So: the review by Jetjockey10 suggested that the real-life weather changed winds, precipitation and clouds, but advresgrpdev says only visibility. I am confused.
Yes, my software can only change visibility at the present time. This is a limitation of the IPACS SDK. I'm hopeful that as the IPACS SDK matures, additional capabilities such as control of wind, cloud layers, etc. will be available to external programs such as mine.