diff --git a/internal_tests/pytests/pb2nc/test_pb2nc_wrapper.py b/internal_tests/pytests/pb2nc/test_pb2nc_wrapper.py
index 2b7e9ed0f..909baa88d 100644
--- a/internal_tests/pytests/pb2nc/test_pb2nc_wrapper.py
+++ b/internal_tests/pytests/pb2nc/test_pb2nc_wrapper.py
@@ -189,6 +189,12 @@ def test_find_input_files(metplus_config, offsets, offset_to_find):
              'OBS_PB2NC_WINDOW_END': '1800',
          },
          {'METPLUS_OBS_WINDOW_DICT': 'obs_window = {beg = -1800;end = 1800;}'}),
+        # test legacy PB2NC_WINDOW_[BEGIN/END]
+        ({'PB2NC_WINDOW_BEGIN': '-1800', },
+         {'METPLUS_OBS_WINDOW_DICT': 'obs_window = {beg = -1800;}'}),
+
+        ({'PB2NC_WINDOW_END': '1800', },
+         {'METPLUS_OBS_WINDOW_DICT': 'obs_window = {end = 1800;}'}),
 
         ({'PB2NC_MASK_GRID': 'FULL', },
          {'METPLUS_MASK_DICT': 'mask = {grid = "FULL";}'}),
diff --git a/metplus/util/met_config.py b/metplus/util/met_config.py
index 55e753883..2b99e5410 100644
--- a/metplus/util/met_config.py
+++ b/metplus/util/met_config.py
@@ -165,6 +165,12 @@ def add_met_config_dict(config, app_name, output_dict, dict_name, items):
                 metplus_configs.append(
                     f"OBS_{app_name}_WINDOW_{suffix}".upper()
                 )
+
+                # also add support for legacy PB2NC_WINDOW_[BEGIN/END]
+                metplus_configs.append(
+                    f"{app_name}_WINDOW_{suffix}".upper()
+                )
+
                 # also add OBS_WINDOW_[BEGIN/END]
                 metplus_configs.append(f"OBS_WINDOW_{suffix}")
 
diff --git a/metplus/wrappers/command_builder.py b/metplus/wrappers/command_builder.py
index 29214acfc..c0c7d0475 100755
--- a/metplus/wrappers/command_builder.py
+++ b/metplus/wrappers/command_builder.py
@@ -328,9 +328,11 @@ def handle_obs_window_legacy(self, c_dict):
                  ('END', 5400)]
         app = self.app_name.upper()
 
+        # check {app}_WINDOW_{edge} to support PB2NC_WINDOW_[BEGIN/END]
         for edge, default_val in edges:
             input_list = [f'OBS_{app}_WINDOW_{edge}',
                           f'{app}_OBS_WINDOW_{edge}',
+                          f'{app}_WINDOW_{edge}',
                           f'OBS_WINDOW_{edge}',
                          ]
             output_key = f'OBS_WINDOW_{edge}'