Glossary
Aviation Weather
QNH (QNH)
Definition
The atmospheric pressure adjusted to mean sea level, used for altimeter setting
Related Terms
Airport Elevation (ELEV)
The highest point of an airport's usable landing area measured above mean sea level
Flight Level (FL)
A standard altitude reference based on a fixed pressure setting of 29.92 inHg (1013.25 hPa)
METAR (METAR)
Aviation Routine Weather Report — a standardized format for reporting current weather conditions
Transition Altitude (TA)
The altitude at which aircraft change from local altimeter settings to standard pressure