CWOP (MADIS) reporting dew point errors

[William Phelps]

Starting on January 23, I have been getting daily reports showing huge errors in Dew Point from CWOP.  As near as I can tell the data is consistent with what was reported before this date and is correct.  I checked the reported Dew Point calculation using the reported temperature and relative humidity for the given readings and they are as expected.  In looking at my email logs I notice there was no "weather data quality report" email on January 22; all prior to that are reasonable, and all after show large errors in DewPt...

Has anyone else seen this?

Here's a sample from the email I got on Jan 23:

[Thomas Keffer]

Hello, William

What version of weewx? 

If you run it directly from the command line, what values of dewpoint does it print out?

Did you change anything around 23 January?

-tk

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[William Phelps]

Hello Thomas,

I haven't updated weewx or made any changes in over a year; it just keeps on ticking away.  I can check what version it is if you think that's relevant.

To me the Dew Point data looks correct.  I don't see a significant change in the data from one day to the next.  As I understand it weewx reports only temperature and RH to CWOP and CWOP calculates DewPt, at least that's what I read in my searches.  it looks to me like CWOP (or MADIS) is in error in this case, and I was wondering if anyone else was seeing the same problem.  There was a similar report from another station a while back but I don't know what they did to fix it.

William

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[ZigmundRat]

FWIW, at CWOP station AS817 I am not seeing the same. I have numerous errors from the last couple of days, dew point being the largest. I think this is due to my outdoor sensor now being under the snow :O 

On Sunday, February 12, 2017 at 12:02:59 AM UTC-5, William Phelps wrote:

Hello Thomas,

I haven't updated weewx or made any changes in over a year; it just keeps on ticking away.  I can check what version it is if you think that's relevant.

To me the Dew Point data looks correct.  I don't see a significant change in the data from one day to the next.  As I understand it weewx reports only temperature and RH to CWOP and CWOP calculates DewPt, at least that's what I read in my searches.  it looks to me like CWOP (or MADIS) is in error in this case, and I was wondering if anyone else was seeing the same problem.  There was a similar report from another station a while back but I don't know what they did to fix it.

William

On Sat, Feb 11, 2017 at 2:50 PM, Thomas Keffer <tke...@gmail.com> wrote:

Hello, William

What version of weewx? 

If you run it directly from the command line, what values of dewpoint does it print out?

Did you change anything around 23 January?

-tk

On Sat, Feb 11, 2017 at 10:59 AM, William Phelps <wbph...@gmail.com> wrote:

Starting on January 23, I have been getting daily reports showing huge errors in Dew Point from CWOP.  As near as I can tell the data is consistent with what was reported before this date and is correct.  I checked the reported Dew Point calculation using the reported temperature and relative humidity for the given readings and they are as expected.  In looking at my email logs I notice there was no "weather data quality report" email on January 22; all prior to that are reasonable, and all after show large errors in DewPt...

Has anyone else seen this?

Here's a sample from the email I got on Jan 23:

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