Hi Nico.

I have had a QNH issue for a long time, especially in MMMX. In this case the real METAR at this hour zulu, shown in the image, is 30.32, and PSXT is working with 29.79, a big differential that makes aircraft to land a mile before the runway.

I tested with RT App and RT Direct; in both cases, they are the same. The image shown is with RealTraffic and RT App to see the METAR feed.

Thank you for your support.
Jaime Cuellar
Monterrey, Mexico
https://drive.google.com/file/d/1yZmFxUFJ_HhczFpU85pZjmSBI-u9pBBD/view?usp=sharing

Hi Jaime,

I have no acces to your google drive ...

Nico

18 hours ago, kiek said:

Hi Jaime,

I have no acces to your google drive ...

Nico

Hi, Nico.

I just give you access.

Jaime

Thx,

3 hours ago, jcuellar said:

I just give you access.

I've send it to Balthasar.
Nico

There was an error in the reported METAR.
I'll make PSXT more defensive, to overcome these situations.

7 hours ago, kiek said:

There was an error in the reported METAR.
I'll make PSXT more defensive, to overcome these situations.

Thx, Nico.

I was thinking about an option to put manually the correct QNH, this will be very helpful when we are just plane spotting and the baro is not changing on the fly.

Jaime
Monterrey, Mexico

On 8/20/2026 at 8:27 PM, jcuellar said:

I was thinking about an option to put manually the correct QNH, this will be very helpful when we are just plane spotting and the baro is not changing on the fly.

I've checked at MMMX and did not see a difference with the official reported METAR. So what you have experienced is something that was extraordinary. I assume it does not happen very often, so not really a candidate for another option, I'm afraid.