QNH extremes
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Was flying in the NWT (Northern Canada) in January 1989, and when we woke up one morning getting ready to go to the airport - a combination of extremely cold Arctic air mass and the oblique sun angle had produced a high pressure at the Yellowknife airport of 31.78 inHg (1076 Mb). At the same day an all time record (which still stands BTW - I just looked it up) for the North American continent was measured in Alaska of 31.84 inHg (1078 Mb). I remember that all IFR flights was canceled in Alaska as there is an FAR that grounds all aircraft when the Mercury gets above 31 inHg. I was "lucky enough to be" flying a bug smasher in VFR, and had the "pleasure" of hooking up the Herman Nelson heater to get the thing going, as the temperature was hovering below -45C. The performance at takeoff was worth it though - we literally leaped into the air and never in history has a Twin Comanche climbed to altitude quicker
Last edited by Red Jet; 23rd Jun 2010 at 07:54.
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did the avgas heater work?
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Originally Posted by aerostatic
Seen sub 980 going into NZCH a few years back.
NOIP, was it this??
Great Storm of 1987 - Wikipedia, the free encyclopedia
BBC ON THIS DAY | 16 | 1987: Hurricane winds batter southern England
Wapedia - Wiki: Great Storm of 1987
I spent that night in Essex before flying out of LHR on the 16th. Took 5 hours from Chelmsford to Heathrow. 953 was the number I remember.
Great Storm of 1987 - Wikipedia, the free encyclopedia
BBC ON THIS DAY | 16 | 1987: Hurricane winds batter southern England
Wapedia - Wiki: Great Storm of 1987
I spent that night in Essex before flying out of LHR on the 16th. Took 5 hours from Chelmsford to Heathrow. 953 was the number I remember.
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That's the one. The weather wasn't too bad when we left, but two hours later it came through and cleaned up a few things.
Afterwards we got to thinking ... What is the lowest QNH you can use on an altimeter? ..... 950
N
Afterwards we got to thinking ... What is the lowest QNH you can use on an altimeter? ..... 950
N
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Lowest QNH experienced
In the month of December 1999 a low pressure developed in the Bay of Biscay and instead of heading North East, it came Due West and did tremendous damage through central parts of France.
As it destroyed most of my roof the Pressure Barometer was reading 967.5 MB.
The noise was something to hear, like an express train going through!!.
Tmb
As it destroyed most of my roof the Pressure Barometer was reading 967.5 MB.
The noise was something to hear, like an express train going through!!.
Tmb
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Oct 1987, Bay of Biscay, flying from HMS Ship I have a note in the logbook that states QNH/QFE of 948mb. I thought that was pretty good until 1992, when in the States and affected by the edge of Hurricane Andrew and the QNH was in the 920s.
I prefer the high QNHs and time off 'cos the fish seem to bite better
I prefer the high QNHs and time off 'cos the fish seem to bite better