diff --git a/repos/spack_repo/builtin/packages/erf/package.py b/repos/spack_repo/builtin/packages/erf/package.py
index 8388c7ec22a..1482239127a 100644
--- a/repos/spack_repo/builtin/packages/erf/package.py
+++ b/repos/spack_repo/builtin/packages/erf/package.py
@@ -4,6 +4,15 @@
 from spack.package import *
 
 
+def submodules(package):
+    submodules = []
+
+    if package.spec.satisfies("+noahmp"):
+        submodules.append("Submodules/Noah-MP")
+
+    return submodules
+
+
 class Erf(CMakePackage, CudaPackage):
     """ERF solves the compressible Navier-Stokes on a Arakawa C-grid
     for large-scale weather modeling.
@@ -22,29 +31,29 @@ def url_for_version(self, v):
 
     license("BSD-3-Clause", checked_by="larenspear")
 
-    version("25.12", tag="25.12")
-    version("25.11", tag="25.11")
-    version("25.10", tag="25.10")
-    version("25.08", tag="25.08")
-    version("25.07", tag="25.07")
-    version("25.06", tag="25.06")
-    version("25.05", tag="25.05")
-    version("25.04", tag="25.04")
-    version("25.03", tag="25.03")
-    version("25.01", tag="25.01")
-    version("24.11", tag="24.11")
-    version("24.10", tag="24.10")
-    version("24.09", tag="24.09")
-    version("24.08", tag="24.08")
-    version("24.06", tag="24.06")
-    version("24.05", tag="24.05")
-    version("24.04", tag="24.04")
-    version("24.03", tag="24.03")
-    version("24.02", tag="24.02")
-    version("24.01", tag="24.01")
-    version("23.12", tag="23.12")
-    version("23.11", tag="23.11")
-    version("23.10", tag="23.10")
+    version("25.12", tag="25.12", submodules=submodules)
+    version("25.11", tag="25.11", submodules=submodules)
+    version("25.10", tag="25.10", submodules=submodules)
+    version("25.08", tag="25.08", submodules=submodules)
+    version("25.07", tag="25.07", submodules=submodules)
+    version("25.06", tag="25.06", submodules=submodules)
+    version("25.05", tag="25.05", submodules=submodules)
+    version("25.04", tag="25.04", submodules=submodules)
+    version("25.03", tag="25.03", submodules=submodules)
+    version("25.01", tag="25.01", submodules=submodules)
+    version("24.11", tag="24.11", submodules=submodules)
+    version("24.10", tag="24.10", submodules=submodules)
+    version("24.09", tag="24.09", submodules=submodules)
+    version("24.08", tag="24.08", submodules=submodules)
+    version("24.06", tag="24.06", submodules=submodules)
+    version("24.05", tag="24.05", submodules=submodules)
+    version("24.04", tag="24.04", submodules=submodules)
+    version("24.03", tag="24.03", submodules=submodules)
+    version("24.02", tag="24.02", submodules=submodules)
+    version("24.01", tag="24.01", submodules=submodules)
+    version("23.12", tag="23.12", submodules=submodules)
+    version("23.11", tag="23.11", submodules=submodules)
+    version("23.10", tag="23.10", submodules=submodules)
 
     variant("mpi", default=False, description="Enable MPI support")
     variant("openmp", default=False, description="Enable OpenMP support")
@@ -54,6 +63,7 @@ def url_for_version(self, v):
     variant("tests", default=False, description="Enable tests")
     variant("fcompare", default=False, description="Enable fcompare")
     variant("fft", default=False, description="Enable FFT support")
+    variant("noahmp", default=False, description="Enable Noah-MP")
 
     with default_args(type="build"):
         depends_on("cmake@3.20:")
@@ -92,6 +102,8 @@ def cmake_args(self):
             self.define_from_variant("ERF_BUILD_TESTS", "tests"),
             self.define_from_variant("ERF_BUILD_FCOMPARE", "fcompare"),
             self.define_from_variant("ERF_ENABLE_FFT", "fft"),
+            self.define_from_variant("ERF_ENABLE_NOAHMP", "noahmp"),
+            self.define("ERF_DIM", "3"),
             self.define("ERF_USE_INTERNAL_AMREX", False),
             self.define("ERF_CLONE_AMREX", False),
             self.define("GIT_SUBMODULE_PROTOCOL", "https"),