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[IDD #CHL-454861]: NCEP RAP output

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  • Subject: [IDD #CHL-454861]: NCEP RAP output
  • Date: Mon, 15 Oct 2012 12:04:15 -0600
Hi Bongchul,

re:
> I am Bongchul at the University of Iowa and have some questions about
> NCEP RAP forecast data.
> 
> I recently found out that NCEP RUC model has been replaced with RAP
> model and am wondering if the RAP output data are available through LDM.

Yes.  The RUC data that was available in the IDD NGRID and CONDUIT datastreams
was replaced by RAP data.  In order to lessen the disruption that the change
might have caused, NCEP chose to keep the model number the same in the
data products; this has had the effect that RAP data is labeled (meaning
LDM/IDD Product IDs) as if it is RUC2 data.  Here is an example:

<as 'ldm'>
% notifyme -vl- -f NGRID -o 3600 -p RUC2 -h idd.unidata.ucar.edu

Oct 15 17:58:10 notifyme[25079] NOTE: Starting Up: idd.unidata.ucar.edu: 
20121015165810.147 TS_ENDT {{NGRID,  "RUC2"}}
Oct 15 17:58:10 notifyme[25079] NOTE: LDM-5 desired product-class: 
20121015165810.147 TS_ENDT {{NGRID,  "RUC2"}}
Oct 15 17:58:10 notifyme[25079] INFO: Resolving idd.unidata.ucar.edu to 
128.117.140.3 took 0.000512 seconds
Oct 15 17:58:10 notifyme[25079] NOTE: NOTIFYME(idd.unidata.ucar.edu): OK

Oct 15 17:58:11 notifyme[25079] INFO:    27685 20121015165910.122   NGRID 
5399916  LTDJ12 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/TMPK/125 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    33784 20121015165910.136   NGRID 
5399917  LRDJ95 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/RELH/950 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    27842 20121015165910.147   NGRID 
5399918  LTDJ72 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/TMPK/725 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    32671 20121015165910.158   NGRID 
5399919  LRDJ22 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/RELH/225 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    34319 20121015165910.168   NGRID 
5399920  LVDJ93 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/VREL/975 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    37748 20121015165910.182   NGRID 
5399921  LHDJ17 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/HGHT/175 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    29490 20121015165910.190   NGRID 
5399922  LTDJ82 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/TMPK/825 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    33511 20121015165910.202   NGRID 
5399923  LHDJ52 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/HGHT/525 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    38030 20121015165910.211   NGRID 
5399924  LHDJ95 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/HGHT/950 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    34460 20121015165910.221   NGRID 
5399925  LVDJ80 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/VREL/800 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    33004 20121015165910.231   NGRID 
5399926  LRDJ40 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/RELH/400 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    33238 20121015165910.240   NGRID 
5399927  LRDJ60 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/RELH/600 hPa 
PRES
Oct 15 17:58:11 notifyme[25079] INFO:    25743 20121015165910.248   NGRID 
5399928  LTDJ27 KWBG 151600 !grib2/ncep/RUC2/#130/201210151600F009/TMPK/275 hPa 
PRES

All of these fields are actually from the RAP, not RUC2.

re:
> If the data is available, could you please let me know how I configure
> the local LDM here to get the data.

You need to add a REQUEST line in your ~ldm/etc/ldmd.conf file for NGRID
data.  If all you want is the RAP data, then the REQUEST would look like:

REQUEST  NGRID  "RUC2" <upstream host name>

The same advice holds for data in the CONDUIT datastream; simply replace
NGRID with CONDUIT.

NB:

- after making a change to the LDM configuration file, ~ldm/etc/ldmd.conf,
  one needs to stop and then restart the LDM for the change(s) to take
  effect

- you will need to craft LDM pattern-action file action(s) to do something
  with the new data that you will REQUEST

re:
> For your information, we are currently running LDM to get radar Level
> II data.

OK.  If you are not already ingesting NGRID or CONDUIT data, you will
be adding REQUEST line(s) to ldmd.conf.  If you are already requesting
either of these datastreams, you may be altering what you are REQUESTing
or now recognizing that the products labeled RUC2 are actually from
the RAP model.

re:
> Thank you,

No worries.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: CHL-454861
Department: Support IDD
Priority: Normal
Status: Closed