PPRuNe Forums - View Single Post - why always high Qnh in mountain airports?
Old 8th February 2002 | 04:01
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HugMonster
 
Joined: Sep 1999
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No.

Increasing the altimeter setting increases the altitude shown.

Think about it - you land one evening at relatively low pressure. Overnight the air pressure increases. You come back to it and find that the altimeter, seeing higher pressure, thinks you've descended, so shows lower altitude.

You adjust to the higher pressure, and the altimeter winds back up.
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