EASA subject
Meteorology
Wind, visibility, humidity, clouds
Weather directly affects UAS stability, battery consumption, and safe landing.
Key concepts
- Wind
- Gusts and crosswind reduce stability; know your UAS wind limits.
- Visibility
- Fog, rain, and snow degrade VLOS and UAS visibility.
- Inversion / advection fog
- A temperature inversion creates fog — sudden visibility reduction.
Common mistakes
- Flying in strong wind "because the app allows it"
- Ignoring the weather forecast
Exam traps
- Wind limits for the UAS
- Humidity and LiPo batteries
- Low-pressure weather systems
Real-world example
Sudden fog — the pilot loses sight of the UAS and orientation.