Dewpoint errors in Op40 analysis

[jstndlee]

Hello,

I was taking a look at an Op40 analysis and noticed extremely high dewpoints. I was wondering what causes this and how to interpret it.
I typically feed these data into another program as well, is there any value I could replace these with, or should these simply be treated as errors? For example, I could just linearly interpolate those values, but I am worried that would ruin the validity of the analysis.

https://rucsoundings.noaa.gov/get_soundings.cgi?data_source=Op40&start_year=2023&start_month_name=Jan&start_mday=30&start_hour=18&start_min=0&n_hrs=1.0&fcst_len=shortest&airport=ntd&text=Ascii%20text%20%28GSL%20format%29&hydrometeors=false&startSecs=1675101600&endSecs=1675105200

Very respectfully,
Justin Lee

Edit: the analysis has expired so I attached a copy I made at the time.
error example.txt

[Brian-Jamison]

Hi Justin,

I looked at this sounding, and the unusually high values for dewpoint would seem to indicate that some missing data (probably set to 999999) is not being handled correctly and erroneously being interpolated. This is very unusual for model data, and hopefully it's just an anomaly, but if you start seeing it more often, please let us know.
You should treat these levels as missing data in your program.

Thanks,

Brian Jamison

[jstndlee]

Hello @Brian-Jamison,

Following up on this topic a bit, dewpoint errors have been rare enough to not cause any real problems but today there was a particularly bad few hours for this area. I'm posting to hopefully give anyone who might try to look into these errors some more data points.

2023_(09)Sep_12_1900z Op40 NTD.(00hr).txt
2023_(09)Sep_12_1900z Op40 NSI.(00hr).txt
2023_(09)Sep_12_1800z Op40 NTD.(00hr).txt
2023_(09)Sep_12_1800z Op40 NSI.(00hr).txt
2023_(09)Sep_12_1700z Op40 NTD.(00hr).txt
2023_(09)Sep_12_1700z Op40 NSI.(00hr).txt

Very respectfully,
Justin Lee

[Brian-Jamison]

Hi Justin, Thanks for sharing these. I'll try to take a closer look when I can get a chance. Brian

…

On Tue, Sep 12, 2023 at 3:11 PM jstndlee ***@***.***> wrote: Hello @Brian-Jamison <https://github.com/Brian-Jamison>, Following up on this topic a bit, dewpoint errors have been rare enough to not cause any real problems but today there was a particularly bad few hours for this area. I'm posting to hopefully give anyone who might try to look into these errors some more data points. 2023_(09)Sep_12_1900z Op40 NTD.(00hr).txt <https://github.com/NOAA-GSL/GSL-Regional-Model-Forum/files/12590897/2023_.09.Sep_12_1900z.Op40.NTD.00hr.txt> 2023_(09)Sep_12_1900z Op40 NSI.(00hr).txt <https://github.com/NOAA-GSL/GSL-Regional-Model-Forum/files/12590898/2023_.09.Sep_12_1900z.Op40.NSI.00hr.txt> 2023_(09)Sep_12_1800z Op40 NTD.(00hr).txt <https://github.com/NOAA-GSL/GSL-Regional-Model-Forum/files/12590900/2023_.09.Sep_12_1800z.Op40.NTD.00hr.txt> 2023_(09)Sep_12_1800z Op40 NSI.(00hr).txt <https://github.com/NOAA-GSL/GSL-Regional-Model-Forum/files/12590901/2023_.09.Sep_12_1800z.Op40.NSI.00hr.txt> 2023_(09)Sep_12_1700z Op40 NTD.(00hr).txt <https://github.com/NOAA-GSL/GSL-Regional-Model-Forum/files/12590899/2023_.09.Sep_12_1700z.Op40.NTD.00hr.txt> 2023_(09)Sep_12_1700z Op40 NSI.(00hr).txt <https://github.com/NOAA-GSL/GSL-Regional-Model-Forum/files/12590902/2023_.09.Sep_12_1700z.Op40.NSI.00hr.txt> Very respectfully, Justin Lee — Reply to this email directly, view it on GitHub <#36 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AN6GSUSSRINBBUNKUKT4JXTX2DFWHANCNFSM6AAAAAAULRASIU> . You are receiving this because you were mentioned.Message ID: <NOAA-GSL/GSL-Regional-Model-Forum/repo-discussions/36/comments/6983288@ github.com>