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Falling pressure indicates poor weather coming. Increase in pressure indicates better weather.
When flying from east to west, favourable winds will be to the south of a high or to the north of a low. Flying around a high.jpg


29.92" HG or 1013.2 millibars or 101.3kpa at 15°C. A column of air one square inch in cross-section, measured from sea level to the top of the atmosphere, would weigh approximately 14.7lbs.[1]
"From high to low, look out below." This means that flying from a high pressure system to a low pressure system, you will be at a lower altitude than your altimeter reads if you never adjusted the pressure setting. The same applies to flying from warm air to cold air.


  1. [1]Atmospheric Pressure - Wikipedia