I'm trying to sort out barometer and pressure values. I own HP1001 clone.
Internal T/H/P sensor was calibrated with my friends certified barometer
before. Currently it sensor shows absolute pressure value 936,7 hPa and it
almost perfectly (+/- 1 hPa) aligns with very accurate numerical forecast
for my location. Same meteogram show also relative pressure 1007 (+/- 1
hPa) for my location. METAR for nearby (43 km) airport shows 1008 hPa.
Relative pressure displayed by my HP1001 is about 20 hPa higher than
absolute - obviously too low value because I'm located about 550 m AMSL.
When calculated by Weewx itself ("software" option enabled in weewx.conf),
my weather station shows 1001 hPa - still too low. Of course I checked
location setting and AMSL value and unit - in my opinion they are properly
set. Should I change something in weather station settings? I can set only
coordinates, not the AMSL height.
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