diff --git a/ush/config.sh.RRFS_NA_3km b/ush/config.sh.RRFS_NA_3km
new file mode 100644
index 000000000..a511abcdc
--- /dev/null
+++ b/ush/config.sh.RRFS_NA_3km
@@ -0,0 +1,132 @@
+MACHINE="jet"
+ACCOUNT="nrtrr"
+#RESERVATION="rrfsdet"
+EXPT_BASEDIR="/home/rtrr/RRFS"
+EXPT_SUBDIR="RRFS_NA_3km_dev1"
+
+if [[ -n $RESERVATION ]] ; then
+  ACCOUNT=rtrr
+  SERVICE_ACCOUNT=nrtrr
+  PARTITION_DEFAULT=kjet
+  PARTITION_FCST=kjet
+  PARTITION_GRAPHICS=kjet
+  PARTITION_ANALYSIS=kjet
+else
+  PARTITION_DEFAULT=kjet
+fi
+
+FIXLAM_NCO_BASEDIR=/mnt/lfs4/BMC/nrtrr/RRFS/fix/fix_lam.20210128
+FIXgsm=/mnt/lfs4/BMC/nrtrr/RRFS/fix/fix_am.20210128
+GWD_HRRRsuite_BASEDIR=/mnt/lfs4/BMC/nrtrr/RRFS/fix/fix_lam.20210128
+
+FIX_GSI=/mnt/lfs4/BMC/nrtrr/RRFS/fix/fix_gsi
+FIX_CRTM=/home/rtrr/FIX_EXEC_MODULE/crtm/CRTM_v2.3.0
+
+VERBOSE="TRUE"
+
+RUN_ENVIR="nco"
+PREEXISTING_DIR_METHOD="rename"
+
+PREDEF_GRID_NAME=RRFS_NA_3km
+
+DO_DACYCLE="FALSE"
+
+QUILTING="TRUE"
+CCPP_PHYS_SUITE="FV3_HRRR"
+
+EXTRN_MDL_ICS_OFFSET_HRS="0"
+BOUNDARY_LEN_HRS="48"
+BOUNDARY_LONG_LEN_HRS="3"
+LBC_SPEC_INTVL_HRS="3"
+EXTRN_MDL_LBCS_OFFSET_HRS="6"
+EXTRN_MDL_LBCS_SEARCH_OFFSET_HRS="0"
+
+#CYCLEDAY="1-4"
+#CYCLEMONTH="5-7"
+INITIAL_CYCLEDEF="00 00,12 ${CYCLEDAY} ${CYCLEMONTH} 2021 *"
+BOUNDARY_CYCLEDEF="00 00,12 ${CYCLEDAY} ${CYCLEMONTH} 2021 *"
+PREP_COLDSTART_CYCLEDEF="00 00,12 ${CYCLEDAY} ${CYCLEMONTH} 2021 *"
+#PREP_WARMSTART_CYCLEDEF="00 00-02,04-14,16-23 ${CYCLEDAY} ${CYCLEMONTH} 2021 *" <!-- placeholder; future capability -->
+#ANALYSIS_CYCLEDEF="00 00-23/01 ${CYCLEDAY} ${CYCLEMONTH} 2021 *"                <!-- placeholder; future capability -->
+FORECAST_CYCLEDEF="00 00,12 ${CYCLEDAY} ${CYCLEMONTH} 2021 *"
+POSTPROC_CYCLEDEF="00 00,12 ${CYCLEDAY} ${CYCLEMONTH} 2021 *"
+#POSTPROC_LONG_CYCLEDEF="00 03,09,15,21 ${CYCLEDAY} ${CYCLEMONTH} 2021 *"        <!-- placeholder; future capability -->
+ARCHIVE_CYCLEDEF="00 07 * * 2021 *"
+
+FCST_LEN_HRS="30"
+POSTPROC_LEN_HRS="30"
+POSTPROC_LONG_LEN_HRS="30"
+FCST_LEN_HRS_CYCLES=(30 03 03 03 03 03 03 03 03 03 03 03 30 03 03 03 03 03 03 03 03 03 03 03)
+#for i in {0..23}; do FCST_LEN_HRS_CYCLES[$i]=21; done
+#for i in {3..23..6}; do FCST_LEN_HRS_CYCLES[$i]=63; done
+DA_CYCLE_INTERV="1"
+RESTART_INTERVAL="1 2 3 4 5 6"
+
+NCORES_RUN_ANAL=240
+HALO_BLEND=10
+
+NNODES_MAKE_ICS="12"
+NNODES_MAKE_LBCS="12"
+PPN_MAKE_ICS="4"
+PPN_MAKE_LBCS="4"
+WTIME_MAKE_LBCS="01:00:00"
+
+WTIME_RUN_FCST="08:00:00"
+
+NNODES_RUN_POST="6"
+
+DATE_FIRST_CYCL="20210430"
+DATE_LAST_CYCL="20210430"
+CYCL_HRS=( "00" )
+
+EXTRN_MDL_NAME_ICS="FV3GFS"
+EXTRN_MDL_NAME_LBCS="FV3GFS"
+
+FV3GFS_FILE_FMT_ICS="grib2"
+FV3GFS_FILE_FMT_LBCS="grib2"
+
+envir="para"
+
+NET="RRFS_NA_3km"
+TAG="RRFS_dev1_NA_3km"
+
+USE_CUSTOM_POST_CONFIG_FILE="TRUE"
+# Below:  use EMC_post control file from 13-km NA configuration (provisional only)
+CUSTOM_POST_CONFIG_FP="/mnt/lfs4/BMC/nrtrr/RRFS/dev1-13km-NA-ufs-srweather-app/src/EMC_post/parm/postxconfig-NT-fv3lam_rrfs.txt"
+ARCHIVEDIR="/5year/BMC/wrfruc/rrfs_na_3km_dev1"
+NCARG_ROOT="/apps/ncl/6.5.0-CentOS6.10_64bit_nodap_gnu447"
+NCL_HOME="/home/rtrr/RRFS/graphics"
+NCL_REGION="conus"
+MODEL="RRFS_NA_3km"
+ADDNL_OUTPUT_GRIDS=( "hrrr" )
+
+#
+# In NCO mode, the following don't need to be explicitly set to "FALSE" 
+# in this configuration file because the experiment generation script
+# will do this (along with printing out an informational message).
