In FireFamily Plus, a day with both a weather observation and a number of fires equal to or greater than that determined by the user to be a significant workload.

The trunk of a tree.

Fire pattern indicators that are generally only visible when viewed within close proximity.

To travel over a given route to prevent, detect, and suppress fires. Includes interaction with the public for wildland fire prevention and educational purposes.

The average distance from the bottom of the litter layer to the top of the layer of fuel, usually the surface fuel.

Average height of surface fuels contained in the combustion zone of a spreading fire front.

The adjective classification of the sky when 5/10 or less of the sky is obscured by clouds.

A statement provided to the incident commander by the agency administrator delegating authority and assigning responsibility. The delegation of authority can include objectives, priorities, expectations, constraints and other considerations or guidelines as needed.

On-incident costs and off-incident costs. On-incident costs include caterer, shower units, mobile commissary, cache supplies, and materials, etc. Off-incident costs include expanded dispatch, buying teams, administrative payment teams, cache personnel, area command, transportation to/from incident, etc. 

An entity with specific capabilities or resources that support the primary agencies in executing the mission of the ESF.