@idefix37 I'm unable to reproduce the 3 fold discrepancy I was seeing last week. But here are some screenshots showing a 2x descrepancy for the same location, which is still pretty significant, especially for a forecast for the current time. This is a pretty big difference in visibility when hiking in the mountains.
I'm not exactly sure what it would mean for the grib file to be sent at lower resolution. It was previously mentioned as an explanation for why the interpolated value would be different at different zoom levels. Something seems to be more course at higher zoom levels.