diff --git a/modulefiles/build.s4.intel b/modulefiles/build.s4.intel
deleted file mode 100644
index 37cdf2a0c..000000000
--- a/modulefiles/build.s4.intel
+++ /dev/null
@@ -1,27 +0,0 @@
-#%Module#####################################################
-## Build and run module for S4
-#############################################################
-
-module load license_intel/S4
-module use /data/prod/hpc-stack/modulefiles/stack
-module load hpc/1.1.0
-module load hpc-intel/18.0.4
-module load hpc-impi/18.0.4
-
-module load bacio/2.4.1
-module load g2/3.4.1
-module load ip/3.3.3
-module load nemsio/2.5.2
-module load sp/2.3.3
-module load w3nco/2.4.1
-module load sfcio/1.4.1
-module load sigio/2.3.2
-
-module load jasper/2.0.22
-module load zlib/1.2.11
-module load png/1.6.35
-
-module load hdf5/1.10.6
-module load netcdf/4.7.4
-module load nccmp/1.8.7.0
-module load esmf/8_1_0_beta_snapshot_27
diff --git a/modulefiles/build.s4.intel.lua b/modulefiles/build.s4.intel.lua
new file mode 100644
index 000000000..c9418d420
--- /dev/null
+++ b/modulefiles/build.s4.intel.lua
@@ -0,0 +1,59 @@
+help([[
+Load environment to compile UFS_UTILS on S4 using Intel
+]])
+
+load(pathJoin("license_intel","S4"))
+prepend_path("MODULEPATH", "/data/prod/hpc-stack/modulefiles/stack")
+
+hpc_ver=os.getenv("hpc_ver") or "1.2.0"
+load(pathJoin("hpc", hpc_ver))
+
+hpc_intel_ver=os.getenv("hpc_intel_ver") or "2022.1"
+load(pathJoin("hpc-intel", hpc_intel_ver))
+
+impi_ver=os.getenv("impi_ver") or "2022.1"
+load(pathJoin("hpc-impi", impi_ver))
+
+bacio_ver=os.getenv("bacio_ver") or "2.4.1"
+load(pathJoin("bacio", bacio_ver))
+
+g2_ver=os.getenv("g2_ver") or "3.4.5"
+load(pathJoin("g2", g2_ver))
+
+ip_ver=os.getenv("ip_ver") or "3.3.3"
+load(pathJoin("ip", ip_ver))
+
+nemsio_ver=os.getenv("nemsio_ver") or "2.5.4"
+load(pathJoin("nemsio", nemsio_ver))
+
+sp_ver=os.getenv("sp_ver") or "2.3.3"
+load(pathJoin("sp", sp_ver))
+
+w3nco_ver=os.getenv("w3nco_ver") or "2.4.1"
+load(pathJoin("w3nco", w3nco_ver))
+
+sfcio_ver=os.getenv("sfcio_ver") or "1.4.1"
+load(pathJoin("sfcio", sfcio_ver))
+
+sigio_ver=os.getenv("sigio_ver") or "2.3.2"
+load(pathJoin("sigio", sigio_ver))
+
+zlib_ver=os.getenv("zlib_ver") or "1.2.11"
+load(pathJoin("zlib", zlib_ver))
+
+png_ver=os.getenv("png_ver") or "1.6.35"
+load(pathJoin("libpng", png_ver))
+
+hdf5_ver=os.getenv("hdf5_ver") or "1.10.6"
+load(pathJoin("hdf5", hdf5_ver))
+
+netcdf_ver=os.getenv("netcdf_ver") or "4.7.4"
+load(pathJoin("netcdf", netcdf_ver))
+
+nccmp_ver=os.getenv("nccmp_ver") or "1.8.9.0"
+load(pathJoin("nccmp", nccmp_ver))
+
+esmf_ver=os.getenv("esmf_ver") or "8.2.1b04"
+load(pathJoin("esmf", esmf_ver))
+
+whatis("Description: UFS_UTILS build environment")
diff --git a/reg_tests/chgres_cube/driver.s4.sh b/reg_tests/chgres_cube/driver.s4.sh
new file mode 100755
index 000000000..4e6e60119
--- /dev/null
+++ b/reg_tests/chgres_cube/driver.s4.sh
@@ -0,0 +1,224 @@
+#!/bin/bash
+
+#-----------------------------------------------------------------------------
+#
+# Run the chgres_cube consistency tests on S4.
