Historic Flight Tracking and Worldwide weather

Good morning - I’ve been looking at a historical flight from Japan to the LAX. I’ve noticed that when I go back further than 7 days I no longer see the “Worldwide Weather” overlay. I suspect this is based on my account type. When I do see the weather, its static, not changing during the playback. From another blog entry I see that they weather overlay is selected based on the midpoint of the flight, too bad its not animated with the flight. What is the source for the Worldwide weather overlay?
Thanks in advance!

A good worldwide weather alternative as a separate source is

Thanks Craig for sharing this link.