diff --git a/src/core_atmosphere/Externals.cfg b/src/core_atmosphere/Externals.cfg
index 84dc47d1d8..748da8e229 100644
--- a/src/core_atmosphere/Externals.cfg
+++ b/src/core_atmosphere/Externals.cfg
@@ -12,5 +12,12 @@ repo_url = https://github.com/NOAA-GSL/UGWP.git
 tag = MPAS_20241223
 required = True
 
+[GSL_MP]
+local_path = ./physics_noaa/TEMPO
+protocol = git
+repo_url = https://github.com/AndersJensen-NOAA/TEMPO.git
+tag = v3.0.0_c
+required = True
+
 [externals_description]
 schema_version = 1.0.0
diff --git a/src/core_atmosphere/physics/Makefile b/src/core_atmosphere/physics/Makefile
index 75eec25931..18352d7603 100644
--- a/src/core_atmosphere/physics/Makefile
+++ b/src/core_atmosphere/physics/Makefile
@@ -6,7 +6,7 @@ endif
 
 all:
 	./../tools/manage_externals/checkout_externals --externals ./../Externals.cfg
-	$(MAKE) lookup_tables core_physics_init core_physics_mmm core_UGWP core_physics_wrf core_physics_noahmp core_physics
+	$(MAKE) lookup_tables core_physics_init core_physics_mmm core_UGWP core_physics_wrf core_physics_noahmp core_physics core_TEMPO
 
 dummy:
 	echo "****** compiling physics ******"
@@ -63,6 +63,9 @@ core_physics_mmm: core_physics_init
 core_UGWP: core_physics_init
 	(cd physics_noaa/UGWP; $(MAKE) all)
 
+core_TEMPO: core_physics_init
+	(cd physics_noaa/TEMPO; $(MAKE) -f Makefile.mpas)
+
 core_physics_wrf: core_physics_init core_physics_mmm core_UGWP
 	(cd physics_wrf; $(MAKE) all COREDEF="$(COREDEF)")
 
@@ -254,6 +257,7 @@ clean:
 	( cd physics_noahmp/src; $(MAKE) clean )
 	( cd physics_noahmp/utility; $(MAKE) clean )
 	( if [ -d physics_noaa/UGWP ]; then cd physics_noaa/UGWP; $(MAKE) clean; fi )
+	( if [ -d physics_noaa/TEMPO ]; then cd physics_noaa/TEMPO; $(MAKE) -f Makefile.mpas clean; fi )
 	@# Certain systems with intel compilers generate *.i files
 	@# This removes them during the clean process
 	$(RM) *.i