+#
+# Set WORK_DIR to a general working location outside the UFS_UTILS directory.
+# The exact working directory (OUTDIR) will be WORK_DIR/reg_tests/chgres-cube. 
+# Set the PROJECT_CODE and QUEUE as appropriate.  To see which projects you 
+# are authorized to use, type
+# "sacctmgr show assoc Users=<USERNAME> format=account,user,qos"
+#
+# Invoke the script with no arguments.  A series of daisy-chained
+# jobs will be submitted.  To check the queue, type:
+# "squeue -u USERNAME".
+#
+# The run output will be stored in OUTDIR.  Log output from the suite
+# will be in LOG_FILE.  Once the suite has completed, a summary is
+# placed in SUM_FILE.
+#
+# A test fails when its output does not match the baseline files as
+# determined by the "nccmp" utility.  The baseline files are stored in
+# HOMEreg.
+#
+#-----------------------------------------------------------------------------
+
+set -x
+
+compiler=${compiler:-"intel"}
+
+source ../../sorc/machine-setup.sh > /dev/null 2>&1
+module use ../../modulefiles
+module load build.$target.$compiler
+module list
+
+export OUTDIR="${WORK_DIR:-/scratch/short/users/$LOGNAME}"
+export OUTDIR="${OUTDIR}/reg-tests/chgres-cube"
+
+PROJECT_CODE="${PROJECT_CODE:-star}"
+QUEUE="${QUEUE:-s4}"
+
+#-----------------------------------------------------------------------------
+# Should not have to change anything below here.  HOMEufs is the root
+# directory of your UFS_UTILS clone.  HOMEreg contains the input data
+# and baseline data for each test.
+#-----------------------------------------------------------------------------
+
+export UPDATE_BASELINE="FALSE"
+#export UPDATE_BASELINE="TRUE"
+
+if [ "$UPDATE_BASELINE" = "TRUE" ]; then
+  source ../get_hash.sh
+fi
+
+export HOMEufs=$PWD/../..
+
+export HOMEreg=/data/users/dhuber/save/nems/role.ufsutils/ufs_utils/reg_tests/chgres_cube
+
+LOG_FILE=consistency.log
+SUM_FILE=summary.log
+rm -f $LOG_FILE* $SUM_FILE
+
+export OMP_STACKSIZE=1024M
+
+export APRUN=srun
+export NCCMP=${NCCMP:-nccmp}
+rm -fr $OUTDIR
+
+#-----------------------------------------------------------------------------
+# Initialize C96 using FV3 warm restart files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log01
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST1=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.fv3.restart \
+      -o $LOG_FILE -e $LOG_FILE ./c96.fv3.restart.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize C192 using FV3 tiled history files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log02
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST2=$(sbatch --parsable --ntasks-per-node=6 --nodes=2 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c192.fv3.history \
+      -o $LOG_FILE -e $LOG_FILE ./c192.fv3.history.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize C96 using FV3 gaussian nemsio files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log03
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST3=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.fv3.nemsio \
+      -o $LOG_FILE -e $LOG_FILE ./c96.fv3.nemsio.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize C96 using spectral GFS sigio/sfcio files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log04
+export OMP_NUM_THREADS=6   # should match cpus-per-task
+TEST4=$(sbatch --parsable --ntasks-per-node=3 --cpus-per-task=6 --nodes=2 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.gfs.sigio \
+      -o $LOG_FILE -e $LOG_FILE ./c96.gfs.sigio.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize C96 using spectral GFS gaussian nemsio files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log05
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST5=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.gfs.nemsio \
+      -o $LOG_FILE -e $LOG_FILE ./c96.gfs.nemsio.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize regional C96 using FV3 gaussian nemsio files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log06
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST6=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.regional \
