diff --git a/etc/lmod-setup.sh b/etc/lmod-setup.sh
index 324868afce..c969778c12 100644
--- a/etc/lmod-setup.sh
+++ b/etc/lmod-setup.sh
@@ -31,7 +31,7 @@ if [ "$L_MACHINE" = macos ]; then
    module purge
 
 elif [ "$L_MACHINE" = linux ]; then
-   export BASH_ENV="/usr/share/share/lmod/init/bash"
+   export BASH_ENV="/usr/share/lmod/lmod/init/bash"
    source $BASH_ENV
 
    module purge
diff --git a/modulefiles/build_linux_gnu.lua b/modulefiles/build_linux_gnu.lua
index 7f40d763de..cc5f6831f1 100644
--- a/modulefiles/build_linux_gnu.lua
+++ b/modulefiles/build_linux_gnu.lua
@@ -14,7 +14,6 @@ load("hpc")
 load("hpc-python")
 
 load("hpc-gnu")
-load("openmpi")
 load("hpc-openmpi")
 
 load("srw_common")
diff --git a/modulefiles/build_macos_gnu.lua b/modulefiles/build_macos_gnu.lua
index d92de9a4da..36c8b80cdb 100644
--- a/modulefiles/build_macos_gnu.lua
+++ b/modulefiles/build_macos_gnu.lua
@@ -18,7 +18,6 @@ load("hpc")
 load("hpc-python")
 
 load("hpc-gnu")
-load("openmpi")
 load("hpc-openmpi")
 
 load("srw_common")
diff --git a/modulefiles/wflow_linux.lua b/modulefiles/wflow_linux.lua
index dd9aec7afa..6c4cc6949d 100644
--- a/modulefiles/wflow_linux.lua
+++ b/modulefiles/wflow_linux.lua
@@ -5,16 +5,35 @@ This module sets a path to activate conda environment needed for running the UFS
 whatis([===[This module sets a path for conda environment needed for running the UFS SRW App on Linux]===])
 
 setenv("CMAKE_Platform", "linux")
-setenv("VENV", pathJoin(os.getenv("HOME"), "condaenv/envs/regional_workflow"))
 
---[[
-local ROCOTOmod="/Users/username/modules"
-prepend_path("MODULEPATH", ROCOTOmod)
-load(rocoto)
---]]
+-- Conda initialization function
+function init_conda(conda_path)
+    local shell=myShellType()
+    local conda_file
+    if shell == "csh" then
+      conda_file=pathJoin(conda_path,"etc/profile.d/conda.csh")
+    else
+      conda_file=pathJoin(conda_path,"etc/profile.d/conda.sh")
+    end
+    local mcmd="source " .. conda_file
+    execute{cmd=mcmd, modeA={"load"}}
+end
+
+-- initialize conda
+local conda_path="/home/username/miniconda3"
+init_conda(conda_path)
+
+-- add rocoto to path
+local rocoto_path="/home/username/rocoto"
+prepend_path("PATH", pathJoin(rocoto_path,"bin"))
+
+-- add fake slurm commands
+local srw_path="/home/username/ufs-srweather-app"
+prepend_path("PATH", pathJoin(srw_path, "ush/rocoto_fake_slurm"))
 
+-- display conda activation message
 if mode() == "load" then
      LmodMsgRaw([===[Please do the following to activate conda:
-       > conda activate $VENV
+       > conda activate regional_workflow
 ]===])
 end
diff --git a/modulefiles/wflow_macos.lua b/modulefiles/wflow_macos.lua
index 769f1bc05e..d7cf30e0a3 100644
--- a/modulefiles/wflow_macos.lua
+++ b/modulefiles/wflow_macos.lua
@@ -5,17 +5,36 @@ This module set a path needed to activate conda environement for running UFS SRW
 whatis([===[This module activates conda environment for running the UFS SRW App on macOS]===])
 
 setenv("CMAKE_Platform", "macos")
-setenv("VENV", pathJoin(os.getenv("HOME"), "condaenv/envs/regional_workflow"))
 
