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 QNH Same as altimeter setting. 
QPF Quantitative Precipitation Forecast.
Quadrant electrometer A very sensitive electrostatic electrometer for measuring small potential differences.
Quasi-geostrophic approximation An approximation to the complete equations describing atmospheric motion in which only the terms most important for the growth and decay of synoptic scale extratropical weather systems (i.e., the large areas of high and low pressure seen on weather maps) are retained.
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