+      -o $LOG_FILE -e $LOG_FILE ./c96.regional.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize C96 using FV3 gaussian netcdf files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log07
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST7=$(sbatch --parsable --ntasks-per-node=12 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.fv3.netcdf \
+      -o $LOG_FILE -e $LOG_FILE ./c96.fv3.netcdf.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize global C192 using GFS GRIB2 files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log08
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST8=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J c192.gfs.grib2 \
+      -o $LOG_FILE -e $LOG_FILE ./c192.gfs.grib2.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize CONUS 25-KM USING GFS GRIB2 files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log09
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST9=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J 25km.conus.gfs.grib2.conus \
+      -o $LOG_FILE -e $LOG_FILE ./25km.conus.gfs.grib2.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize CONUS 3-KM USING HRRR GRIB2 file WITH GFS PHYSICS.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log10
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST10=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:10:00 -A $PROJECT_CODE -q $QUEUE -J 3km.conus.hrrr.gfssdf.grib2.conus \
+      -o $LOG_FILE -e $LOG_FILE ./3km.conus.hrrr.gfssdf.grib2.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize CONUS 3-KM USING HRRR GRIB2 file WITH GSD PHYSICS AND SFC VARS FROM FILE.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log11
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST11=$(sbatch --parsable --ntasks-per-node=6 --nodes=2 -t 0:10:00 -A $PROJECT_CODE -q $QUEUE -J 3km.conus.hrrr.newsfc.grib2.conus \
+      -o $LOG_FILE -e $LOG_FILE ./3km.conus.hrrr.newsfc.grib2.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize CONUS 13-KM USING NAM GRIB2 file WITH GFS PHYSICS .
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log12
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST12=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J 13km.conus.nam.grib2.conus \
+      -o $LOG_FILE -e $LOG_FILE ./13km.conus.nam.grib2.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize CONUS 13-KM USING RAP GRIB2 file WITH GSD PHYSICS .
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log13
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST13=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J 13km.conus.rap.grib2.conus \
+      -o $LOG_FILE -e $LOG_FILE ./13km.conus.rap.grib2.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize CONUS 13-KM NA USING NCEI GFS GRIB2 file WITH GFS PHYSICS .
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log14
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST14=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J 13km.na.gfs.ncei.grib2.conus \
+      -o $LOG_FILE -e $LOG_FILE ./13km.na.gfs.ncei.grib2.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize C96 WAM IC using FV3 gaussian netcdf files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log15
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST15=$(sbatch --parsable --ntasks-per-node=12 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.fv3.netcdf2wam \
+      -o $LOG_FILE -e $LOG_FILE ./c96.fv3.netcdf2wam.sh)
+
+#-----------------------------------------------------------------------------
+# Initialize CONUS 25-KM USING  GFS PGRIB2+BGRIB2 files.
+#-----------------------------------------------------------------------------
+
+LOG_FILE=consistency.log16
+export OMP_NUM_THREADS=1   # should match cpus-per-task
+TEST16=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J 25km.conus.gfs.pbgrib2.conus \
+      -o $LOG_FILE -e $LOG_FILE ./25km.conus.gfs.pbgrib2.sh)
+
+#-----------------------------------------------------------------------------
+# Create summary log.