---[[
-local ROCOTOmod="/Users/username/modules"
-prepend_path("MODULEPATH", ROCOTOmod)
-load(rocoto)
---]]
+-- Conda initialization function
+function init_conda(conda_path)
+    local shell=myShellType()
+    local conda_file
+    if shell == "csh" then
+      conda_file=pathJoin(conda_path,"etc/profile.d/conda.csh")
+    else
+      conda_file=pathJoin(conda_path,"etc/profile.d/conda.sh")
+    end
+    local mcmd="source " .. conda_file
+    execute{cmd=mcmd, modeA={"load"}}
+end
+
+-- initialize conda
+local conda_path="/Users/username/miniconda3"
+init_conda(conda_path)
+
+-- add rocoto to path
+local rocoto_path="/Users/username/rocoto"
+prepend_path("PATH", pathJoin(rocoto_path,"bin"))
+
+-- add fake slurm commands
+local srw_path="/Users/username/ufs-srweather-app"
+prepend_path("PATH", pathJoin(srw_path, "ush/rocoto_fake_slurm"))
 
+-- display conda activation message
 if mode() == "load" then
    LmodMsgRaw([===[Please do the following to activate conda virtual environment:
-       > conda activate $VENV "
+       > conda activate regional_workflow"
 ]===])
 end
 
diff --git a/parm/FV3LAM_wflow.xml b/parm/FV3LAM_wflow.xml
index d46e70dee1..fda2b630c7 100644
--- a/parm/FV3LAM_wflow.xml
+++ b/parm/FV3LAM_wflow.xml
@@ -153,7 +153,7 @@ tasks; and the "FCST" type is used for the RUN_FCST_TN task.
 
