Which factors influence the effectiveness of smoke?

• A. Weather, Atmospheric Stability, Wind Speed, and Wind Direction
• B. Weather and Wind Conditions
• C. Terrain and Lighting
• D. Time of Day and Color

Answer: (B)

Smoke effectiveness hinges on how the atmosphere moves and behaves. The best answer shows that weather and wind conditions drive how a smoke screen forms, where it travels, and how long it lasts. Wind direction is the path the smoke plume follows, so you need a favorable direction to cover the intended area. Wind speed matters too: too slow and the smoke may not spread adequately or may pool; too fast and it can blow past the target or disperse too quickly. Weather encompasses factors like humidity, temperature, and precipitation, which influence how densely the smoke burns and how long it remains visible. Humidity and temperature can affect plume buoyancy and persistence, while rain or high humidity can help dissipate or wash out smoke.

Terrain and lighting can affect how clearly you observe the smoke, and time of day or color can change perception, but they don’t govern the smoke’s physical behavior.