Hi Nico,

I'm doing some plane spotting at Mexico City MMMX, RealTraffic is showing the correct METAR with a QNH 30.48, but PSXT is showing 1017 instead of 1032. That makes approaching traffic land before the runway. When QNH matches correctly, traffic lands on the correct runway spot. 

Thx.

Jaime. Monterrey, Mexico

14 hours ago, jcuellar said:

I'm doing some plane spotting at Mexico City MMMX, RealTraffic is showing the correct METAR with a QNH 30.48, but PSXT is showing 1017 instead of 1032.

Hi Jaime,

RealTraffic does not work with PSXT ... Do you mean PSXTraffic?

Hi,

This is the scenario: I run just PSXT as usual without RealTraffic. It started with the correct QNH according to the METAR; after a few minutes, around 10, PSXT changed the QNH to 1017 and there was no change on the real METAR. I supposed it was an issue from RealTraffic, so a exit PSXT and open RealTraffic in Spotter mode, METAR was correct at 30.48 in. So there was no error with RealTraffic. I exited RT and opened PSXT and started with 1017. 

You cannot look at the Realtraffic app to compare your QNH in PSXT with. PSXT does not get his QNH from the RT app, but from the RT API ... So you cannot conclude that RT had the right QNH.

Most likely it was a problem in the RT API. Did you check the Log for QNH reading problems?

I've just visited MMMX (with PSXT) and the QNH matched the one published here:

METAR, TAF and NOTAM decoder for all 68,188 airports (metar-taf.com)

Edited October 16, 20241 yr by kiek

I have not seen any issues with QNH in PSXT v8.5.1; the QNH in PSXT matches the METAR at the airports I have visited.

10 hours ago, kiek said:

You cannot look at the Realtraffic app to compare your QNH in PSXT with. PSXT does not get his QNH from the RT app, but from the RT API ... So you cannot conclude that RT had the right QNH.

Most likely it was a problem in the RT API. Did you check the Log for QNH reading problems?

I've just visited MMMX (with PSXT) and the QNH matched the one published here:

METAR, TAF and NOTAM decoder for all 68,188 airports (metar-taf.com)

I tested once more today; the first image was at 8:38 am (1438z), the second one changed QNH to 1013 at 9:12 am (1512z) in PSXT, but QNH remains the same. 

https://ibb.co/KFWkkGm

https://ibb.co/56gvKK1

Edited October 16, 20241 yr by jcuellar
Missing info.

2 hours ago, jcuellar said:

 the second one changed QNH to 1013

PSXT shows 1013 (the STD QNH) if no QNH is coming from RT..  It looks as if  there was a problem with RT weather. Does the Log file not show any messages about that?

On 10/16/2024 at 11:41 AM, kiek said:

PSXT shows 1013 (the STD QNH) if no QNH is coming from RT..  It looks as if  there was a problem with RT weather. Does the Log file not show any messages about that?

I'll test today once more to have a new log file.