Large fire whirls have the intensity of a small tornado. Fire whirls range in size from less than one foot to more than 500 feet in diameter. Spinning vortex column of ascending hot air and gases rising from a fire and carrying aloft smoke, debris, and flame. Often characterized by destructively violent surface indrafts, near and beyond the perimeter, and sometimes by tornado-like whirls. Violent convection caused by a large continuous area of intense fire. In-ground fires, the fire front may be mainly smoldering combustion. Unless otherwise specified, the fire front is assumed to be the leading edge of the fire perimeter.
The part of a fire within which continuous flaming combustion is taking place. The long narrow extensions of a fire projecting from the main body.Ī natural or constructed barrier used to stop or check fires that may occur or to provide a control line from which to work. Predictability is difficult because such fires often exercise some degree of influence on their environment and behave erratically, sometimes dangerously.Ī person who fells trees. One or more of the following is usually involved: high rate of spread, prolific crowning and/or spotting, presence of fire whirls, strong convection column. "Extreme" implies a level of fire behavior characteristics that ordinarily precludes methods of direct control action. These situations may or may not result in injury. An entrapment may or may not include the deployment of a fire shelter for its intended purpose. This barrier is similar to a greenbelt in that it is usually used for other purposes such as agriculture, recreation areas, parks, or golf courses.Ī single tree or a tiny clump of trees that is burning from the bottom up.Ī unit of linear measurement equal to 66 feet.Ī method of controlling a partly dead fire edge by carefully inspecting and feeling with the hand for heat to detect any fire, digging out every live spot, and trenching any live edge.īureau of Indian Affairs firefighter is conducting burnout operations with a drip torch.Ī situation where personnel is unexpectedly caught in a fire behavior-related, life-threatening position where planned escape routes or safety zones are absent, inadequate, or compromised.
The dropping of fire retardants or suppressants from specially designed buckets slung below a helicopter.Īn area of reduced vegetation that separates wildlands from vulnerable residential or business developments. Blow-ups are often accompanied by violent convection and may have other characteristics of a firestorm.
A Type 1 Helicopter supports wildland firefighters during the Pillar Falls Fire in Idaho.Ī sudden increase in fire intensity or rate of spread is strong enough to prevent direct control or to upset control plans.
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