This is yet another weather engine for Microsoft Flight Simulator X and Prepar3D.
It depicts the real live weather as close as it gets, taking into account the 'immersion factor' and quirks of FSX/P3D. Thus, you can expect that the results are not only accurate but also depicted in a way that looks beautiful!
What does that actually mean? In principle, FSX/P3D (with replacement textures) is capable of visualizing impressive weather. But the mere injection of unaltered METAR reports into stations provided by FSX/P3D delivers disappointing results. To overcome these shortcomings, FSXWX/P3DWX generates its own weather grid system and enhances the weather with regard to its presentation in FSX/P3D. By this means, unpleasant cloud depictions are avoided and the weather looks more vivid although it might be necessary to slightly relax the accuracy of the weather reports for that.
Another feature of is the decoupling of wind injections into FSX/P3D from the rest of the weather by using a unique technique with FSUIPC offsets. Hereby, it is possible to control the wind on a realtime basis with a custom wind module in the background which leads to super smooth wind transitions (lateral and vertical) as well as custom wind gusts, turbulence and variance. However, this is only available in FSXWX - not P3DWX.
Also noteworthy: FSXWX/P3DWX is specifically designed for complex and 'sensitive' addon jetliners like the PMDG NGX & 777 or Flight Sim Labs A320-X to provide a comprehensive, bug-free and gapless weather from take-off to landing. This includes scaled (but not simply deactivated!) weather effects like turbulences and gusts which I think are essential for the flying experience.