Hi
I wonder if someone can help. I have noticed a large difference in the pressure readings displayed in the CumulusMX gauges and the number copied into the wxnow.txt. For example right now, the reading on the gauge is 1008, which does agree with the Oregon Scientific Weather display, but the number copied into the wxnow.txt is 1017.5. Is there any reason why the two numbers should differ? The other numbers seem to be ok.
Thanks in advance.
Joe
VA3JLF
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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4019) - 03 April 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Pressure readings CumulusMX and wxnow.txt
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Re: Pressure readings CumulusMX and wxnow.txt
As noted in the wiki page about the wxnow.txt file, the pressure in wxnow.txt is altimeter pressure rather than MSLP (as that’s the way CWOP want it). Altimeter pressure is calculated from the absolute pressure from your station and your configured altitude.
Steve
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- Posts: 106
- Joined: Thu 09 Oct 2014 4:19 pm
- Weather Station: Oregon Scientific WMR200
- Operating System: Windows 10, Raspberry pi
- Location: Ontario, Canada
Re: Pressure readings CumulusMX and wxnow.txt
Thanks Steve, I knew there had to be a reason for that.steve wrote:As noted in the wiki page about the wxnow.txt file, the pressure in wxnow.txt is altimeter pressure rather than MSLP (as that’s the way CWOP want it). Altimeter pressure is calculated from the absolute pressure from your station and your configured altitude.