diff --git a/.gitmodules b/.gitmodules
index 7a95f042f..92e06008c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "Submodules/RRTMGP"]
 	path = Submodules/RRTMGP
 	url = https://github.com/E3SM-Project/rte-rrtmgp
+[submodule "Submodules/WW3"]
+	path = Submodules/WW3
+	url = https://github.com/erf-model/WW3
diff --git a/Submodules/WW3 b/Submodules/WW3
new file mode 160000
index 000000000..f5fa58228
--- /dev/null
+++ b/Submodules/WW3
@@ -0,0 +1 @@
+Subproject commit f5fa5822849e33976cdc935a91b304c60bc2a976