Info for all those that look at GRIB files (from www.grib.us for example), the meteo is currently off by 1 hour:
If you want to figure out the wind for 1300 UTC on OV you need to look at 1400 UTC in the GRIB. This might be interesting for large wind direction shifts near the center of high or low pressure systems.
I just verified my assumption to be true and thought I inform you for fairness. I will keep you up to date with what might be fixed/changed by Herve.