Relatório do Acidente ocorrido no Incêndio Florestal de Yarnel Hill

Direct: Any treatment applied directly to burning fuel such as wetting, smothering, or chemically
quenching the fire or by physically separating the burning from unburned fuel. Known more fully
as “Direct Attack.”
Fusees: A colored flare designed as a railway warning device, widely used to ignite backfires and
other prescribed fires.
Head Fire: A fire spreading or set to spread with the wind. (Synonym: Advancing Fire)
Head of a Fire: The most rapidly spreading portion of a fire’s perimeter, usually to the leeward or
up slope.
Heel of a Fire: The area of the fire with the lowest rate of spread.
Indirect: A method of suppression (known more fully as “Indirect Attack”) in in which the control
line is located some considerable distance away from the fire's active edge. Generally done in the
case of a fast-spreading or high-intensity fire and to utilize natural or constructed firebreaks or
fuelbreaks and favorable breaks in the topography. The intervening fuel is usually backfired; but
occasionally the main fire is allowed to burn to the line, depending on conditions.
Outflow: Air that flows outward from a thunderstorm.
Point Protection: Firefighting tactics that are specific to a given location, usually used for
structure protection where individual structures are being protected instead of large areas.
Red Flag Warning: A warning in which critical fire weather conditions are either occurring or will
occur shortly. A combination of strong winds, low relative humidity, and warm temperatures will
create explosive fire growth potential.
Safety Zone: An area cleared of flammable materials used for escape in the event the line is
outflanked or in case a spot fire causes fuels outside the control line to render the line unsafe. In
firing operations, crews progress so as to maintain a safety zone close at hand allowing the fuels
inside the control line to be consumed before going ahead. Safety zones may also be constructed
as integral parts of fuelbreaks; they are greatly enlarged areas which can be used with relative
safety by firefighters and their equipment in the event of blowup in the vicinity.
Square Up: To burn out fuel along the control line to a point that is even with the lowest point of
active fire, then “squaring” up the corner.
Staff Ride: A case study of a previous incident that is conducted on the actual physical site where
the incident occurred. A staff ride is an experiential learning method that involves three distinct
parts: a preliminary study, a site visit, and a post-visit integration session.
Tone Guard: Controls access to a specific frequency on a two-way radio. Tone guard provides a
way for radio users to transmit and monitor only the transmissions with the same tone. A radio will
only activate if another radio is transmitting with the same tone guard.
Yarnell Hill Fire Serious Accident Investigation 110