For anyone wanting to use this with Juiced Patch, I've made a fork with additional tweaks below (shader overrides not compatible with Juiced and thus not carried over, tweaks to make lighting resemble SR1 better, etc)
Just drag the SR1 Weather Folder from your extractor to your SR 2 /mods/ folder and add mods/SR1 Weather to your loose.txt. Also check that the "DisableSkyRefl" flag in your Juiced.ini is set to 1 for extra authenticity.