Hi Pete,
I think you're onto it, I'm seeing similar symptoms/impacts out of COD.
I'm inclined to call this a bug, I doubt this is intentional and it goes
against what we're used to. I'm going to write the folks listed on that
SCN and see if we can get some insight into this. Will report back with
what I hear.
Best,
-Mike
On Mon, Jan 27, 2025 at 4:47 PM Pete Pokrandt <poker@xxxxxxxxxxxx> wrote:
> All,
>
> I just noticed a curiosity about the new SAUS99 METAR format that I'm not
> immediately sure how to deal with. I am getting the SAUS99 and SPUS99
> reports, but the time on the WMO header is different, and that's messing up
> my data filing in the LDM.
>
> To save data for the old Pete Neilley weather program (yes, I do still use
> that..) I use the following
>
> DDS|IDS ^S[AP].* .... ([0-3][0-9])([0-2][0-9]) FILE
> /usr/local/ldm/data/weather/(\1:yy)(\1:mm)\1\2.METAR
>
> Note that it is using the DDMM in the WMO product header (the
> ([0-3][0-9])([0-2][0-9]) part ) to determine the day/hour of the file to
> put it in.
>
> As we all know, the METAR times are a bit before the actual hour they are
> valid for (e.g. the METAR with a time of 1253 is actually the 13 UTC ob,
> and should be put in the 13 UTC file.
>
> With the old format (SAUS70/80/90) the time on the WMO header actually was
> the correct time (1300) for the 1253 ob.
>
> SAUS80 KWBC 271300 RRB^M^M
> METAR^M^M
>
> KMSN 271253Z 23007KT 200V270 10SM FEW180 FEW250 M07/M14 A2991 RMK^M^M
> AO2 SLP141 T10721144 $=^M^M
>
>
> However, with the new format (SAUS99) the time on the WMO is generally
> earlier, so in the example here, the 1753 Ob (which should be in the 18 UTC
> file) ends up in the 17 UTC file.
>
> SAUS99 KWBC 271756 RRH^M^M
> METAR^M^M
>
> KMSN 271753Z 25011G23KT 10SM BKN160 BKN250 04/M12 A2973 RMK AO2^M^M
> SLP077 T00391122 10044 21072 58033=^M^M
>
> I think I found a workaround for my purposes, but wanted to put it out
> there in case it's affecting anyone else..
>
> Pete
>
>
>
> Pete Pokrandt - System Engineer IV
> UW-Madison Dept of Atmospheric and Oceanic Sciences
> 608-262-3086 - poker@xxxxxxxxxxxx
> ------------------------------
> *From:* ldm-users <ldm-users-bounces@xxxxxxxxxxxxxxxx> on behalf of
> Herzmann, Daryl E [AGRON] <akrherz@xxxxxxxxxxx>
> *Sent:* Monday, January 27, 2025 11:27 AM
> *To:* ldm-users@xxxxxxxxxxxxxxxx <ldm-users@xxxxxxxxxxxxxxxx>
> *Subject:* [ldm-users] The S[AP]US99 update for METARs just happened
>
> Howdy,
>
> A reminder that this change just happened.
>
> The NWS National Centers for Environmental Prediction (NCEP) Central
> Operations (NCO) creates routine collectives of observational METAR data
> in SAUS70 KWBC, SAUS80 KWBC, SAUS90 KWBC and their counterparts for
> Special observations SPUS70, SPUS80 and SPUS90. These collectives
> require manual intervention to add METAR stations to them. These are
> then distributed over the SBN. Another product, SAUS99 KWBC, and the
> Special observation counterpart SPUS99 KWBC contain any METAR observation
> received every minute. Delivering SAUS99 and SPUS99 over the SBN rather
> than the aforementioned collectives will provide more observational data
> and more timely data to users of the SBN.
>
> The replacement with SAUS99 and SPUS99 is expected to occur on or about
> 1200 Coordinated Universal Time (UTC), January 27, 2025. If a Critical
> Weather Day has been issued, this change will be postponed until 1200 UTC
> on the next non-Critical Weather Day.
>
>
> https://urldefense.com/v3/__https://www.weather.gov/media/notification/pdf_2023_24/scn24-99_add_saus99_to_sbn_aaa.pdf__;!!Mak6IKo!K44CJVSMFQBBR4h9RLswmLpN1JShZZJLM-zvWlrCQT26pq7B-6JV6h9ZIAqtSvktkgbOL-pBQRZTgA9LCC8p$
>
> So far, I have observed 265 SAUS99 products and 114 SPUS99 products cross
> the IDD since about 15 Z
>
> daryl
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--
- Mike Zuranski
