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20011211: Differences in Eta 212/215 grid data





Daryl,

There are 2 sources for the precipitation on the 212 grid. The ETA model 
identified
as number 84, and the EAT model identified as number 89. The ICWF project run by
the techniques development lab (TDL) within NOAA produces the QPF grids for
precipitation forecasts identified as model #89. The NOAAPORT 215 grid has only
the precipitation grids identified as model 84, though the CONDUIT stream does
have the icwf on the 20km grid as well.

Here is the reception information on these grids:

Dec 11 15:03:00 grib/ncep/ETA_84/#212/200112111200/F048/APCP/sfc/ YERI98 KWBE 
111200
Dec 11 16:13:35 grib/ncep/ETA_89/#212/200112111200/F048/APCP/sfc/ YERI98 KWBD 
111200 PAA

Dec 11 15:03:57 grib/ncep/ETA_84/#215/200112111200/F048/APCP/sfc/ YEUI98 KWBE 
111200

The ETA model identified as ETA_89 uses the WMO identifying center of KWBD,
while the ETA_84 uses KWBE. The ETA212 field you see with the much grater
forecast amount is the latter that came in which is the icwf prediction.

Previously, the 89 model id as the 0 & 12Z run, while the 85 run was the 6 & 18Z
run previously called "meso eta". Now, all 4 runs use the identical model 84...
but the TDL lab is creating QPF grids (thats a big push in areas that need
improvement in NWS). I found a somewhat old web page describing ICWF and ETA at:
http://www.emc.ncep.noaa.gov/mmb/research/FAQ-eta.html#POST12

The ICWF grids do have some useful prob of precip grids- but I can see that we
should separate the 2 sources to avoid confusion.

You are using dcgrib2 in your file actions below. You could make the pattern
specific to KWBE to eliminate the icwf grids (KWBD). Or, you can make dcgrib2
create a separate gempak grid file for the icwf grids.

The GEMPAK file $GEMTBL/grid/gribkey.tbl file determines the output file name
for dcgrib2. At present, there is a single output file for both model 84 and 89
for for the various grids (which I tried to have for backwards compatibility
with all three model numbers 84, 85 and 89).

I've attatched a replacement gribkey.tbl which will store the ETA_84 products
in the same YYYYMMDDHH_eta@@@.gem files, while storing the ETA_89 products in
files named YYYYMMDDHH_icwf@@@.gem. I will use this segregated file naming
gribkey.tbl file in new releases of GEMPAK as well.