 ]>
 
-<workflow realtime="F" scheduler="&SCHED;" cyclethrottle="20">
+<workflow realtime="F" scheduler="&SCHED;" cyclethrottle="20" taskthrottle="{{ taskthrottle }}">
 {# Double quotes are required inside the strftime! Expect an error from reading the template if using single quotes. #}
   <cycledef group="at_start">{{ cdate_first_cycl.strftime("%M %H %d %m %Y *") }}</cycledef>
   <cycledef group="forecast">
diff --git a/tests/WE2E/test_configs/wflow_features/config.get_from_NOMADS_ics_FV3GFS_lbcs_FV3GFS.yaml b/tests/WE2E/test_configs/wflow_features/config.get_from_NOMADS_ics_FV3GFS_lbcs_FV3GFS.yaml
index 7b30698ef2..38fbbe5af6 100644
--- a/tests/WE2E/test_configs/wflow_features/config.get_from_NOMADS_ics_FV3GFS_lbcs_FV3GFS.yaml
+++ b/tests/WE2E/test_configs/wflow_features/config.get_from_NOMADS_ics_FV3GFS_lbcs_FV3GFS.yaml
@@ -10,8 +10,8 @@ platform:
 workflow:
   CCPP_PHYS_SUITE: FV3_GFS_2017_gfdlmp
   PREDEF_GRID_NAME: RRFS_CONUS_25km
-  DATE_FIRST_CYCL: date --utc --date="2 days ago" +%Y%m%d00
-  DATE_LAST_CYCL: date --utc --date="2 days ago" +%Y%m%d00
+  DATE_FIRST_CYCL: $DATE_UTIL --utc --date="2 days ago" +%Y%m%d00
+  DATE_LAST_CYCL: $DATE_UTIL --utc --date="2 days ago" +%Y%m%d00
   FCST_LEN_HRS: 6
   PREEXISTING_DIR_METHOD: rename
 task_get_extrn_ics:
diff --git a/ush/config_defaults.yaml b/ush/config_defaults.yaml
index 5baa934f43..4974e79f50 100644
--- a/ush/config_defaults.yaml
+++ b/ush/config_defaults.yaml
@@ -87,6 +87,10 @@ platform:
   # The number of cores available per node on the compute platform, now 
   # configurable for all platforms.
   #
+  # TASKTHROTTLE:
+  # The number of active tasks run simultaneously. For linux/mac setting this
+  # to 1 makes sense
+  #
   # BUILD_MOD_FN:
   # Name of alternative build module file to use if using an
   # unsupported platform. Is set automatically for supported machines.
@@ -158,6 +162,7 @@ platform:
   #
   WORKFLOW_MANAGER: ""
   NCORES_PER_NODE: ""
+  TASKTHROTTLE: 1000
   BUILD_MOD_FN: 'build_{{ user.MACHINE|lower() }}_{{ workflow.COMPILER }}'
   WFLOW_MOD_FN: 'wflow_{{ user.MACHINE|lower() }}'
   BUILD_VER_FN: 'build.ver.{{ user.MACHINE|lower() }}'
diff --git a/ush/constants.yaml b/ush/constants.yaml
index c4a3fa9d67..0ac61f5318 100644
--- a/ush/constants.yaml
+++ b/ush/constants.yaml
@@ -7,7 +7,7 @@ constants:
   #-----------------------------------------------------------------------
   #
   PI_GEOM: 3.14159265358979323846264338327
-  DEGS_PER_RADIAN: 57.2957795131
+  DEGS_PER_RADIAN: 57.29577951308232087679
   RADIUS_EARTH: 6371200.0
   #
   #-----------------------------------------------------------------------
diff --git a/ush/machine/linux.yaml b/ush/machine/linux.yaml
index db9749aa73..14dafe0e45 100644
--- a/ush/machine/linux.yaml
+++ b/ush/machine/linux.yaml
@@ -1,18 +1,31 @@
 platform:
-  WORKFLOW_MANAGER: none
+  WORKFLOW_MANAGER: rocoto
   NCORES_PER_NODE: 8
-  SCHED: none
-  RUN_CMD_FCST: 'mpirun -n ${PE_MEMBER01} '
-  RUN_CMD_POST: 'mpirun -n 4 '
+  TASKTHROTTLE: 1
+  SCHED: slurm
+  CCPA_OBS_DIR: /home/username/DATA/UFS/obs_data/ccpa/proc
+  MRMS_OBS_DIR: /home/username/DATA/UFS/obs_data/mrms/proc
+  NDAS_OBS_DIR: /home/username/DATA/UFS/obs_data/ndas/proc
+  METPLUS_PATH: ""
+  MET_BIN_EXEC: bin
+  MET_INSTALL_DIR: ""
