diff --git a/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml b/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
index 1414ffc777de..dae389240fde 100644
--- a/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
+++ b/components/mpas-seaice/bld/namelist_files/namelist_defaults_mpassi.xml
@@ -25,6 +25,8 @@
 <config_dt ice_grid="SOwISC12to60E2r4">1800.0</config_dt>
 <config_dt ice_grid="ECwISC30to60E2r1">1800.0</config_dt>
 <config_dt ice_grid="IcoswISC30E3r5">1800.0</config_dt>
+<config_dt ice_grid="NARRM14to30E3r1">1800.0</config_dt>
+<config_dt ice_grid="NARRM14to30E3r2">1800.0</config_dt>
 <config_calendar_type>'noleap'</config_calendar_type>
 <config_start_time>'2000-01-01_00:00:00'</config_start_time>
 <config_stop_time>'none'</config_stop_time>
@@ -148,6 +150,8 @@
 <config_dynamics_subcycle_number ice_grid="SOwISC12to60E2r4">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="ECwISC30to60E2r1">1</config_dynamics_subcycle_number>
 <config_dynamics_subcycle_number ice_grid="IcoswISC30E3r5">1</config_dynamics_subcycle_number>
+<config_dynamics_subcycle_number ice_grid="NARRM14to30E3r1">1</config_dynamics_subcycle_number>
+<config_dynamics_subcycle_number ice_grid="NARRM14to30E3r2">1</config_dynamics_subcycle_number>
 <config_rotate_cartesian_grid>true</config_rotate_cartesian_grid>
 <config_include_metric_terms>true</config_include_metric_terms>
 <config_elastic_subcycle_number>120</config_elastic_subcycle_number>
diff --git a/components/mpas-seaice/cime_config/buildnml b/components/mpas-seaice/cime_config/buildnml
index cbb6109018e2..93ca6d8b56a7 100755
--- a/components/mpas-seaice/cime_config/buildnml
+++ b/components/mpas-seaice/cime_config/buildnml
@@ -267,6 +267,24 @@ def buildnml(case, caseroot, compname):
                 grid_date = '20231121'
                 grid_prefix = 'mpassi.IcoswISC30E3r5.rstFromG-chrysalis'
 
+    elif ice_grid == 'NARRM14to30E3r1':
+        decomp_date = '20240227'
+        decomp_prefix = 'partitions/mpas-seaice.graph.info.'
+        grid_date = '20240227'
+        grid_prefix = 'mpassi.NARRM14to30E3r1'
+        if ice_ic_mode == 'spunup':
+            logger.warning("WARNING: The specified compset is requesting seaice ICs spunup from a G-case")
+            logger.warning("         But no file available for this grid.")
+
+    elif ice_grid == 'NARRM14to30E3r2':
+        decomp_date = '20240228'
+        decomp_prefix = 'partitions/mpas-seaice.graph.info.'
+        grid_date = '20240228'
+        grid_prefix = 'mpassi.NARRM14to30E3r2'
+        if ice_ic_mode == 'spunup':
+            logger.warning("WARNING: The specified compset is requesting seaice ICs spunup from a G-case")
+            logger.warning("         But no file available for this grid.")
+
     elif ice_grid == 'ICOS10':
         grid_date = '211015'
         grid_prefix = 'seaice.ICOS10'