Steve Chiswell
Unidata User SUpport



>
>
> >From: Daryl Herzmann <address@hidden>
> >Organization: UCAR/Unidata
> >Keywords: 200112112255.fBBMthN15530
>
> >Hello,
> >     Dr William Gallus, here at ISU, noticed something peculiar.  The
> >forecasted magnitude of precip from this mornings 12Z Eta run is vasty
> >different between the 212 grid and the 215 grid.  I have no idea how to
> >explain this.
> >
> >     I used gdlist to look at the two grid files
> >with params
> > GDATTIM  = F48
> > GLEVEL   = 0
> > GVCORD   = NONE
> > GFUNC    = P06I
> > GDFILE   = 2001121112_eta212.gem
> > GAREA    = IA
> > PROJ     = MER
> > SCALE    = 0
> > OUTPUT   = T
> >
> >The max value for this subset is 1.58 inches
> >
> >then I change
> > GDFILE   = 2001121112_eta215.gem
> >
> >The max value for this subset is 0.47 inches
> >
> >Here is my LDM pqact.conf entries
> >
> ># Process 215 ETA
> >HRS     ^[YZ].U.*/mETA
> >        PIPE    dcgrib2 -d data/gempak/logs/dcgrib.log
> >                -e GEMTBL=/home/nawips/nawips/gempak/tables
> >
> ># Process 212 ETA
> >HRS     ^[YZ].R.*/mETA
> >        PIPE    dcgrib2 -d data/gempak/logs/dcgrib.log
> >                -e GEMTBL=/home/nawips/nawips/gempak/tables
> >
> >
> >Ideas??
> >
> >Thanks,
> >     Daryl
> >
> >
> >--
> >/**
> > * Daryl Herzmann (address@hidden)
> > * Program Assistant -- Iowa Environmental Mesonet
> > * http://mesonet.agron.iastate.edu
> > */
> >
> >
> >
>
>
!center sub modelid grid   Output grid file name                   max_grids
!
! ETA
007   x   084,85    212    data/gempak/model/YYYYMMDDHH_eta@@@.gem   18000
007   x   089       212    data/gempak/model/YYYYMMDDHH_icwf@@@.gem   2000
007   x   084,85,89 216    data/gempak/model/YYYYMMDDHH_eta@@@.gem    6000
007   x   084,85,89 104    data/gempak/model/YYYYMMDDHH_eta@@@.gem   12000
007   x   084,85    @@@    data/gempak/model/YYYYMMDDHH_eta@@@.gem    2000
007   x   089       @@@    data/gempak/model/YYYYMMDDHH_icwf@@@.gem   2000
!
! NGM
007   x   039       @@@    data/gempak/model/YYYYMMDDHH_ngm@@@.gem    2000
!
! RUC
007   x   105       @@@    data/gempak/model/YYYYMMDDHH_ruc@@@.gem    7500
007   x   086       @@@    data/gempak/model/YYYYMMDDHH_ruc@@@.gem    2000
!
! AVN grids
007   x   077,81,96 037    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 038    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 039    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 040    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 041    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 042    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 043    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 044    data/gempak/model/YYYYMMDDHH_thin.gem      2000
007   x   077,81,96 002    data/gempak/model/YYYYMMDDHH_avn@@@.gem    9000
007   x   077,81,96 003    data/gempak/model/YYYYMMDDHH_avn@@@.gem   12000
007   x   077,81,96 @@@    data/gempak/model/YYYYMMDDHH_avn@@@.gem    2000
!
! MRF
007   x   078,80,94 025    data/gempak/model/YYYYMMDDHH_mrf.gem       1500
007   x   078,80,94 026    data/gempak/model/YYYYMMDDHH_mrf.gem       1500
007   2   078,80,82,94 @@@ data/gempak/model/YYYYMMDDHH_ens@@@.gem   20000
007   x   078,80,82,94 002 data/gempak/model/YYYYMMDDHH_mrf@@@.gem    6000
007   x   078,80,82,94 003 data/gempak/model/YYYYMMDDHH_mrf@@@.gem    5000
007   x   078,80,82,94 @@@ data/gempak/model/YYYYMMDDHH_mrf@@@.gem    1500
!
! OCEAN
007   x   044       @@@    data/gempak/model/YYYYMMDDHH_ocn.gem        500
007   x   010       @@@    data/gempak/model/YYYYMMDDHH_wave@@@.gem    500
007   x   121       @@@    data/gempak/model/YYYYMMDDHH_wave@@@.gem    500
007   x   122       @@@    data/gempak/model/YYYYMMDDHH_wave@@@.gem    500
!
! ICE
007   x   120       @@@    data/gempak/model/YYYYMMDDHH_ice@@@.gem     200
!
! UKMET Thinned grids
074   x   15,44,45  037    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
074   x   15,44,45  038    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
074   x   15,44,45  039    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
074   x   15,44,45  040    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
074   x   15,44,45  041    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
074   x   15,44,45  042    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
074   x   15,44,45  043    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
074   x   15,44,45  044    data/gempak/model/YYYYMMDDHH_ukmet.gem     1500
!
! UKMET Other
074   x   015       @@@    data/gempak/model/YYYYMMDDHH_egrr@@@.gem   1000
!
! ECMWF
! ECMWF changes their model id so often, best to match any modelid from 
! center #98.
098   x   ???       001    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       002    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       003    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       004    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       009    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       010    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       011    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       012    data/gempak/model/YYYYMMDDHH_ecmf1.gem     1500
098   x   ???       005    data/gempak/model/YYYYMMDDHH_ecmf2.gem     1500
098   x   ???       006    data/gempak/model/YYYYMMDDHH_ecmf2.gem     1500
098   x   ???       007    data/gempak/model/YYYYMMDDHH_ecmf2.gem     1500
098   x   ???       008    data/gempak/model/YYYYMMDDHH_ecmf2.gem     1500
098   x   ???       @@@    data/gempak/model/YYYYMMDDHH_ecmwf@@@.gem   100
!
! FSL RUC
059   x   105       @@@    data/gempak/model/YYYYMMDDHH_ruc@@@.gem    7500
!
! FNOC NOGAPS/COAMPS
058   x   041,58    @@@    data/gempak/model/YYYYMMDDHH_nogaps@@@.gem 5000
058   x   082       020    data/gempak/model/YYYYMMDDHH_coamps_conus  1500
058   x   027       186    data/gempak/model/YYYYMMDDHH_coamps_centam 1500
058   x   063       187    data/gempak/model/YYYYMMDDHH_coamps_watl   1500
058   x   060       188    data/gempak/model/YYYYMMDDHH_coamps_epac   1500
058   x   ???       @@@    data/gempak/model/YYYYMMDDHH_coamps###_@@@ 1500
!
! RADAR Mosaic
008   x   000       @@@    data/gempak/model/YYYYMMDD_radar.gem        100
!
! Canadian Meteorological Service
054   x   036       @@@    data/gempak/model/YYYYMMDDHH_cmcreg.gem    1000
!
! River products
009  150  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_ktua@@@.gem        
500
009  154  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_korn@@@.gem        
500
009  155  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_krha@@@.gem        
500
009  156  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_kkrf@@@.gem        
500
009  157  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_kmsr@@@.gem        
500
009  158  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_ktar@@@.gem        
500
009  160  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_ktir@@@.gem        
500
009  161  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_kalr@@@.gem        
500
009  162  180       @@@    data/gempak/model/qpf/YYYYMMDDHH_kfwr@@@.gem        
500
009   x   180       @@@    data/gempak/model/qpf/YYYYMMDDHH_%%%_###_@@@.gem    
500
009   x   185       @@@    data/gempak/model/nohrsc/YYYYMMDDHH_kmsr@@@.gem     
500
!
007   5   181       218    data/gempak/model/qpf/YYYYMMDDHH_qpe.gem     500
!
! Unidata RADAR mosaic
060   1     1       @@@    YYYYMMDDHHNN_nexr.gem 500
060   1     2       @@@    YYYYMMDDHHNN_nexr.gem 500