Landing necessitated by failure of engines, systems, or components which makes continued flight impossible and which may not result in damage.

Base map of the planning unit showing all roads, trails, heliports, and airfields existing and programmed for construction.

A numerical rating for specific fuel types, indicating the relative probability of fires starting and spreading, and the probable degree of resistance to control; similar to burning index, but without effects of wind speed.

Item for storing drying fire hose.

That period of the fire season during which fires are expected to ignite most readily, to burn with greater than average intensity, and to create damages at an unacceptable level.

A woody perennial plant differing from a perennial herb by its persistent and woody stem; and from a tree by its low stature and habit of branching from the base.

Fine cracking of glass, usually from heat of fire.

The greatest 5-second average wind speed during the previous hour that exceeded 25 knots.

An aircraft of 12,500 pounds (5,669 kg) or less, maximum certificated takeoff weight.

The term for horizontal air currents merging together or approaching a single point, such as at the center of a low pressure area producing a net inflow of air. When this occurs in the lower atmosphere, the excess air is removed by rising air currents. Expansion of the rising air above a convergence zone results in cooling, which in turn often gives condensation (clouds) and sometimes precipitation.