I can now confirm that this is a server issue that is most likely tied to date and time. This has been happening almost consistently between 05:00 - 11:00 UTC (overnight here in Eastern US). Interestingly, I have also found out that this might be one of the reasons for abysmal low fps! As the clouds disappeared (wind data however, still correct), something in the sim slowly grinds to a halt until there is literally no GPU utilization at all. (1-5FPS)
I dont know if anyone can confirm this?