There are two sea level pressures. One is QNH (Altimeter setting) and the other is MSLP.
Although WeeWX calculates both sea level pressures, the one that is displayed on the default Seasons skin is MSLP.(Mean Sea Level Pressure). WeeWX displays MSLP as "Barometer". MSLP is indeed, calculated from your station pressure. and converts your station pressure to an equivalent pressure at sea level. Therefore at 360 m elevation and station pressure of 1020, WeeWX appears to be calculating MSLP correctly of about 1064 hPa.(depending on outside temperatures). However, a MSLP = 1064 sounds like an unrealistically high pressure . In reading your weather station manual, it lloks like you can manually set your relative pressure to a calibrated pressure source like a close-by airport < 25 km. . If your current relative pressure does not match QNH or Altimeter setting, then your station pressure could be inaccurate. If it is out, set your relative pressure to be the same as the airport Altimeter setting or QNH then subtract the offset of 45 hPa (44.7) to calculate your station pressure (QFE).Unfortunately, I did not find the procedure to adjust your station pressure in the manual. You will have to check the accuracy of your barometer and re-calibrate if necessary. I would recommend that you refer to the barometer wiki for more specific guidance regarding calibration. Although the wiki is intended for Ecowitt weather stations, the same principles apply to all weather stations. Go to www.barometer-wiki.ca/barometer and see the Archive section for "fixed offset" weather stations.. Good luck and let us know how it goes... On Thursday, April 10, 2025 at 5:40:10 AM UTC-4 Alex Z99 wrote: > I deploy the weewx version 5.1.0 an station ist WS2816 (Technoline). > Altitude is 360 m above sealevel. It is defined in the section [Station] > in weewx.conf, but the difference between station value and displayed value > at index.html of weewx is about 45 mBar. > For example: The pressure value from station is 1020 mBar, This value is > also transfered via mqtt to my broker, but at the index page with version: > Seasons 5.0.2 > it appears 1064 mBar which seem to be the pressure at sealevel. > I tried to fix that issue with correction in the section [StdCalibrate], > but that did not work. > It seem that weewx displays the calculated barometer value from the real > pressure value from station. > I have no idea how to fix that issue, any idea? > > br > > Alex > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/weewx-user/bde2c098-3c45-4de3-84eb-0800181f0f0fn%40googlegroups.com.
