C:\Program Files\Lockheed Martin\Prepar3D v4\SimObjects\Ground\Weather\
C:\Program Files\Lockheed Martin\Prepar3D v4\Weather\ p3dwx download
It retrieves real-world weather data (METARs, TAFs, and upper-air data) from reputable sources and injects it into the simulator in a way that simulates realistic cloud formations, correct wind shear, turbulence, and visibility layers. correct wind shear
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Upon first launch, the tool may ask you to locate your Prepar3D.exe .