Yes exactly this, there are many ways that this can be achieved.
At the moment with the resources and programs available, I want to be able to say, right, today I am flying from London to Paris at 1600z for example, I am in a C172, it is cold and I am going VFR so I need to avoid clouds. I want to be able to go to the Meteoblue weather map on their site and look at the maps for low cloud and cloud base and check the conditions along the route at the time I will be flying in order to see if this is possible, or whether I should delay if the weather is likely to clear up, or whether I can take a slightly different route, or whether to be defeated and come back another day. I want the weather I see for the forecast for 1600z to be the weather that is in the sim at 1600z when I begin to fly.
At the moment I can look at the meteoblue forecasts, but this seems to be hardly every what is actually depicted in the sim. Sometimes it is correct, sometimes it is incorrect but I can work out that the weather in the sim is actually coming from a forecast for 12z (as an example), but most of the time it is impossible to work out and so I cannot do any flight planning. Sometimes it is just totally wrong, today in my research I found an airport that according to Meteoblue’s forecast as shown on their maps, using NEMS Global as the source, had greater than 95% low cloud coverage all day, absolutely all day, and a cloud base of 50-100m all day, absolutely all day, including in the past for as long as I could go back into the forecasts. So I load into it in the sim, clouds are broken at 5000ft… So what is happening here? How is the sim depicting this?
Now I consider live weather to be broken until I can achieve the above.
I am not particularly keen on a METAR based approach, as I find it breaks immersion as the local METAR is applied globally, with a sudden change to new weather as soon as you enter a METAR area. Nor am I overly concerned if the Meteoblue forecasts do not 100% match what actually happened/will happen in real life. It is a forecast and they often aren’t 100% accurate.
I am worried that there have been lots of reports of people not being able to get any ‘live weather’ i.e clear skies, standard pressure, 15 and degrees MSL (I think!) etc, however in my experience this only happens of you start second flight from the main menu. Yes this is a problem and needs to be sorted, but my concern is that when this is fixed (I hope it is, though I am not in anyway desperate for it, as if I do a second flight I normally continue from where I am rather than zooming across the world, and if I need to i can just restart my sim) the developers will think that the issues and bugs and main complaint with live weather is fixed. I certainly would consider it to be so, as I have outlined my principal concern above, which is to do with the flight planning aspect and accuracy of the depiction of Meteoblue’s forecasts in the sim (not necessarily the accuracy of the forecasts themselves).
Sorry for the long post, I didn’t intend it to be but I just got carried away typing, one of the many downsides of being a lawyer…
Anyway I hope this has clarified my position, and I am more than happy to help undertake any research into this area!