I've got a weather problem too.. well, actually the lack of weather. I'm running GWX and got the SH3 Weather mod, and selected heavy rain with moderate winds, just to see what the weather effects were like. And I'm on the bridge, sound of rain pelting down.. but skies are cloudy-ish, partly cloudy actually and suns shining.
And no rain. Now I'm running the Weather mod, selecting the desired options, and selecting GENERATE. Then, running SH3Commander to load SH3 with my selected career, my game loads and I select the saved game I want. Now I wonder if this mod only works when your starting a career, and not during a career.
I remember playing stock SH3 a while back, and once my lads had their raincoats on, and I'm sure there was rain, you could see it.
My video card is a Gainward 7800GS 512Mb running 9147 drivers (Nvidia)
Thanks guys... and Happy New Year