[ldm-users] NDFD ldm product ID changes on CONDUIT

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• Subject: [ldm-users] NDFD ldm product ID changes on CONDUIT
• From: "Herzmann, Daryl E [AGRON]" <akrherz@xxxxxxxxxxx>
• Date: Thu, 1 Nov 2018 14:11:15 +0000
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Hi All,

If you process the NDFD data provided by CONDUIT, you may wish to double 
check that your processing is still correct.  On Tuesday, the NWS 
implemented a change to the Grib2 encoding parameters of some of the NDFD 
grids.

https://www.weather.gov/media/notification/pdfs/scn18-84ndfd_grib2.pdf

What tripped up my LDM processing was change #4, " Change encoding of 
Forecast Time value (Section 4, Octet 19; Template 4.8 and Template 4.9) 
to conform strictly to GRIB2 standards."

So variables like max temperature no longer appear as just "TMXK" in the 
LDM product ID, but now look like TMXK12, for example:

996607 20181101134834.067464 CONDUIT 000 
data2/ndfd/YGUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/TMXK10/2 m HGHT! 000000

In this case, the TMXK10 is the max temp over a 10 hour period.

Also, change #1 detailed in the PDF link above is important if you have 
software that converts the grib parameters into names. "TMP_surface" may 
now appear as "TMP_2maboveground" for example.

daryl

PS, here's a sampling of F010 LDM product ids from the 14z NDFD

20181101T141005.884119Z pqcat[9273] INFO pqcat.c:77:writeprod()     996607 
20181101134834.067464 CONDUIT 000  data2/ndfd/YGUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/TMXK10/2 m HGHT! 000000
20181101T141005.928200Z pqcat[9273] INFO pqcat.c:77:writeprod()     210425 
20181101134902.471510 CONDUIT 001  data2/ndfd/YSUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/SNOW06/0 - NONE! 000001
20181101T141007.139631Z pqcat[9273] INFO pqcat.c:77:writeprod()     294300 
20181101135533.191425 CONDUIT 009  data2/ndfd/YJUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/WXTR/0 - NONE! 000009
20181101T141007.809653Z pqcat[9273] INFO pqcat.c:77:writeprod()     467291 
20181101140025.412208 CONDUIT 000  data2/ndfd/YDUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/PP100000PA/0 - NONE! 000000
20181101T141007.841020Z pqcat[9273] INFO pqcat.c:77:writeprod()     591386 
20181101140044.698539 CONDUIT 001  data2/ndfd/YIUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/P06M/0 - NONE! 000001
20181101T141007.891519Z pqcat[9273] INFO pqcat.c:77:writeprod()     628450 
20181101140115.976494 CONDUIT 009  data2/ndfd/YBUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/DRCT/10 m HGHT! 000009
20181101T141007.892237Z pqcat[9273] INFO pqcat.c:77:writeprod()     526267 
20181101140116.075108 CONDUIT 009  data2/ndfd/YAUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/CLD/0 - NONE! 000009
20181101T141007.924379Z pqcat[9273] INFO pqcat.c:77:writeprod()     244802 
20181101140121.713556 CONDUIT 009  data2/ndfd/YKUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/WVHGT/0 - NONE! 000009
20181101T141008.351754Z pqcat[9273] INFO pqcat.c:77:writeprod()     744299 
20181101140601.134762 CONDUIT 009  data2/ndfd/YRUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/RELH/2 m HGHT! 000009
20181101T141008.522341Z pqcat[9273] INFO pqcat.c:77:writeprod()    1071142 
20181101140806.504540 CONDUIT 009  data2/ndfd/YEUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/TMPK/2 m HGHT! 000009
20181101T141008.618877Z pqcat[9273] INFO pqcat.c:77:writeprod()    1285840 
20181101140915.415201 CONDUIT 009  data2/ndfd/YWUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/GUST/10 m HGHT! 000009
20181101T141008.649770Z pqcat[9273] INFO pqcat.c:77:writeprod()     840798 
20181101140922.698412 CONDUIT 009  data2/ndfd/YFUZ98_KWBN_011346.grib2 
!grib2/nwstg/NWS_0/#000/201811011400F010/DWPK/2 m HGHT! 000009


-- 
/**
  * daryl herzmann
  * Systems Analyst III -- Iowa Environmental Mesonet
  * https://mesonet.agron.iastate.edu
  */