diff --git a/ccpp/data/CCPP_typedefs.F90 b/ccpp/data/CCPP_typedefs.F90
index 7d9351337..83b6d4df0 100644
--- a/ccpp/data/CCPP_typedefs.F90
+++ b/ccpp/data/CCPP_typedefs.F90
@@ -690,7 +690,7 @@ subroutine gfs_interstitial_create (Interstitial, IM, Model)
     allocate (Interstitial%sigma           (IM))
     allocate (Interstitial%sigmaf          (IM))
     allocate (Interstitial%sigmafrac       (IM,Model%levs))
-    allocate (Interstitial%sigmatot        (IM,Model%levs))
+    allocate (Interstitial%sigmatot        (IM,Model%levs+1))
     allocate (Interstitial%snowc           (IM))
     allocate (Interstitial%snohf           (IM))
     allocate (Interstitial%snowmt          (IM))
diff --git a/ccpp/data/CCPP_typedefs.meta b/ccpp/data/CCPP_typedefs.meta
index a2d1105df..37201eb08 100644
--- a/ccpp/data/CCPP_typedefs.meta
+++ b/ccpp/data/CCPP_typedefs.meta
@@ -1952,7 +1952,7 @@
   standard_name = convective_updraft_area_fraction_at_model_interfaces
   long_name = convective updraft area fraction at model interfaces
   units = frac
-  dimensions = (horizontal_loop_extent,vertical_layer_dimension)
+  dimensions = (horizontal_loop_extent,vertical_interface_dimension)
   type = real
   kind = kind_phys
 [skip_macro]
diff --git a/ccpp/physics b/ccpp/physics
index cc114f40b..8dff959bc 160000
--- a/ccpp/physics
+++ b/ccpp/physics
@@ -1 +1 @@
-Subproject commit cc114f40bef4ca8d19ccd739cbaec3fc829a607c
+Subproject commit 8dff959bc1762dc46d14c3d277e38c689fe3152d