Spotting Distance Maximum (4 digits) Distance estimated to best of ability, reference off of nearby geographic features, at the time and date recorded in the Observation Location Information section. Tolerance: ±500 feet. Plume Behavior (2 characters) A convection column generated by combustion (of wildland fuel). Tolerance: ±1 class. Table 127: Plume behavior codes and descriptions Code Name Description WV Plume well ventilated, Estimate to best of ability, at the time and rising, and dispersing high date recorded in the Observation Location above the burn Information section US Plume unstable with Estimate to best of ability, at the time and erratic behavior date recorded in the Observation Location Information section PD Plume is dropping and Estimate to best of ability, at the time and going downhill into the date recorded in the Observation Location valleys Information section IN Inversion Estimate to best of ability, at the time and date recorded in the Observation Location Information section Direction Azimuth (3 digits) Tolerance: ±45 degrees. Table 128: Plume direction units and descriptions Units Description Method Degrees The direction of the fire Estimate to best of ability referencing off of azimuth plume, in degrees, to the geographic features, at the time and date nearest 45 degrees recorded in the Observation Location Information section Plume Height (2 digits) Tolerance: ±1,000 feet.
Spotting Distance Maximum (4 digits) Distance estimated to best of ability, reference off of nearby geographic features, at the time and date recorded in the Observation Location Information section. Tolerance: ±500 feet. Plume Behavior (2 characters) A convection column generated by combustion (of wildland fuel). Tolerance: ±1 class. Table 127: Plume behavior codes and descriptions Code Name Description WV Plume well ventilated, rising, and dispersing high above the burn Estimate to best of ability, at the time and date recorded in the Observation Location Information section US Plume unstable with erratic behavior Estimate to best of ability, at the time and date recorded in the Observation Location Information section PD Plume is dropping and going downhill into the valleys Estimate to best of ability, at the time and date recorded in the Observation Location Information section IN Inversion Estimate to best of ability, at the time and date recorded in the Observation Location Information section Direction Azimuth (3 digits) Tolerance: ±45 degrees. Table 128: Plume direction units and descriptions Units Description Method Degrees azimuth The direction of the fire plume, in degrees, to the nearest 45 degrees Estimate to best of ability referencing off of geographic features, at the time and date recorded in the Observation Location Information section Plume Height (2 digits) Tolerance: ±1,000 feet.