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Altimeter 30.55  
User currently offlineGoboeing From United States of America, joined Jun 2000, 2816 posts, RR: 14
Posted (14 years 4 months 5 days 2 hours ago) and read 1391 times:

...and that's what this post is about. I was listening to my scanner on LGA approach yesterday and today and I heard the planes getting the altimeter for the approach. The altimeter setting was at hightest 30.55". Isn't that high? I've never even heard it past about 30.25 or so, and I thought for a minute that it was a squawk or something when the pilots were saying "three zero five five, roger".
Does anyone here know the extremes for the barometer that have been documented?


12 replies: All unread, jump to last
User currently offlineTimz From United States of America, joined Sep 1999, 7130 posts, RR: 7
Reply 1, posted (14 years 4 months 5 days ago) and read 1319 times:

Didn't it creep above 31 in Alaska a few winters back? Did that cause some? many? most? aircraft to be grounded until it dropped?

User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4297 posts, RR: 35
Reply 2, posted (14 years 4 months 5 days ago) and read 1291 times:

A NOTAM will be issued if it drops below 28.00 and 32.00.. im quite sure those are the limits.

Chicks dig winglets.
User currently offlineL-188 From United States of America, joined Jul 1999, 30262 posts, RR: 57
Reply 3, posted (14 years 4 months 4 days 20 hours ago) and read 1260 times:

That isn't an uncommon reading in the middle of winter. Especially if it is really really really cold out. Say when it is -30 or -40 out.

User currently offlineEGNV From United Kingdom, joined May 2001, 171 posts, RR: 0
Reply 4, posted (14 years 4 months 4 days 7 hours ago) and read 1221 times:

Does anyone know what that is in european measurements?

I know that 29.92 is 1013...

That is a very high pressure reading. Is that the QNH?

User currently offlineChdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 5, posted (14 years 4 months 3 days 23 hours ago) and read 1185 times:

30.55 is 1034mb
It was a strange setting for this time of year in the US northeast, especially when it was around 29.88 (1012mb) 2 days prior.

No, QNH is 18,000 msl in the US. (Mt. McKinley in Alaska I believe).


"Never trust a clean Crew Chief"
User currently offlineDufo From Slovenia, joined May 1999, 836 posts, RR: 3
Reply 6, posted (14 years 4 months 3 days 17 hours ago) and read 1175 times:

No wonder that we have FL035 and such stuff in Europe  Smile .. plus 'backtrack'!


I seriously think I just creamed my pants without any influence from any outside variables.
User currently offlineSkihigh2002 From United States of America, joined Jun 2000, 315 posts, RR: 0
Reply 7, posted (14 years 4 months 3 days 10 hours ago) and read 1166 times:

What does QNH stand for?


User currently offlineUSAFHummer From United States of America, joined May 2000, 10685 posts, RR: 51
Reply 8, posted (14 years 4 months 1 day 7 hours ago) and read 1126 times:

Mount McKinley (Denali) is 20,320 feet high, not 18,000...you may have been thinking of Mount St. Elias, which is 18,008 feet high, in Alaska...

What is QNH????


Chief A.net college football stadium self-pic guru
User currently offlineAirplay From , joined Dec 1969, posts, RR:
Reply 9, posted (14 years 4 months 1 day 6 hours ago) and read 1126 times:

QNH is notation describing the altitude above sea level as opposed to QFE which is the altitude above the ground at the reporting station.

It has nothing to do with Mountains. 18,000 ASL is the transition altitude to standard altimeter setting in North America. Aircraft set the altimeter to 29.92 above this altitude. The transition altitude is different in other parts of the world.

User currently offlineAirplay From , joined Dec 1969, posts, RR:
Reply 10, posted (14 years 4 months 1 day 6 hours ago) and read 1120 times:


QFE=Question Field Elevation
QNH=Question Nill Height
QNE=Question Nill Elevation

QNE represents the transition altitude

User currently offlineSQ325 From Germany, joined Jul 2001, 1469 posts, RR: 7
Reply 11, posted (14 years 3 months 3 weeks 1 day 16 hours ago) and read 1064 times:

QNH 1013 is a part of the ISA standard atmosphere.

User currently offlineTs-ior From Tunisia, joined Oct 2001, 3726 posts, RR: 5
Reply 12, posted (14 years 3 months 2 weeks 6 days 15 hours ago) and read 1028 times:


Notice that the highest QNH was registered in the
North Pole...it was 1080mbs...unbelievable,but true!!!

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