I just made a few interesting observations that might be helpful to clarify the issue (please correct me in case I'm wrong):
- Both the VVOR game time and the NOAA server updates are affected by the daylight-saving time, i.e. the offset w.r.t. to UTC is +1 in winter time and +2 in summer time. The consequences are:
- NOAA server production times are (in case of the original t06z example): 09:17 - 10:37 UTC in winter, 08:17 - 9:37 UTC in summer.
- IMHO, the very instructive timescale figure in the Wiki is valid only in summer (game time = UTC+2).
- The time delay between NOAA file availability and their actual usage in the game is constant in winter/summer
- The recommended time tweak (thanks for the tip!) works excellent! What worked for me: Tweaking the time zone by +2, allowed me to download the first smoking hot t18 forcasts already at 22:30 CET / 21:30 UTC. Roughly speaking, an extra forcast advantage of 1.5 hours is possible for short-term forcasts (up to 24/36H), 1 hour for mid-term forcasts (120H).