Meteorology and Low-Level Agricultural Flight
Weather Effects at Low Altitude
Agricultural flying occurs in the boundary layer where wind, turbulence, temperature inversions, and humidity strongly affect operations. Candidates must understand surface wind effects on drift, the danger of temperature inversions that trap spray and allow it to travel long distances, and the turbulence associated with thermals, tree lines, and buildings. High temperature and low humidity increase evaporation and drift potential.
Drift and Inversion Traps
A common trap is assuming that calm surface winds mean no drift risk; under an inversion, even light winds can carry fine droplets far off target. Another trap concerns crosswind limits: application accuracy degrades as crosswind increases, and questions often expect the answer that reduces drift through nozzle selection, lower pressure, larger droplets, or postponing the operation.
Worked Example
Rule of thumb: avoid applications when a strong inversion is present, typically indicated by clear skies, light winds, and rapid evening cooling. If a question describes stable air with light winds and high humidity near the ground, the correct answer is usually to delay until the inversion breaks.
Thunderstorms and Visibility
Know the hazards of thunderstorms, gust fronts, and reduced visibility from haze or smoke. Low-level operations leave little margin for downdrafts or wind shear. Watch for questions about the effect of density altitude on performance, which is meteorological as well as aircraft-related.