10km/hour is roughly 3m/s Stratus clouds produce steady rains, and cumulus clouds produce intense, stormy precipitation. If there are thunderstorms or heavy rain in the vicinity (Cumulonimbus!) , do not fly the drone. High wind, rain and lightning all can cause you to crash your drone. In exceptional cases, a flight above 120m from the closest point of the surface of the Earth is possible. Drones are allowed up to 15m above the height of an obstacle if the owner of the obstacle allows it (For instance, to inspect a windmill). OODA loop = Observe – Options – Decisions – Act MEUH = Meteo – Environment – UAS (drone check) – Humans/obstacles distance The link between a drone and the remote controller is called the C2 link (Command and Control