+  DOMAIN_PREGEN_BASEDIR: /home/username/DATA/UFS/FV3LAM_pregen
+  RUN_CMD_FCST: mpirun -n ${PE_MEMBER01}
+  RUN_CMD_POST: mpirun
   RUN_CMD_SERIAL: time
-  RUN_CMD_UTILS: mpirun -n 4
-  PRE_TASK_CMDS: '{ ulimit -a; }'
+  RUN_CMD_UTILS: mpirun
+  PRE_TASK_CMDS: '{ ulimit -a; ulimit -s unlimited; }'
+  TEST_EXTRN_MDL_SOURCE_BASEDIR: /home/username/DATA/UFS/input_model_data
+  TEST_PREGEN_BASEDIR: /home/username/DATA/UFS/FV3LAM_pregen
+  TEST_ALT_EXTRN_MDL_SYSBASEDIR_ICS: /home/username/DATA/UFS/dummy_FV3GFS_sys_dir
+  TEST_ALT_EXTRN_MDL_SYSBASEDIR_LBCS: /home/username/DATA/UFS/dummy_FV3GFS_sys_dir
   FIXaer: /home/username/DATA/UFS/fix/fix_aer
   FIXgsm: /home/username/DATA/UFS/fix/fix_am
   FIXlut: /home/username/DATA/UFS/fix/fix_lut
   FIXorg: /home/username/DATA/UFS/fix/fix_orog
   FIXsfc: /home/username/DATA/UFS/fix/fix_sfc_climo
   FIXshp: /home/username/DATA/UFS/NaturalEarth
+  EXTRN_MDL_DATA_STORES: aws nomads
 data:
   ics_lbcs:
     FV3GFS: /home/username/DATA/UFS/FV3GFS
diff --git a/ush/machine/macos.yaml b/ush/machine/macos.yaml
index 7d16746174..3cca8ecc4c 100644
--- a/ush/machine/macos.yaml
+++ b/ush/machine/macos.yaml
@@ -1,18 +1,31 @@
 platform:
-  WORKFLOW_MANAGER: none
+  WORKFLOW_MANAGER: rocoto
   NCORES_PER_NODE: 8
-  SCHED: none
-  RUN_CMD_FCST: 'mpirun -n ${PE_MEMBER01} '
-  RUN_CMD_POST: 'mpirun -n 4 '
+  TASKTHROTTLE: 1
+  SCHED: slurm
+  CCPA_OBS_DIR: /Users/username/DATA/UFS/obs_data/ccpa/proc
+  MRMS_OBS_DIR: /Users/username/DATA/UFS/obs_data/mrms/proc
+  NDAS_OBS_DIR: /Users/username/DATA/UFS/obs_data/ndas/proc
+  DOMAIN_PREGEN_BASEDIR: /Users/username/DATA/UFS/FV3LAM_pregen
+  METPLUS_PATH: ""
+  MET_BIN_EXEC: bin
+  MET_INSTALL_DIR: ""
+  RUN_CMD_FCST: mpirun -n ${PE_MEMBER01}
+  RUN_CMD_POST: mpirun
   RUN_CMD_SERIAL: time
-  RUN_CMD_UTILS: mpirun -n 4
-  PRE_TASK_CMDS: '{ ulimit -a; }'
+  RUN_CMD_UTILS: mpirun
+  PRE_TASK_CMDS: '{ ulimit -a; ulimit -s unlimited; }'
+  TEST_EXTRN_MDL_SOURCE_BASEDIR: /Users/username/DATA/UFS/input_model_data
+  TEST_PREGEN_BASEDIR: /Users/username/DATA/UFS/FV3LAM_pregen
+  TEST_ALT_EXTRN_MDL_SYSBASEDIR_ICS: /Users/username/DATA/UFS/dummy_FV3GFS_sys_dir
+  TEST_ALT_EXTRN_MDL_SYSBASEDIR_LBCS: /Users/username/DATA/UFS/dummy_FV3GFS_sys_dir
   FIXaer: /Users/username/DATA/UFS/fix/fix_aer
   FIXgsm: /Users/username/DATA/UFS/fix/fix_am
   FIXlut: /Users/username/DATA/UFS/fix/fix_lut
   FIXorg: /Users/username/DATA/UFS/fix/fix_orog
   FIXsfc: /Users/username/DATA/UFS/fix/fix_sfc_climo
   FIXshp: /Users/username/DATA/UFS/NaturalEarth
+  EXTRN_MDL_DATA_STORES: aws nomads
 data:
   ics_lbcs:
     FV3GFS: /Users/username/DATA/UFS/FV3GFS
diff --git a/ush/python_utils/config_parser.py b/ush/python_utils/config_parser.py
index aa9d04aed3..c09ff8c9c5 100644
--- a/ush/python_utils/config_parser.py
+++ b/ush/python_utils/config_parser.py
@@ -26,7 +26,7 @@
 except ModuleNotFoundError:
     pass
 # The rest of the formats: JSON/SHELL/INI/XML do not need
-# external pakcages
+# external packages
 import json
 import os
 import re
@@ -398,8 +398,6 @@ def cfg_to_xml_str(cfg):
 ##################
 # CONFIG utils
 ##################
-
-
 def flatten_dict(dictionary, keys=None):
     """Flatten a recursive dictionary (e.g.yaml/json) to be one level deep
 
