An atmospheric index used to indicate the potential for wildfire growth by measuring the stability and dryness of the air over a fire.

A vascular plant that has a usually continuous central internal stand of spongy tissue in the stem.

A number related to the potential number of firebrands to which a given area will be exposed during the rating day.

In smokejumping, rappelling, and paracargo operations, the individual responsible for selecting drop target and supervising all aspects of dropping smokejumpers, rappellers, or cargo.

Readily changeable into vapor at low temperatures.

An offender who sets two fires at one site, at the same time, in a single event.

To drop retardant in such a way that the load slightly overlaps and links a previous drop. "Extend your last drop."

The symbol of the Cooperative Forest Fire Prevention Program since 1945. Smokey's image is protected by US Federal Law and is administered by the USDA Forest Service, the National Association of State Foresters and the Ad Council.

An area of relatively low atmospheric pressure in which winds tend to move in a counterclockwise direction, spiraling in toward the low's center.

The organizational unit responsible for the incident activities.