+#
+#RUN_TASK_MAKE_GRID="FALSE"
+#RUN_TASK_MAKE_OROG="FALSE"
+#RUN_TASK_MAKE_SFC_CLIMO="FALSE"
+
+RUN="RRFS_NA_3km_dev1"
+COMINgfs=""
+
+STMP="/lfs4/BMC/nrtrr/NCO_dirs/stmp"  # Path to directory STMP that mostly contains input files.
+PTMP="/lfs4/BMC/nrtrr/NCO_dirs/ptmp"  # Path to directory STMP that mostly contains input files.
+
+#
+# In NCO mode, the user must manually (e.g. after doing the build step)
+# create the symlink "${FIXrrfs}/fix_sar" that points to EMC's FIXLAM
+# directory on the machine.  For example, on hera, the symlink's target
+# needs to be
+#
+#   /scratch2/NCEPDEV/fv3-cam/emc.campara/fix_fv3cam/fix_sar
+#
+# The experiment generation script will then set FIXLAM to 
+#
+#   FIXLAM="${FIXrrfs}/fix_lam/${EMC_GRID_NAME}"
+#
+# where EMC_GRID_NAME has the value set above.
+#
+
diff --git a/ush/set_predef_grid_params.sh b/ush/set_predef_grid_params.sh
index cf84bfd6a..27f336ab8 100644
--- a/ush/set_predef_grid_params.sh
+++ b/ush/set_predef_grid_params.sh
@@ -1147,6 +1147,48 @@ case ${PREDEF_GRID_NAME} in
     WRTCMP_dlat="0.11691181"
   fi
   ;;
+#
+#-----------------------------------------------------------------------
+#
+# The RRFS North America domain with ~3km cells.
+#
+#-----------------------------------------------------------------------
+#
+"RRFS_NA_3km")
+
+  GRID_GEN_METHOD="ESGgrid"
+
+  ESGgrid_LON_CTR="-107.5"
+  ESGgrid_LAT_CTR="51.5"
+
+  ESGgrid_DELX="3000.0"
+  ESGgrid_DELY="3000.0"
+
+  ESGgrid_NX=3640
+  ESGgrid_NY=2520
+
+  ESGgrid_WIDE_HALO_WIDTH="6"
+
+  DT_ATMOS="${DT_ATMOS:-36}"
+
+  LAYOUT_X="${LAYOUT_X:-18}"
+  LAYOUT_Y="${LAYOUT_Y:-36}"
+  BLOCKSIZE="${BLOCKSIZE:-28}"
+
+  if [ "$QUILTING" = "TRUE" ]; then
+    WRTCMP_write_groups="1"
+    WRTCMP_write_tasks_per_group="144"
+    WRTCMP_output_grid="rotated_latlon"
+    WRTCMP_cen_lon="-112.0"
+    WRTCMP_cen_lat="48.0"
+    WRTCMP_lon_lwr_left="-51.0"
+    WRTCMP_lat_lwr_left="-33.0"
+    WRTCMP_lon_upr_rght="51.0"
+    WRTCMP_lat_upr_rght="33.0"
+    WRTCMP_dlon="0.025"
+    WRTCMP_dlat="0.025"
+  fi
+  ;;
 
 esac
 
diff --git a/ush/valid_param_vals.sh b/ush/valid_param_vals.sh
index 0716f1219..65757c47a 100644
--- a/ush/valid_param_vals.sh
+++ b/ush/valid_param_vals.sh
@@ -20,6 +20,7 @@ valid_vals_PREDEF_GRID_NAME=( \
 "GSL_HAFSV0.A_3km" \
 "GSD_HRRR_AK_50km" \
 "GSD_RAP13km" \
+"RRFS_NA_3km" \
 )
 valid_vals_CCPP_PHYS_SUITE=( \
 "FV3_CPT_v0" \