Device commonly used to collect and permit measurement of any form of rain and snow sufficiently heavy to have fallen to the earth's surface.

Specific portion of the fire on which fire retardant or water is to be dropped by airtankers or helitankers.

Target area for airtankers, helitankers, cargo dropping.

External diameter of a cylinder or tube, conductor, or coupling as distinguished from the internal diameter.

An area over an incident, whether within an FTA or TFR, where aviation operations are taking place.

Climate characterized by (a) a long winter-spring dry season which includes a "cold season" followed by a short "hot season" immediately preceding the rains, (b) a summer and early autumn rainy season which is usually very wet (but highly variable from year to year), and (c) a secondary maximum of temperature immediately after the rainy season.

The process of determining the ignition source, materials first ignited, ignition factors, and party responsible for a fire.

Blade attachment with long teeth specially suited to ripping and piling brush with minimum inclusion of soil.

A one-character code indicating whether or not fine fuels are wet or dry.

The building block of foam; bubble characteristics of water content and durability influence foam performance.