diff --git a/Externals.cfg b/Externals.cfg
index 79ef73091b..9a3ba1fea5 100644
--- a/Externals.cfg
+++ b/Externals.cfg
@@ -27,10 +27,12 @@ required = True
 
 [EMC_post]
 protocol = git
-repo_url = https://github.com/NOAA-GSL/EMC_post
+repo_url = https://github.com/NOAA-EMC/EMC_post        
+# provisional only
 # Specify either a branch name or a hash but not both.
-#branch = RRFS_dev
-hash = 6ec6c91
+branch = develop                                       
+# provisional only
+#hash = 6ec6c91
 local_path = src/EMC_post
 required = True
 
diff --git a/README.md b/README.md
index 495616cf67..eb799572ef 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,16 @@ Building need be done only once if no source code is changed.
     source /etc/profile.d/modules.sh
     source env/build_jet_intel.env
 ```
+- If building for the 3-km North America domain, enable 32-bit dynamics, otherwise skip 
+this step.  This selection is made at compile time by editing
+```
+    vi src/ufs_weather_model/CMakeLists.txt
+```
+   and then locating this line:
+```
+    set(32BIT           OFF  CACHE BOOL "Enable 32BIT (single precision arithmetic in dycore)")
+```
+   where "OFF" should be changed to "ON". 
 - Build the code for UFS_UTILS, ufs_weather_model, and UPP only(from top level SRW App).
 ```
     mkdir build