Way cool. I tried to make on like this a couple of days ago but couldn't find a map in the necessary cylindrical projection.

I don't know about anyone else, but I've found the refresh for this overlay gets flipped from "Periodically" to "Once." I've had similar problems with the national radar composite. I don't know how to fix it (it might be just on my PC), and Support has no idea either.

Too bad there aren't any time-stamps on the image. The one I'm looking at shows a big discrepancy, for example, in the midwest where the radar is showing some intense thunderstorms. I could be that the satellite image is approaching it's 3hour age limit, but I'm not sure it's not more out of date than that.