+#-----------------------------------------------------------------------------
+LOG_FILE=consistency.log
+sbatch --nodes=1 -t 0:01:00 -A $PROJECT_CODE -J chgres_summary -o $LOG_FILE -e $LOG_FILE \
+      --open-mode=append -q $QUEUE -d\
+      afterok:$TEST1:$TEST2:$TEST3:$TEST4:$TEST5:$TEST6:$TEST7:$TEST8:$TEST9:$TEST10:$TEST11:$TEST12:$TEST13:$TEST14:$TEST15:$TEST16 << EOF
+#!/bin/bash
+grep -a '<<<' $LOG_FILE*  > $SUM_FILE
+EOF
+
+exit 0
diff --git a/reg_tests/global_cycle/driver.s4.sh b/reg_tests/global_cycle/driver.s4.sh
new file mode 100755
index 000000000..439925c7e
--- /dev/null
+++ b/reg_tests/global_cycle/driver.s4.sh
@@ -0,0 +1,84 @@
+#!/bin/bash
+
+#-----------------------------------------------------------------------------
+#
+# Run global_cycle consistency test on S4.
+#
+# Set $WORK_DIR to your working directory.  Set the project code 
+# and queue as appropriate.
+#
+# Invoke the script from the command line as follows:  ./$script
+#
+# Log output is placed in consistency.log??.  A summary is
+# placed in summary.log
+#
+# A test fails when its output does not match the baseline files
+# as determined by the 'nccmp' utility.  This baseline files are
+# stored in HOMEreg.
+#
+#-----------------------------------------------------------------------------
+
+set -x
+
+compiler=${compiler:-"intel"}
+
+source ../../sorc/machine-setup.sh > /dev/null 2>&1
+module use ../../modulefiles
+module load build.$target.$compiler
+module list
+
+WORK_DIR="${WORK_DIR:-/scratch/short/users/$LOGNAME}"
+
+PROJECT_CODE="${PROJECT_CODE:-star}"
+QUEUE="${QUEUE:-batch}"
+
+#-----------------------------------------------------------------------------
+# Should not have to change anything below.
+#-----------------------------------------------------------------------------
+
+export UPDATE_BASELINE="FALSE"
+#export UPDATE_BASELINE="TRUE"
+
+if [ "$UPDATE_BASELINE" = "TRUE" ]; then
+  source ../get_hash.sh
+fi
+
+DATA_DIR="${WORK_DIR}/reg-tests/global-cycle"
+
+export HOMEreg=/data/users/dhuber/save/nems/role.ufsutils/ufs_utils/reg_tests/global_cycle
+
+export OMP_NUM_THREADS_CY=2
+
+export APRUNCY="srun"
+
+export NWPROD=$PWD/../..
+
+reg_dir=$PWD
+
+LOG_FILE=consistency.log01
+export DATA="${DATA_DIR}/test1"
+export COMOUT=$DATA
+TEST1=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J c768.fv3gfs \
+      -o $LOG_FILE -e $LOG_FILE ./C768.fv3gfs.sh)
+
+LOG_FILE=consistency.log02
+export DATA="${DATA_DIR}/test2"
+export COMOUT=$DATA
+TEST2=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J c768.lndincsoil \
+     -o $LOG_FILE -e $LOG_FILE ./C768.lndincsoil.sh)
+
+LOG_FILE=consistency.log03
+export DATA="${DATA_DIR}/test3"
+export COMOUT=$DATA
+TEST3=$(sbatch --parsable --ntasks-per-node=6 --nodes=1 -t 0:05:00 -A $PROJECT_CODE -q $QUEUE -J c768.lndincsnow \
+     -o $LOG_FILE -e $LOG_FILE ./C768.lndincsnow.sh)
+
+LOG_FILE=consistency.log
+sbatch --nodes=1 -t 0:01:00 -A $PROJECT_CODE -J summary -o $LOG_FILE -e $LOG_FILE \
+      --open-mode=append -q $QUEUE -d\
+      afterok:$TEST1:$TEST2:$TEST3 << EOF
+#!/bin/bash
+grep -a '<<<' ${LOG_FILE}*  > summary.log
+EOF
+
+exit
diff --git a/reg_tests/grid_gen/driver.s4.sh b/reg_tests/grid_gen/driver.s4.sh
new file mode 100755
index 000000000..190c22c9c
--- /dev/null
+++ b/reg_tests/grid_gen/driver.s4.sh
@@ -0,0 +1,109 @@
+#!/bin/bash
+
+#-----------------------------------------------------------------------------
+#
+# Run grid generation consistency tests on S4.
