Drones offer alternative to balloons for weather research

Pre-programmed flights gather data at different altitudes then return to bases to recharge and download Weather happens in the boundary layer, the atmosphere from ground level to a few thousand metres, but this can be difficult to study in detail: weather stations are too low, and aircraft are expensive. Instrumented weather balloons are the traditional solution, and thousands are released every day. But these are at the mercy of the wind and use irreplaceable helium. Drones offer an…