Seems a fellow user has found a possible solution to this bug. Updating the posting accordingly:
So before I log this as a bug, can anyone else seem to confirm that cloud bases in the new METAR injection system are being rendered at the MSL altitude rather than AGL altitude? I’m well aware that in real life, cloud bases in METARs are strictly AGL. Rather, it would seem after a few tests, that in the sim they are all being rendered as MSL altitudes.
For example, at Reno this morning the METAR read OVC050. However, the clouds were at the surface, which just happens to be at 5000’ MSL. The clouds should’ve been at 5000’AGL or 10,000’ MSL.
This would also seem to indicate a possible reason that the sky conditions last night at Lugano in the sim appeared to be clear skies, yet the METAR appeared to show a low overcast layer. With an altitude of 915’ MSL, perhaps a METAR showing OVC008 would just not appear if they’re using MSL altitudes as it would be underground.
I’ve been testing this some more, and it does seem to be the issue that plagues us right now.
Just a quick note for testing this…. It is easier to test when the reported cloud bases are at least a few thousand feet above ground level. This is because their datum point on cloud bases is most likely not at the true base, to give the clouds some variety.
Yeah the winds there are just missing from the METAR. So, winds must be interpolated from n]other nearby METARS. But thanks for the report. It does seem to confirm the sim renders at MSL, rather than AGL. 3700-1200 = 2500. So, does seem to be the issue. Thanks for the confirmation report!
How thick were the clouds by chance? I think they are using some sort of reference line for cloud bases, that are not at the true base of clouds, for reasons of variety. If the clouds were very thick, it is possible that the true bases were down lower than the base reference. Such as in this picture.
Also raises the question, how did they implement wind? Wind direction from METAR and TAF are referenced to true north, tower and ATIS winds are magnetic, might also be a problem area. Did they implement magnetic variation correctly?