+#
+# Set WORK_DIR to your working directory. Set the PROJECT_CODE and QUEUE
+# as appropriate.  To see which projects you are authorized to use,
+# type
+# "sacctmgr show assoc Users=<USERNAME> format=account,user,qos"
+#
+# Invoke the script with no arguments.  A series of daily-
+# chained jobs will be submitted.  To check the queue, type:
+# "squeue -u USERNAME".
+#
+# Log output from the suite will be in LOG_FILE.  Once the suite
+# has completed, a summary is placed in SUM_FILE.
+#
+# A test fails when its output does not match the baseline files as
+# determined by the "nccmp" utility.  The baseline files are stored in
+# HOMEreg
+#
+#-----------------------------------------------------------------------------
+
+compiler=${compiler:-"intel"}
+
+source ../../sorc/machine-setup.sh > /dev/null 2>&1
+module use ../../modulefiles
+module load build.$target.$compiler
+module list
+
+set -x
+
+export WORK_DIR="${WORK_DIR:-/scratch/short/users/$LOGNAME}"
+export WORK_DIR="${WORK_DIR}/reg-tests/grid-gen"
+QUEUE="${QUEUE:-s4}"
+PROJECT_CODE="${PROJECT_CODE:-star}"
+
+#-----------------------------------------------------------------------------
+# Should not have to change anything below here.
+#-----------------------------------------------------------------------------
+
+export UPDATE_BASELINE="FALSE"
+#export UPDATE_BASELINE="TRUE"
+
+if [ "$UPDATE_BASELINE" = "TRUE" ]; then
+  source ../get_hash.sh
+fi
+
+LOG_FILE=consistency.log
+SUM_FILE=summary.log
+export home_dir=$PWD/../..
+export APRUN=time
+export APRUN_SFC=srun
+export OMP_STACKSIZE=2048m
+export machine=S4
+export HOMEreg=/data/users/dhuber/save/nems/role.ufsutils/ufs_utils/reg_tests/grid_gen/baseline_data
+
+ulimit -a
+#ulimit -s unlimited
+
+rm -fr $WORK_DIR
+
+export OMP_NUM_THREADS=24
+
+#-----------------------------------------------------------------------------
+# C96 uniform grid
+#-----------------------------------------------------------------------------
+
+TEST1=$(sbatch --parsable --ntasks-per-node=24 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.uniform \
+      -o $LOG_FILE -e $LOG_FILE ./c96.uniform.sh)
+
+#-----------------------------------------------------------------------------
+# C96 uniform grid using viirs vegetation data.
+#-----------------------------------------------------------------------------
+
+TEST2=$(sbatch --parsable --ntasks-per-node=24 --nodes=1 -t 0:15:00 -A $PROJECT_CODE -q $QUEUE -J c96.viirs.vegt \
+      -o $LOG_FILE -e $LOG_FILE -d afterok:$TEST1 ./c96.viirs.vegt.sh)
+
+#-----------------------------------------------------------------------------
+# gfdl regional grid
+#-----------------------------------------------------------------------------
+
+TEST3=$(sbatch --parsable --ntasks-per-node=24 --nodes=1 -t 0:10:00 -A $PROJECT_CODE -q $QUEUE -J gfdl.regional \
+      -o $LOG_FILE -e $LOG_FILE -d afterok:$TEST2 ./gfdl.regional.sh)
+
+#-----------------------------------------------------------------------------
+# esg regional grid
+#-----------------------------------------------------------------------------
+
+TEST4=$(sbatch --parsable --ntasks-per-node=24 --nodes=1 -t 0:10:00 -A $PROJECT_CODE -q $QUEUE -J esg.regional \
+      -o $LOG_FILE -e $LOG_FILE -d afterok:$TEST3 ./esg.regional.sh)
+
+#-----------------------------------------------------------------------------
+# Regional GSL gravity wave drag test.
