This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Neil, You have several different model projection here. A Gempak grid file can only have one grid projection, so your errors are from trying to write a grid to a file that doesn't match the same grid. Below from your log messages, you see: Grid ID 213 Grid ID 202 Grid ID 211 etc. These are denoted by the third letter in the wmo header H, I, Q, eg: Y.H Y.I Y.Q etc. The tutorial examples for the AVN shows the various sectors that are currently carried on NOAAport. See: http://www.unidata.ucar.edu/packages/gempak/tutorial/pqact/decoders.tbl # # AVN model output # Grid #201 N. Hemisphere 381km: ^Y.A... KWBC.*(/mAVN|/mSSIAVN) # Grid #202 CONUS 190km: ^Y.I... KWBC.*(/mAVN|/mSSIAVN) # Grid #203 Alaska 190km: ^Y.J... KWBC.*(/mAVN|/mSSIAVN) # Grid #211 CONUS 80km: ^Y.Q... KWBC.*(/mAVN|/mSSIAVN) # Grid #213 CONUS 95km: ^Y.H... KWBC.*(/mAVN|/mSSIAVN) # Select any/all grids desired from [QAIJH] HRS ^[YZ].[QAIJH]... KWB. ([0-3][0-9])([0-2][0-9]).*(/mAVN|/mSSIAVN) PIPE /usr/local/ldm/decoders/dcgrib -d data/gempak/logs/dcgrib.log -g /home/gempak/NAWIPS-5.4/gempak5.4/tables PACK data/gempak/hds/YYYYMMDDHH_avn@@@.gem This pqact.conf example will capture all of the grids referenced in the comments above. Since these grids all have different grid projection, they have to be written to different files. The @@@ template in the file name will be replaced with the grid number sown above. This allows you to use a single pqact.conf action for all these grids. If you do not need all three of the CONUS sectors, you could choose not to receive the 202 and 213 grids by removing the letters H & I from the pqact.conf pattern, eg: ^[YZ].[QAJ] etc. The reason the NWS broadcasts all these different grids is that AWIPS doesn't reproject the grid based on a user choice of projection like GEMPAK can. Gempak can make do with a single grid. Instead, AWIPS uses a different grid for each type of display. One other AVN grid dataset you can obtain is the Global thinned grids. # Global AVN (Spectral) Thinned grids # Grid octets I-P will be stitched togethir as a single global grid # HRS ^H.[I-P]... KWB. ([0-3][0-9])([0-2][0-9]).* PIPE /usr/local/ldm/decoders/dcgrib -d data/gempak/logs/dcgrib.log -g /home/gempak/NAWIPS-5.4/gempak5.4/tables -q"lin,dlat=2.5,dlon=2.5" PACK data/gempak/hds/YYYYMMDDHH_thin.gem The thinned grids are broadcast using 8 individual octects to cover the globe. These grids can be stitched together to form a single global grid using the above pattern. The -q option specifies the grid dx & dy that the resultant grid will have. Steve Chiswell Unidata User Support >From: "Neil R. Smith" <address@hidden> >Organization: Dept. Atmospheric Science, TAMU >Keywords: 200003091742.KAA17952 >Hi folks, > >I'm getting these dcgrib errors with the AVN global spectral model: >. >. >Mar 09 17:30:14 3Q:coriolis dcgrib[8714]: YTHI25 KWBC 091200 skipped >1000309/1200 Grid ID 213 11 100 0 250 >Mar 09 17:30:14 5Q:coriolis dcgrib[8714]: Invalid center id/grid id >combination: 7 202 48 >Mar 09 17:30:14 3Q:coriolis dcgrib[8714]: YTII20 KWBC 091200 skipped >1000309/1200 Grid ID 202 11 100 0 200 >Mar 09 17:30:14 5Q:coriolis dcgrib[8714]: Invalid center id/grid id >combination: 7 202 48 >Mar 09 17:30:14 3Q:coriolis dcgrib[8714]: YTII25 KWBC 091200 skipped >1000309/1200 Grid ID 202 11 100 0 250 >Mar 09 17:30:15 5Q:coriolis dcgrib[8714]: Invalid center id/grid id >combination: 7 211 28 >Mar 09 17:30:15 3Q:coriolis dcgrib[8714]: YTQI15 KWBC 091200 skipped >1000309/1200 Grid ID 211 11 100 0 150 >Mar 09 17:30:16 5Q:coriolis dcgrib[8714]: Invalid center id/grid id >combination: 7 211 28 >Mar 09 17:30:16 3Q:coriolis dcgrib[8714]: YTQI20 KWBC 091200 skipped >1000309/1200 Grid ID 211 11 100 0 200 >Mar 09 17:30:20 5Q:coriolis dcgrib[8714]: Invalid center id/grid id >combination: 7 213 52 >Mar 09 17:30:20 3Q:coriolis dcgrib[8714]: YTHI20 KWBC 091200 skipped >1000309/1200 Grid ID 213 11 100 0 200 >Mar 09 17:30:20 5Q:coriolis dcgrib[8714]: Invalid center id/grid id >combination: 7 202 48 >. >. >ldm is 5.0.6 >Is this a table error? >Thanks, -neil >-- >Neil R. Smith, Comp. Sys. Mngr. address@hidden >Dept. Atmospheric Sci., Texas A&M Univ. 979/845-6272 FAX:979/862-4466 >