CoolP wrote on Sep 6^th, 2012 at 6:10am:

You name. And to be honest, none of my fancy weather addons would work without FSUIPC helping it. Well, thanks to the 'funny' FSX (and P3D) weather system and some rather sensible addon planes of course. The way weather gets injected into FSX and the instant switch of winds and temps is something unique. With small planes flying low, one just goes yikes! at times  :D but seeing the addon stuff flying S-turns over straight lines or just getting into engine trouble because the weather decided to flip to 12°C warmer withing a nanosecond is more than yikes!  ;D

The funny thing is all the weather addons can use fsuipc to inject weather in to the sim but they choose not to use that feature, instead we have to use simconnect which is worse way to inject weather in to the sim as it can cause fps drops when loading, the bad wind shifts and the stutters can also happen. I would be very happy if Rex or Active Sky gave the option to inject weather through fsuipc