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Pressure Measurement: Difference between revisions
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On the other hand, most airport sites only give pressure to the nearest hPa, so you can be 0.5 hPa out if you use that, whereas most personal weather stations give pressure with 0.1 hPa precision.
The best time to set your datum is when the pressure is steady; in other words when Trend shown at the bottom left in the Cumulus display is zero hPa/h.
To figure out what to put into the Cumulus box, use the following equation, where <math>P_c</math> is the pressure on your console and <math>P_s</math> is the pressure from a nearby station:
<math>Correction = P_s - P_c</math>
==Locating the Barometer==
==How Accurate are PWS Barometers?==
The figure below shows a comparison between the pressure measured by a Fine Offset PWS and a nearby AWS. You can see that the comparison is excellent.
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