diff --git a/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/cesm_tci.py b/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/cesm_tci.py
index 0c568ae53..5b69bcd69 100644
--- a/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/cesm_tci.py
+++ b/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/cesm_tci.py
@@ -53,7 +53,7 @@
 
 # Add a Pandas date range to subset by season
 time_units, reference_date = ds.time.attrs['units'].split('since')
-if not time_units.strip() in ['D','days','Days','DAYS']:
+if time_units.strip() not in ['D','days','Days','DAYS']:
   print("ERROR: TIME UNITS EXPECTED TO BE DAYS IN tci_from_cesm.py")
   sys.exit(1)
 else:
diff --git a/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/fluxnet2015_tci.py b/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/fluxnet2015_tci.py
index c81a8c3c0..23e1c696c 100644
--- a/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/fluxnet2015_tci.py
+++ b/parm/use_cases/model_applications/land_surface/PointStat_fcstCESM_obsFLUXNET2015_TCI/fluxnet2015_tci.py
@@ -195,7 +195,7 @@ def get_season_start_end(s,refdate):
     print("NUMBER OF DAYS AFTER FILTERING AT THIS SITE: %04d" % (alldays))
 
   # Double check there's any valid data here
-  if not len(df) > 0:
+  if len(df) <= 0:
     if DEBUG:
       print("WARNING! NO DATA LEFT AFTER QC FILTERING.")
     metdf.loc[metdf['sid']==stn,'qc'] = '-9999'
@@ -219,7 +219,7 @@ def get_season_start_end(s,refdate):
     print("TOTAL DAYS FOR %s AT THIS SITE: %04d" % (season,len(df)))
   
   # Double check there's any valid data here
-  if not len(df) > 0:
+  if len(df) <= 0:
     if DEBUG:
       print("WARNING! NO DATA FOR REQUESTED SEASON.")
     metdf.loc[metdf['sid']==stn,'qc'] = '-9999'