diff --git a/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf b/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf
index 5626758a5..e73e1dfd8 100644
--- a/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf
+++ b/parm/use_cases/model_applications/tc_and_extra_tc/TCDiag_fcstGFSO_SHIP_obsOFCL_SingleForecast.conf
@@ -122,6 +122,7 @@ MODEL = GFSO
 
 TC_DIAG_STORM_ID = AL092022
 TC_DIAG_BASIN = AL
+TC_DIAG_BASIN_LOWER = al
 TC_DIAG_CYCLONE = 09
 
 TC_DIAG_INIT_INCLUDE = {init?fmt=%Y%m%d%H}