FAA Part 107 Remote Pilot (UAG)OperationsEasy
A remote pilot is preparing for a sUAS flight near a remote mountain ridge. The weather forecast indicates a strong wind flowing up the slope. What atmospheric condition is this pilot most likely to encounter?
- ATemperature inversion.
- BAnabatic winds.
- CKatabatic winds.
- DSubsidence.
Show answer & explanationAnswer & explanation
Correct answer: B. Anabatic winds.
Anabatic winds are upslope winds caused by the warming of the mountain slope, which then heats the air above it, causing it to rise. Conversely, katabatic winds are downslope winds.
Why the other options are wrong
- A. A temperature inversion is a layer in the atmosphere where temperature increases with altitude, which can trap air, but doesn't directly describe upslope winds.
- C. Katabatic winds are downslope winds, typically occurring at night or in cold conditions.
- D. Subsidence is the sinking of air, which typically leads to clear skies and stable conditions.
Mountain Winds
Mountainous terrain can create localized wind patterns, primarily anabatic (upslope) and katabatic (downslope) winds, due to differential heating and cooling.
- Anabatic winds: Warm air rising up mountain slopes.
- Katabatic winds: Cold air flowing down mountain slopes.
- Can affect sUAS performance and stability.
Memory trick: Anna Climbs Up, Katie Slides Down