Often, to prove a UFO report is really about a wind-blown object, it is necessary to access historic wind data for a certain location and a certain altitude.
Wind direction in degrees has 0 for North, 90 for East, 180 for South, 270 for West, etc. Wind speed is often given in knots.
You can also fill out a form and download data from Copernicus, the Earth Observation component of the European Union’s Space programme, via the European Centre for Medium-Range Weather Forecasts:
The radiosonde is a small instrument package that is suspended below balloon filled with either hydrogen or helium. As the radiosonde is carried aloft ... Read even more
