part of a fire.
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Hotspotting
Reducing or stopping the spread of fire at points of particularly rapid rate of spread or special threat, generally the first step in prompt control, with emphasis on first priorities.
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