A divergent wind field. Storms moving into a split field tend to lose strength. Winds are generally light in such a flow field.

Confirmation through the re-issuance of an incident qualification card that an individual has regained qualifications for a specified position that was lost through a lack of current experience. A key component in the certification or re-certification process is the subjective evaluation by the appropriate agency official of an individual's capability to perform in a position. 

A position-qualified individual who provides instruction to a trainee in the classroom, on-the-job, or on an incident. While many of the requirements of the trainer/coach are similar to the evaluator, it is important that the roles of training and evaluation remain separate. 

Carbon dust formed by incomplete combustion.

The ICS organizational level having responsibility for a major functional area of incident management (e.g., Operations, Planning, Logistics, and Finance/Administration).

A VHF/AM aircraft radio frequency (122.9 MHz) assigned by the FAA for use in air-to-air communications.

A colorless, odorless, nonpoisonous gas, which results from fuel combustion and is normally a part of the ambient air.

A forecast of the probability of occurrence of one or more of a mutually exclusive set of weather contingencies as distinguished from a series of categorical statements.

Process of extinguishing fire by the use of an agent that interrupts the chemical reactions in the combustion process.

A geographical area which is administratively defined and for which organized fire suppression activities are formally planned.