diff --git a/.gitmodules b/.gitmodules
index 5ece87098e..d234c658cb 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,7 +1,7 @@
 [submodule "FV3"]
   path = FV3
-  url = https://github.com/NOAA-EMC/fv3atm
-  branch = develop
+  url = https://github.com/ywangwof/fv3atm
+  branch = feature/HAILCAST
 [submodule "WW3"]
   path = WW3
   url = https://github.com/NOAA-EMC/WW3
diff --git a/FV3 b/FV3
index 8a58e19da1..ae3c977cda 160000
--- a/FV3
+++ b/FV3
@@ -1 +1 @@
-Subproject commit 8a58e19da17ec02569b833536597f38aac937d66
+Subproject commit ae3c977cda92bd92e4a48bcf6f686abb15777384