<1999OCT04> Examples of NCEP Eta prec data: ---------------------------------------------------------------------------------------- prevday.980701 ASCII File ---------------------------------------------------------------------------------------- DAYOW X RFC PCP DDD 6/27/98 *** Format Description: ZBRM5 4430 9267 548 SEM5 4625 9352 400 TAYW3 4432 9112 541 ID LAT LON 24-hr accumuated precipitation BRTS2 4592 9800 510 *100 *100 inches*100 HIXW3 4450 9108 510 46.25N 93.52W 4.00 inches CNFM5 4452 9290 456 ZUMM5 4428 9243 450 BETV1 4388 7263 440 NRFM5 4447 9315 425 CPDO1 4022 8207 400 ---------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------- rfcday.980701 ASCII File ---------------------------------------------------------------------------------------- DAYOW X RFC PCP DDD 7/ 1/98 *** (same as prevday) EVPA3 344211127 976 FOXM3 4203 7112 408 HGCP1 4160 7660 406 PEYT2 363810083 400 SOUC3 4157 7288 393 BLAO2 3682 9723 380 SKIO2 3637 9600 368 BLKO2 3682 9727 367 BLBC3 4165 7348 362 ---------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------- rfcanl.980701 GRIB Binary, gridded ---------------------------------------------------------------------------------------- wgrib rfcanl.980701 -V rec 1:0:date 1998063012 APCP kpds5=61 kpds6=1 kpds7=0 levels=(0,0) grid=212 sfc 0-24hr acc: bitmap: 20427 undef APCP=Total precipitation [kg/m^2] timerange 4 P1 0 P2 24 TimeU 1 nx 185 ny 129 GDS grid 3 num_in_ave 0 missing 0 center 7 subcenter 0 process 0 Table 2 Lambert Conf: Lat1 12.190000 Lon1 -133.459000 Lov -95.000000 Latin1 25.000000 Latin2 25.000000 LatSP 0.000000 LonSP 0.000000 North Pole (185 x 129) Dx 40.635000 Dy 40.635000 scan 64 mode 8 min/max data -0.25 83.31 num bits 14 BDS_Ref -25 DecScale 2 BinScale 0 ---------------------------------------------------------------------------------------- To use GrADS to display rfcanl.980701, you need GrADS 1.7beta or higher version. The rfcanl.980701.ctl looks like the following: dset ^rfcanl.980701 index ^rfcanl.980701.idx undef 9.999E+20 title rfcanl.980701 * produced by grib2ctl v0.9.11 options yrev dtype grib 212 pdef 185 129 lcc 35.0 -95.0 105 49 25 25 -95 40635 40635 xdef 181 linear 220 0.5 ydef 091 linear 015 0.5 tdef 1 linear 12Z01jul98 1mo zdef 1 linear 1 1 vars 1 APCPsfc 0 61,1,0 ** Total precipitation [kg/m^2] ENDVARS The "tdef 1 linear 12Z01jul98 1mo" differs from grib2ctl will generate by 24 hours. The GRIB data has time as "12Z30jun98", but it is valid at "12Z01jul98" since it is 24-hour accumulation data. A few other points are: "bitmap: 20427 undef" means there are 20427 out of (185x129) grids undefined. "timerange 4" is to indicate the grids are "accumulative" values. =======================================================================================