It is likely that I am mis-using the terms altimeter, barometer, and pressure. I'll clarify what I mean here.
What I previously defined as 'correct' pressure is that the pressure reported by my station (LaCrosse WS-2813U-IT) matches the National Weather Service barometer reading ( https://forecast.weather.gov/MapClick.php?lat=47.715130000000045&lon=-116.94667999999996#.XkdkXDFKiUk). For example, *right now* my station is reading 30.06 pressure and the NWS site is reporting 30.0 barometer. Ultimately I just want my WS-2813 pressure reading to match the WU pressure reading ( https://www.wunderground.com/dashboard/pws/KIDPOSTF43). Right now it appears that WU is reading the weewx barometer reading. Is there a way to have weewx report the pressure reading to WU? My WS-2813 outputs the manually adjusted pressure in the Loop records (see attachment). I don't see a way to change that. Here is a link to the manual ( https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf ). On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote: > > I would expect you to be reporting barometer = sea level pressure which is > pressure adjusted for temperature and altitude because weather stations > always report sea level pressures. > > Is what you call 'correct' pressure the raw pressure of the instrument or > a pressure which you have set. Does the station output the raw pressure or > the manually adjusted pressure in the loop records? > > > > On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote: >> >> Andrew, that's a good questions; let me clarify. >> >> This issue started when Weather Underground (WU) stopped showing my >> station on the maps. I found out that was because I was reporting an >> incorrect barometric 'pressure.' As I dug into the details I found that my >> *station >> *was displaying the correct pressure (29.xx) but by the time it got to >> WU, it was displaying the barometer reading (32.xx) from weewx. This can >> also be demonstrated by looking at the data displayed at >> /var/www/html/weewx/index.html >> (see attachment) so I assume that weewx is taking the pressure from my >> station and somehow converting it or exchanging it for barometric pressure >> before it gets uploaded to WU. I just want the pressure from my unit to be >> what is reported to WU. >> >> Side note: I've been running this station for many years on a Windows >> based system and it has been working fine. So I know the hardware side is >> working; just something different about how weewx reports pressure (or >> barometer, or altimiter). >> >> Does that help clarify my issue? >> >> On Friday, February 14, 2020 at 2:24:31 AM UTC-8, Andrew Milner wrote: >>> >>> I am not sure I understand what you think is wrong with the readings of >>> Pressure 29.89 >>> Barometer 32.609 >>> Altimeter 32.40 >>> and why you believe something is wrong >>> >>> >>> On Friday, 14 February 2020 05:57:36 UTC+2, Dan Blanchard wrote: >>>> >>>> Altitude is 2,320 ft. and the values are in the screen shot on the >>>> previous post. Did you see that? >>>> >>>> On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote: >>>>> >>>>> I give up - looks correct to me. >>>>> >>>>> have you run from the command line and seen the LOOP and REC data >>>>> weewx is receiving? >>>>> >>>>> what altitude is your station, and what values are you currently >>>>> getting for pressure, barometer and altimeter? >>>>> >>>>> On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote: >>>>>> >>>>>> I don't know, but that makes sense so I did it. I'm still not >>>>>> getting desired results though. >>>>>> >>>>>> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote: >>>>>>> >>>>>>> Do you need a space between your minus sign and the adjustment >>>>>>> value? >>>>>>> >>>>>>> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard <dan.z...@gmail.com> >>>>>>> wrote: >>>>>>> >>>>>>>> Hey Andrew, will you please look at the attached screen shots and >>>>>>>> let me know if this looks correct? >>>>>>>> >>>>>>>> Do I need to restart (sudo /etc/init.d/weewx restart) after I make >>>>>>>> these changes? I have and the changes don't seem to be taking effect. >>>>>>>> Is >>>>>>>> there something else I need to do? >>>>>>>> >>>>>>>> With regard to the barometer and altimeter having the same >>>>>>>> settings; I have probably misled. They are not exactly the same but >>>>>>>> they >>>>>>>> were relatively close to each other compared to the pressure value. >>>>>>>> Here >>>>>>>> are the current readings as of now when I run sudo weewxd >>>>>>>> /etc/weewx/weewx.conf. >>>>>>>> >>>>>>>> pressure: 29.98 >>>>>>>> altimeter: 32.57 >>>>>>>> barometer: 32.74 >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner >>>>>>>> wrote: >>>>>>>>> >>>>>>>>> If you have a LaCrosse WS28xx station then according to the >>>>>>>>> hardware guide the station outputs PRESSURE in weewx terminology - >>>>>>>>> regardless of what LaCrosse call it - and weewx should calculate >>>>>>>>> barometer >>>>>>>>> and altimeter settings. >>>>>>>>> >>>>>>>>> If pressure is incorrect then it can be adjusted as you specified >>>>>>>>> - by adjusting pressure (not barometer or altimeter) >>>>>>>>> >>>>>>>>> Make sure pressure is set to use hardware and barometer and >>>>>>>>> altimeter are set to use software. >>>>>>>>> >>>>>>>>> I am surprised barometer and altimeter are the same values - have >>>>>>>>> you set the station's altitude in weewx.conf, and have you specified >>>>>>>>> software generation for the values? >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote: >>>>>>>>>> >>>>>>>>>> Andrew, are you suggesting that I make a 'correction' entry under >>>>>>>>>> [StdCalibrate] such as barometer = barometer -2.8 assuming that I >>>>>>>>>> am >>>>>>>>>> getting a pressure reading of 30.13 and Barometer and ALtitude >>>>>>>>>> readings of >>>>>>>>>> 32.93? >>>>>>>>>> >>>>>>>>>> (see attached screenshot) >>>>>>>>>> >>>>>>>>>> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew >>>>>>>>>> Milner wrote: >>>>>>>>>>> >>>>>>>>>>> 1. use stdcalibrate section of weewx.conf >>>>>>>>>>> http://weewx.com/docs/usersguide.htm#StdCalibrate >>>>>>>>>>> 2. FO station = Fine Offset weather station >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard >>>>>>>>>>> wrote: >>>>>>>>>>>> >>>>>>>>>>>> Andrew, how do I calibrate the pressure in weewx? Also, what's >>>>>>>>>>>> a FO station? >>>>>>>>>>>> >>>>>>>>>>>> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew >>>>>>>>>>>> Milner wrote: >>>>>>>>>>>>> >>>>>>>>>>>>> check that the absolute pressure is correct - I have had a FO >>>>>>>>>>>>> station which had a dodgy pressure sensor before now. >>>>>>>>>>>>> Calibrating pressure >>>>>>>>>>>>> in weewx solved it. >>>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>> 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...@googlegroups.com. >>>>>>>> To view this discussion on the web visit >>>>>>>> https://groups.google.com/d/msgid/weewx-user/08c79655-b1af-4134-9a2b-82a4f52f051f%40googlegroups.com >>>>>>>> >>>>>>>> <https://groups.google.com/d/msgid/weewx-user/08c79655-b1af-4134-9a2b-82a4f52f051f%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>> . >>>>>>>> >>>>>>> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. 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