Thanks to everybody who alerted me to the GFS download problem. I got hold of Sam, and he fixed it within minutes. It was a bug resulting from preparing for the June 12 GFS changes. It’s working now, so WXSIMATE and WXSIM-Lite should both be fine now.
OK, working with Sam. I found that the barometric pressure is not being read correctly after the initial hour. We’re going to revert back to the current, official data. We’d switched to the parallel data, which is going to become the official data on June 12. Hopefully it will be OK shortly (maybe give this half an hour or so). Then we will experiment in the background to see what was happening with the parallel data.