diff --git a/ush/rocoto_fake_slurm/sacct b/ush/rocoto_fake_slurm/sacct
new file mode 100755
index 0000000000..7b07f84720
--- /dev/null
+++ b/ush/rocoto_fake_slurm/sacct
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# Emulates slurm's sacct
+if [[ "$1" = "--jobs="* ]]; then
+  PIDS="${1:7}"
+  PIDS="${PIDS//,/' '}"
+elif [[ -f .job_database ]]; then
+  PIDS=$(cat .job_database | grep submitted | sort -u -k1,1 |  awk '{print $3}')
+fi
+
+# Output info the way rocoto calls sacct
+FMT="%s|%s|%s|%s|%s|%s|%s|%s|%s|%s|%s\n"
+echo "JobID|User|JobName|Partition|Priority|Submit|Start|End|NCPUS|ExitCode|State"
+
+for pid in ${PIDS}; do
+
+   t_sub="N/A"
+   t_start=$t_sub
+   t_end=$t_sub
+   name=$pid
+   user=${USER:-user}
+   exitc=0
+   state="UNKNOWN"
+
+   v=$(cat .job_database | grep "pid $pid submitted" | awk '{print $1" "$5}')
+   if [ ! -z "$v" ]; then
+      state="PENDING"
+      read name t_sub <<< "$v"
+      v=$(cat .job_database | grep "pid $pid started" | awk '{print $5" "$7}')
+      if [ ! -z "$v" ]; then
+         state="RUNNING"
+         read t_start t_end<<< "$v"
+      fi
+      v=$(cat .job_database | grep "pid $pid ended" | awk '{print $5" "$7}')
+      if [ ! -z "$v" ]; then
+         state="COMPLETED"
+         read t_end exitc <<< "$v"
+      fi
+   fi
+
+   printf "$FMT" $pid ${user:0:30} ${name:0:30} linux 0.1 $t_sub $t_start $t_end 1 $exitc $state 
+done
diff --git a/ush/rocoto_fake_slurm/sbatch b/ush/rocoto_fake_slurm/sbatch
new file mode 100755
index 0000000000..b505c8ab9d
--- /dev/null
+++ b/ush/rocoto_fake_slurm/sbatch
@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Emulates slurm's sbatch
+
+FD=${1:-/dev/stdin}
+
+#parse log file
+LOG=`grep "#SBATCH -o" $FD | awk '{ print $3 }'`
+if [ -z "$LOG" ]; then
+   LOG=/dev/null
+fi
+
+#parse time
+TIM=`grep "#SBATCH -t" $FD | awk '{ print $3 }'`
+if [ -z "$TIM" ]; then
+   SECS=
+   CTIM=
+else
+   SECS=`echo $TIM | awk 'BEGIN { FS = ":" } ; { secs = $1 * 3600 + $2 * 60 + $3; print secs };'`
+   CTIM="timeout ${SECS}s"
+fi
+
+#parse job name
+JOBNAME=`grep "#SBATCH --job-name" $FD | awk 'BEGIN { FS = "=" }; { print $2 }'`
+if [ -z "$JOBNAME" ]; then
+   JOBNAME="default"
+fi
+
+#command
+CMD="`cat $FD`"
+
+#execute job in background
+bash -c "\
+   ds=\$(date --utc +%Y-%m-%d:%H:%M:%S); \
+   de=\$(date --utc -d '$SECS sec' +%Y-%m-%d:%H:%M:%S); \
+   echo $JOBNAME pid \$$ started \$ds ends \$de >>.job_database; \
+   \
+   ${CTIM} ${CMD} &>$LOG; \
+   excode=\$?; \
+   \
+   de=\$(date --utc +%Y-%m-%d:%H:%M:%S); \
+   echo $JOBNAME pid \$$ ended \$de exitcode \$excode >>.job_database;" &
+
+#submission info
+pid=$!
+dsub=$(date --utc +%Y-%m-%d:%H:%M:%S)
+echo $JOBNAME pid $pid submitted $dsub >>.job_database
+echo "Submitted batch job "$pid
diff --git a/ush/rocoto_fake_slurm/scancel b/ush/rocoto_fake_slurm/scancel
new file mode 100755
index 0000000000..94575f48c3
--- /dev/null
+++ b/ush/rocoto_fake_slurm/scancel
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# Emulates slurm's scancel
+exec kill -9 -$1
diff --git a/ush/rocoto_fake_slurm/sinfo b/ush/rocoto_fake_slurm/sinfo
