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Category: Terms-Definitions

  • Type II Engine

    A fire engine designed to carry and pump water for use in fire suppression. Also known as a "Tender" or "Water Tender".

  • Type III Engine

    A fire engine designed primarily for fighting wildland fires. These engines are usually able to traverse more rugged terrain than Type I and Type II engines.

  • Understory burn

    A controlled burn of fuels below the forest canopy, intended to remove fuels from on-coming or potential fires.

  • Urban interface

    The Interface zone where man-made structures inter-mingle with wildlands, creating risk of structural involvement in a wildland fire incident and wildland fire involvement in structure fires, each of which requires different equipment, training and tactics.

  • Watch out situations

    A list of 18 situations for firefighters to be aware of, which signal potential hazards on the fire line

  • Water tender

    Any ground vehicle capable of transporting specified quantities of water.

  • Wet line

    Temporary control line using water or other fire retardant liquid to prevent a low-intensity fire from spreading in surface fuels or to knock down a more intense fire.

  • Widowmaker

    Any branch or treetop that is poorly or no longer attached to a tree, but still tangled overhead

  • Wildfire

    An unplanned, unwanted wildland fire, including unauthorized human-caused fires, escaped wildland fire use events, escaped prescribed fire projects, lightning strikes, downed power lines, and all other wildland fires where the objective is to put the fire out.

  • Wildland

    An area in which development is essentially nonexistent, except for roads, railroads, power lines, and similar transportation facilities. Structures, if any, are widely scattered.

  • Wildland fire engine

    Fire apparatus specialized for accessing wildland fires with water, equipment and small crew. Size and agility of these units may also be useful for other urban missions.

  • Wildland Fire Use fires (WFU fires)

    naturally-ignited wildland controlled burns that are managed for purposes of achieving specific previously-defined resource management objectives.[3]