The “weather radar” provided by the sim to display in those airliners in which it works is simply a static 2D representative bitmap image. It is is no way the type of image that would be displayed by a real aircraft weather radar. Aircraft weather radars have for decades had the ability to tilt and in some cases pan the antenna to get data from various points in 3-dimensional space ahead of the aircraft and provide imagery that more accurately represents rain and moisture content at various altitudes and bearings from the aircraft. Modern radars can do the same with a phased array antenna and limited if any physical antenna movement, and their electronics can process the reflections back from the radar to create a very detailed 3-D “map” of moisture and in some cases also wind and aerosols in the air.
There is nothing akin to this level of detail provided through the sim to aircraft displays. It is hoped that at some point in the coming year, MS/Asobo will have some discussions about this limitation with MeteoBlue, the sim’s weather data provider, so that some reasonable semblance of this kind of data can be presented for those aircraft that could make use of it. If that occurs, aircraft developers like PMDG, Fenix and others could then access the data and use it to create aircraft weather radar simulations much more akin to those available in the real things.