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Barometric pressure jumps every day at 6 a.m.

Discussion specific to Fine Offset and similar rebadged weather stations
wmayfield
Posts: 29
Joined: Thu Aug 05, 2010 5:41 pm
Weather Station: Ambient Weather WS-2080
Operating System: Windows XP SP2

Barometric pressure jumps every day at 6 a.m.

Postby wmayfield » Fri Jan 18, 2013 12:13 pm

My barometric pressure readings go through a cycle every day that I am pretty sure is not really happening. Every day just before 0600 the barometric pressure reading starts rising sharply and goes up 12-15 mb in an hour. Then it spends the next 23 hours gradually going down until it shoots up again the next day.

The pressure readings at nearby NWS stations and personal weather stations do have a diurnal cycle, but it's not the same. They have more of a sine wave looking pattern with a gradual high around late morning and a gradual low in late afternoon.

Has anybody else seen this or have a theory why it would be happening? I'm not sure if it's happening in the software or in my weather station.

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steve
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Re: Barometric pressure jumps every day at 6 a.m.

Postby steve » Fri Jan 18, 2013 12:31 pm

A number of cases have been reported on this forum of the Fine Offset pressure tracking the inside temperature; your issue sounds similar.
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Please read the posts in the Announcements section about the current status of Cumulus development now that I have retired

wmayfield
Posts: 29
Joined: Thu Aug 05, 2010 5:41 pm
Weather Station: Ambient Weather WS-2080
Operating System: Windows XP SP2

Re: Barometric pressure jumps every day at 6 a.m.

Postby wmayfield » Fri Jan 18, 2013 7:31 pm

Just for grins I moved the base unit a little farther away from the window and put a shoebox over it to try to shield it from any environmental factors. We'll see tomorrow morning if it makes any difference.

AllyCat
Posts: 997
Joined: Sat Feb 26, 2011 1:58 pm
Weather Station: Fine Offset 1080/1 & 3080
Operating System: Windows XP SP3
Location: SE London

Re: Barometric pressure jumps every day at 6 a.m.

Postby AllyCat » Sun Jan 27, 2013 5:44 pm

wmayfield wrote:We'll see tomorrow morning if it makes any difference.
Did it?

Werris Creek
Posts: 6
Joined: Fri Oct 16, 2015 6:50 am
Weather Station: PanTech (Fine Offset) WH3081
Operating System: Windows XP Pro SP3
Location: Gundagai, NSW, Australia
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Re: Barometric pressure jumps every day at 6 a.m.

Postby Werris Creek » Wed Aug 23, 2017 1:34 am

During a period of little actual change in pressure, I've caught my WH3081 (rebadged as "PanTech") showing the temperature dependence of its pressure sensor with inside temperature. It goes through this cycle every day as the reverse cycle air conditioner kicks in and stops for a short time as its outside unit temporarily freezes up.
press-temp.png

It looks like there's a close to +0.36 hPa/°C pressure reading variation. I expect that Steve has very little available time, but it would be great if he could add the option of a -0.36 hPa/°C compensation option for FO weather stations to the calibration page which would mostly null out this annoying error.
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