Agree, the problem with METAR visibility is that the observer that observe the weather can’t tell how far the fog is or how much area is covered in fog and is never stated on a METAR. Just says how much visibility at that small area the observer can see and it’s not far in low visibility. Even worse in AUTO generated METAR.
In my opinion METAR should decide what runway should be used and what type of planning the pilot should do VFR or IFR. Not created/decide the weather. It has too less details to do that. It doesn’t fit the much more detailed Meteoblue weather calculations even if it’s worse accuracy. Even when it switches from Meteoblue and METAR winds are noticable. And that is an invisible thing.
BGTL Fog predicted and stated on METAR.
Fog, what creates fog? Would be awesome if fog is stated on METAR or prediction it’s formed as it is IRL instead of just popping up out of nowhere. Why can’t they add the condition that forms fog and the fog is create by it self instead of adding the already formed fog? Would make it feel so much more realistic. I think Meteoblue does that in some kind of way but the problem is that it’s not always accurate as you say.
As you can see on this timelapse video from around release at 2020. Here only Meteoblue is in use. Not easy to blend in a METAR visibility into that if it’s not simulated the same way.
As it is now it’s just a circle of METAR Fog and the airport in the middle of that circle.