Hey Daryl,
I have to ask, did you bother to peak at the data to see what it actually
is? My hunch is model output but L products are strangely omitted from the
following table: https://www.weather.gov/tg/tablea So now I'm curious.
-Mike
On Wed, Jan 21, 2026 at 3:48 PM Herzmann, Daryl E [AGRON] <
akrherz@xxxxxxxxxxx> wrote:
> Greetings,
>
> I was reviewing my IDS|DDPLUS archival and noticed that my hourly files
> have a large variance in size.
>
> 26M 2026012104.txt
> 390M 2026012105.txt
> 27M 2026012106.txt
> ...snipped...
> 30M 2026012116.txt
> 387M 2026012117.txt
> 27M 2026012118.txt
>
> So I had a look at my LDM telemetry logging and see the the following byte
> counts for IDS|DDPLUS for the 17 UTC hour today
>
> wmo_ttaaii | sum
> ------------+------------
> SDCN01 | 1700051333
> LDUD00 | 34844596
> LDUD06 | 34771861
> LDUD12 | 34731012
> LDUE00 | 34702011
> LDUD18 | 34668540
> LDUE06 | 34664366
> LDUE12 | 34593737
> LDUH12 | 34560734
> LDUE18 | 34527322
> LDUH06 | 34485257
> LDUF06 | 34466943
> LDUF00 | 34458010
> LDUF12 | 34452545
> LDUF18 | 34412543
> LDUH00 | 34405475
> LDUG18 | 34382563
> LDUG00 | 34381983
> LDUG06 | 34376450
> LDUG12 | 34366267
> LDUH18 | 16845611
>
>
> Of course, the Canadian RADAR (SDCN01) is well known fun that I was
> already excluding from the file write, but what is LDUD00? Well, it is grib
> data:
>
> LDUD00 KWBN 211200
> GRIB^@^@^A^B...
>
> So folks may wish to update their pqact's to exclude these as well!
>
> daryl
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