+#-----------------------------------------------------------------------------
+
+TEST5=$(sbatch --parsable --ntasks-per-node=24 --nodes=1 -t 0:10:00 -A $PROJECT_CODE -q $QUEUE -J reg.gsl.gwd \
+      -o $LOG_FILE -e $LOG_FILE -d afterok:$TEST4 ./regional.gsl.gwd.sh)
+
+#-----------------------------------------------------------------------------
+# Create summary log.
+#-----------------------------------------------------------------------------
+
+sbatch --nodes=1 -t 0:01:00 -A $PROJECT_CODE -J grid_summary -o $LOG_FILE -e $LOG_FILE \
+       --open-mode=append -q $QUEUE -d afterok:$TEST5 << EOF
+#!/bin/bash
+grep -a '<<<' $LOG_FILE  > $SUM_FILE
+EOF
diff --git a/reg_tests/ice_blend/driver.s4.sh b/reg_tests/ice_blend/driver.s4.sh
new file mode 100755
index 000000000..7aee14a02
--- /dev/null
+++ b/reg_tests/ice_blend/driver.s4.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+
+#-----------------------------------------------------------------------------
+#
+# Run ice_blend consistency test on S4.
+#
+# Set $DATA to your working directory.  Set the project code (SBATCH -A)
+# and queue (SBATCH -q) as appropriate.
+#
+# Invoke the script as follows:  sbatch $script
+#
+# Log output is placed in consistency.log.  A summary is
+# placed in summary.log
+#
+# The test fails when its output does not match the baseline file
+# as determined by the 'cmp' command.  The baseline file is
+# stored in HOMEreg.
+#
+#-----------------------------------------------------------------------------
+
+#SBATCH -J ice_blend
+#SBATCH -A s4
+#SBATCH --open-mode=truncate
+#SBATCH -o consistency.log
+#SBATCH -e consistency.log
+#SBATCH --ntasks=1
+#SBATCH -q s4
+#SBATCH -t 00:03:00
+
+set -x
+
+compiler=${compiler:-"intel"}
+
+source ../../sorc/machine-setup.sh > /dev/null 2>&1
+module use ../../modulefiles
+module load build.$target.$compiler
+module list
+
+export DATA="${WORK_DIR:-/scratch/short/users/$LOGNAME}"
+export DATA="${DATA}/reg-tests/ice-blend"
+
+#-----------------------------------------------------------------------------
+# Should not have to change anything below.
+#-----------------------------------------------------------------------------
+
+export UPDATE_BASELINE="FALSE"
+#export UPDATE_BASELINE="TRUE"
+
+if [ "$UPDATE_BASELINE" = "TRUE" ]; then
+  source ../get_hash.sh
+fi
+
+export WGRIB=/data/prod/hpc-stack/intel-2022.1/grib_util/1.2.2/bin/wgrib
+export WGRIB2=/data/prod/hpc-stack/intel-2022.1/wgrib2/2.0.8/bin/wgrib2
+export COPYGB=/data/prod/hpc-stack/intel-2022.1/grib_util/1.2.2/bin/copygb
+export COPYGB2=/data/prod/hpc-stack/intel-2022.1/grib_util/1.2.2/bin/copygb2
+export CNVGRIB=/data/prod/hpc-stack/intel-2022.1/grib_util/1.2.2/bin/cnvgrib
+
+export HOMEreg=/data/users/dhuber/save/nems/role.ufsutils/ufs_utils/reg_tests/ice_blend
+export HOMEgfs=$PWD/../..
