Any situation in which it is highly dangerous to fight fire.

The use of water, foam or retardant along a control line in advance of the fire. Often used where ground cover or terrain is considered best for control action.

The ICS title for a member of the Command Staff authorized to make decisions and take action related to his/her area of responsibility.

Recording instrument combining, on one paper record, the variation of dry-bulb temperature and relative humidity as a function of time.

Arithmetic average of all fire intervals in a given area over a given time.

Prescribed fire to control fungal infection (brown spot disease) of longleaf pine (Pinus palustris) in the "grass" (small seedling) stage.

The field location where the primary functions of incident command are performed. The ICP may be co-located with the Incident Base or other incident facilities.

The date and time that initial action was taken by the first resources to arrive at a fire.

The initial decisions and actions taken in reaction to a reported incident.

Belt-mounted case with pockets fitted for anemometer, compass, sling psychrometer, slide rule, water bottle, pencils, and book of weather report forms. Used to take weather observations to provide on-site conditions to the fire weather forecaster or fire behavior analyst. Observations include air temperature, wind speed and direction, and relative humidity.