Not just wind speed, but all kinds of weather data can be extracted from radiosonde recordings. The data output is called a Skew-T Log-P graph. Some examples of how to interpret them at https://www.weather.gov/source/zhu/ZHU_Training_Page/convect...

There are of course several different global weather models that predict the behavior of the atmosphere, and it is a lot more complicated than just interpolating past data. But they all do rely on radiosonde data for daily calibration of actual atmospheric conditions.