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Is this the lowest and highest pressure ever in/near Europe?

Airborne_Again wrote:

How does the QNH value as such affect airspace infringements?

If you’re in a place the transition level changes (let’s say you’re under airspace with a base at FL55 and you’re at FL50), and then the next bit of airspace you encounter is defined as having a base of 5500 feet because the transition level changed. If you don’t change your altimeter from 1013 to the current QNH you’ll be about 1000 feet higher than you think you are – if you’re at FL50 and fly under airspace with a base of 5500 feet when the QNH is 1050, you’ll be making a fairly significant airspace bust.

Last Edited by alioth at 19 Jan 20:37
Andreas IOM

Yes – about 1100ft In the UK the CAA busts chief operates a (clearly illegal) policy of transponders being totally accurate so – short of an avionics engineer’s report supporting you – you need just 100ft to get busted.

Unfortunately in the winter these high pressures tend to produce non VFR conditions, in the form of a low stratus, say base 500ft and tops 1000ft, with blue skies above, so almost nobody is flying. Even IFR can be a problem because short of an ILS you can’t get back home.

EGKK 200520Z 19002KT 7000 NSC M02/M02 Q1048

EGKK 200508Z 2006/2112 24003KT 8000 NSC PROB30 TEMPO 2006/2009 0600 FZFG BKN000 BECMG 2009/2012 CAVOK BECMG 2019/2022 8000 PROB30 2022/2024 4000 BR BECMG 2100/2103 3000 BR MIFG PROB40 2100/2111 0300 FZFG BKN000 BECMG 2110/2112 9000 NSW PROB40 2111/2112 BKN005

Administrator
Shoreham EGKA, United Kingdom

Peter wrote:

If you forget to reset the altimeter when transitioning from FL to altitude.

Well, sure, but the likelihood of that causing an infringement seems to me very low compared to all other factors.

ESKC (Uppsala/Sundbro), Sweden

Peter wrote:

Unfortunately in the winter these high pressures tend to produce non VFR conditions, in the form of a low stratus, say base 500ft and tops 1000ft, with blue skies above, so almost nobody is flying.

Fantastic flying weather in the midlands. Local VFR fields are going crazy.

EGTK Oxford

We had good flying here, but just over the water in Manchester, even the airlines were struggling due to fog.

Andreas IOM

https://www.euroga.org/system/1/user_files/files/000/043/957/43957/b4d1a7175/large/image.png

Can such a graph be use to predict condensation (clouds), or is it skewed (no pun!) at altitude?

always learning
LO__, Austria

Snoopy wrote:

Can such a graph be use to predict condensation (clouds), or is it skewed (no pun!) at altitude?

Yes.

If Dew point and temperature lines touch => Cloud
If the temperature line is more oblique than the green line, unstable atmosphere. So if you heat the bottom, you might get cu or cb or sc all depending how deep the unstable portion is, how much humidity it takes with it and whether it meets a damp area

So on this picture, inversion below 1000hPa (maybe fog if ground wet and little wind) and inversion between 750 and 600 hPa with some stratus at 625hPa

Nympsfield, United Kingdom

In Cz right now and came back from a nice little flight. So when doing our pre-flight set the Dynon on 1045 and did the same on the SBY altimeter. Hey, wait a minute, that one goes to 1035 max! Don’t tell anyone, but we looked at each other and decided to risk our lives.

Check your gear folks!

Last Edited by aart at 21 Jan 12:18
Private field, Mallorca, Spain

Just on the news here. Widerøe had to cancels lots of flights due to low pressure. Some of their planes (dash 8) cannot be turned down more than 948 hPa.
https://www.nrk.no/nordland/lufttrykket-setter-nye-rekorder-over-hele-landet-1.14896554

Last Edited by LeSving at 10 Feb 18:25
The elephant is the circulation
ENVA ENOP ENMO, Norway

You mean this, with 945?

Administrator
Shoreham EGKA, United Kingdom
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