new file mode 100755
index 0000000000..cde2d07bc7
--- /dev/null
+++ b/ush/rocoto_fake_slurm/sinfo
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# Emulates slurm's sinfo
+exec lscpu
diff --git a/ush/rocoto_fake_slurm/squeue b/ush/rocoto_fake_slurm/squeue
new file mode 100755
index 0000000000..915ca58506
--- /dev/null
+++ b/ush/rocoto_fake_slurm/squeue
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# Emulates slurm's squeue
+if [[ "$1" = "--jobs="* ]]; then
+  PIDS="${1:7}"
+  PIDS="${PIDS//,/' '}"
+elif [[ -f .job_database ]]; then
+  PIDS=$(cat .job_database | grep submitted | sort -u -k1,1 |  awk '{print $3}')
+fi
+
+# Output info the way rocoto calls squeue
+FMT="%-40s%-40s%-10s%-20s%-30s%-30s%-30s%-30s%-10s%-30s%-200s\n"
+printf "$FMT" JOBID USER CPUS PARTITION SUBMIT_TIME START_TIME END_TIME PRIORITY EXIT_CODE STATE NAME
+
+for pid in ${PIDS}; do
+
+   t_sub="N/A"
+   t_start=$t_sub
+   t_end=$t_sub
+   name=$pid
+   user=${USER:-user}
+   exitc=0
+   state="UNKNOWN"
+
+   v=$(cat .job_database | grep "pid $pid submitted" | awk '{print $1" "$5}')
+   if [ ! -z "$v" ]; then
+      state="PENDING"
+      read name t_sub <<< "$v"
+      v=$(cat .job_database | grep "pid $pid started" | awk '{print $5" "$7}')
+      if [ ! -z "$v" ]; then
+         state="RUNNING"
+         read t_start t_end<<< "$v"
+      fi
+      v=$(cat .job_database | grep "pid $pid ended" | awk '{print $5" "$7}')
+      if [ ! -z "$v" ]; then
+         state="COMPLETED"
+         read t_end exitc <<< "$v"
+      fi
+   fi
+
+   printf "$FMT" $pid $user 1 linux $t_sub $t_start $t_end 0.1 $exitc $state $name
+done
diff --git a/ush/rocoto_fake_slurm/srun b/ush/rocoto_fake_slurm/srun
new file mode 100755
index 0000000000..b5387a3d2d
--- /dev/null
+++ b/ush/rocoto_fake_slurm/srun
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# Emulates slurm's srun
+OPTS=""
+CMDS=""
+
+# Extract only --ntasks from options
+while (( "$#" )); do
+  case "$1" in
+     -n|--ntasks)
+       OPTS="$OPTS -n $2"
+       shift 2
+       ;;
+     --ntasks=?*)
+       OPTS="$OPTS -n ${1:9}"
+       shift 1
+       ;;
+     *)
+       CMDS="$CMDS $1"
+       shift
+       ;;
+  esac
+done
+
+# Run with mpirun
+exec mpirun ${OPTS} ${CMDS}
diff --git a/ush/set_gridparams_ESGgrid.py b/ush/set_gridparams_ESGgrid.py
index 3346fe0bfd..cf8ddb9ff8 100644
--- a/ush/set_gridparams_ESGgrid.py
+++ b/ush/set_gridparams_ESGgrid.py
@@ -90,7 +90,7 @@ def test_set_gridparams_ESGgrid(self):
             dely=3000.0,
             constants=dict(
                 RADIUS_EARTH=6371200.0,
-                DEGS_PER_RADIAN=57.2957795131,
+                DEGS_PER_RADIAN=57.29577951308232087679,
             ),
         )
 
@@ -104,8 +104,8 @@ def test_set_gridparams_ESGgrid(self):
                 0.0,
                 6,
                 0.999,
-                0.013489400626200717,
-                0.013489400626200717,
+                0.013489400626196555,
+                0.013489400626196555,
                 -1760,
                 -1050,
             ],