+
+rm -fr $DATA
+
+./ice_blend.sh
+
+exit 0
diff --git a/reg_tests/rt.sh b/reg_tests/rt.sh
index bf196f576..b16d98c07 100755
--- a/reg_tests/rt.sh
+++ b/reg_tests/rt.sh
@@ -91,7 +91,7 @@ fi
 
 for dir in ice_blend; do
     cd $dir
-    if [[ $target == "hera" ]] || [[ $target == "jet" ]] || [[ $target == "orion" ]]; then
+    if [[ $target == "hera" ]] || [[ $target == "jet" ]] || [[ $target == "orion" ]] || [[ $target == "s4" ]] ; then
         sbatch -A ${PROJECT_CODE} ./driver.$target.sh
     elif [[ $target == "wcoss_dell_p3" ]] || [[ $target == "wcoss_cray" ]]; then
         cat ./driver.$target.sh | bsub -P ${PROJECT_CODE}
diff --git a/reg_tests/snow2mdl/driver.s4.sh b/reg_tests/snow2mdl/driver.s4.sh
new file mode 100755
index 000000000..608a19584
--- /dev/null
+++ b/reg_tests/snow2mdl/driver.s4.sh
@@ -0,0 +1,72 @@
+#!/bin/bash
+
+#-----------------------------------------------------------------------------
+#
+# Run snow2mdl consistency test on S4.
+#
+# Set $DATA_ROOT to your working directory.  Set the project code
+# and queue as appropriate.
+#
+# Invoke the script as follows:  ./$script
+#
+# Log output is placed in consistency.log.  A summary is
+# placed in summary.log
+#
+# The test fails when its output does not match the baseline file
+# as determined by the 'cmp' command.  The baseline file is
+# stored in HOMEreg.
+#
+#-----------------------------------------------------------------------------
+
+set -x
+
+compiler=${compiler:-"intel"}
+
+source ../../sorc/machine-setup.sh > /dev/null 2>&1
+module use ../../modulefiles
+module load build.$target.$compiler
+module list
+
+DATA_ROOT="${WORK_DIR:-/scratch/short/users/$LOGNAME}"
+DATA_ROOT="${DATA_ROOT}/reg-tests/snow2mdl"
+
+PROJECT_CODE="${PROJECT_CODE:-star}"
+QUEUE="${QUEUE:-s4}"
+
+#-----------------------------------------------------------------------------
+# Should not have to change anything below.
+#-----------------------------------------------------------------------------
+
+export UPDATE_BASELINE="FALSE"
+#export UPDATE_BASELINE="TRUE"
+
+if [ "$UPDATE_BASELINE" = "TRUE" ]; then
+  source ../get_hash.sh
+fi
+
+export HOMEreg=/data/users/dhuber/save/nems/role.ufsutils/ufs_utils/reg_tests/snow2mdl
+export HOMEgfs=$PWD/../..
+export WGRIB=/data/prod/hpc-stack/intel-2022.1/grib_util/1.2.2/bin/wgrib
+export WGRIB2=/data/prod/hpc-stack/intel-2022.1/wgrib2/2.0.8/bin/wgrib2
+
+# The first test mimics GFS OPS.
+
+export DATA="${DATA_ROOT}/test.ops"
+TEST1=$(sbatch --parsable -J snow.ops -A ${PROJECT_CODE} -o consistency.log -e consistency.log \
+      --ntasks=1 -q ${QUEUE} -t 00:03:00 ./snow2mdl.ops.sh)
+
+# The second test is for the new AFWA global GRIB2 data.
+
+export DATA="${DATA_ROOT}/test.global"
+TEST2=$(sbatch --parsable -J snow.global -A ${PROJECT_CODE} -o consistency.log -e consistency.log \
+      --ntasks=1 -q ${QUEUE} -t 00:03:00 -d afterok:$TEST1 ./snow2mdl.global.sh)
+
+# Create summary file.
+
+sbatch --nodes=1 -t 0:01:00 -A ${PROJECT_CODE} -J snow_summary -o consistency.log -e consistency.log \
+       --open-mode=append -q ${QUEUE} -d afterok:$TEST2 << EOF
+#!/bin/bash
+grep -a '<<<' consistency.log  > summary.log
+EOF
+
+exit 0