Does MSFS2020 weather also use real world barometric pressure/QNH ?
I don’t know if I understand your question correctly but:
- atc gives you the qnh of the airport
- atc gives you the current atc in flight following mode
- you can recalibrate qnh ant time with the ‘b’-key.
These qnh values are pulled live from somewhere (Meteoblue?).
Hope this helps.
Thanks for that. Just to clarify, I fly online with Vatsim, not MSFS2020 multiplayer. I know how to set QNH usually from an ATIS but also from a real world Metar source. I do use MSFS2020 real world weather which produces similar clouds, winds etc as in real life. So my query is, does this real world weather setting also reproduce the real QNH?
As a VATSIM user myself I can tell you it does however it’s rather spotty, there is joke where if you’re going to tell a pilot that you know is in MSFS the altimeter setting it’s best to just tell them to press B.
I don’t know the actual source of in-SIM METAR live weather data, but since SU7 it always accords exactly with IRL metar which includes the altimeter/QNH value. ( So not like pre SU7 Meteoblue, which always seemed to be different leading to different pressure and wind)
I know now that if I use a real world METAR source and use that to set QNH, then it is very likely going to match what I would get by pressing B or from a Vatsim or SIM ATIS source as they all derive ultimately from IRL metar. You do see some very small variations, but nothing more than the odd hectopascal.
And before anyone says anything, I’m not commenting on the accuracy of how that metar data on clouds and precip is then rendered by the SIM weather engine! That’s a separate issue
This is a good source:
That’s where I usually get my QNH from. So is “B” just setting to STD or 1013 (29.91) or does “B” pick up the barometric pressure from the nearest Metar station (noting that in some cases due to distance away the metar at arrival airfield is often quite different than the said station) ?
Yes. Via METAR, hence real world weather. There are a few bugs, however. May not be 100% accurate all of the time.
If above transition altitude, which is set globally to 18000’ in MSFS, ‘b’ will set standard 1013/29.92. Below transition level (FL180) then yes, local metar pressure will be set. There is no equivalent of ‘regional QNH’ used IRL by ATC to cover a wider area.
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