Evaluation of a dwelling and its immediate surrounding to determine its potential to escape damage by an approaching wildland fire. Includes the fuels and vegetation in the yard and adjacent to the structure, roof environment, decking and siding materials, prevailing winds, topography, fire history, etc., with the intent of mitigating fire hazards and risks. 

The horizontal direction to or from any point, usually measured clockwise from true north, or some other reference point through 360 degrees.

Lowest temperature at which the vapor of a combustible liquid can be made to ignite in air.

Areas in the fire where fuel accumulations, heavy fuels, or higher fuel moisture content cause the fire to burn for an extended period of time.

Specially designed tank, generally of fabric or metal, fitted closely to the bottom of a helicopter and used for transporting and dropping suppressants or fire retardants.

Irregular motion of the atmosphere usually produced when air flows over a comparatively uneven surface such as the surface of the earth; or when two currents of air flow past or over each other in different directions or at different speeds.

In FireFamily Plus, a day with both a weather observation and at least one fire.

In FireFamily Plus, a day with both a weather observation and at least one large (as defined by the user) fire.

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.